Last Known Eruption
308d 4h 39m ago

Latest Eruptions

Eruption DurationInterval
09 Jan 2018 @ 2055:44 E37d 6h 18m 46s
03 Dec 2017 @ 1436:58 E1h 44m 0s
03 Dec 2017 @ 1252:58 E1h 54m 0s
03 Dec 2017 @ 1058:58 E2h 4m 0s
03 Dec 2017 @ 0854:58 E1h 56m 0s
03 Dec 2017 @ 0658:58 E2h 14m 0s
03 Dec 2017 @ 0444:58 E2h 10m 0s
03 Dec 2017 @ 0234:58 E2h 0m 0s
03 Dec 2017 @ 0034:58 E2h 8m 0s
02 Dec 2017 @ 2226:58 E2h 6m 0s
02 Dec 2017 @ 2020:58 E2h 14m 0s
02 Dec 2017 @ 1806:58 E2h 10m 0s
02 Dec 2017 @ 1556:58 E2h 20m 0s
02 Dec 2017 @ 1336:58 E2h 20m 0s
02 Dec 2017 @ 1116:58 E2h 22m 0s
02 Dec 2017 @ 0854:58 E2h 20m 0s
02 Dec 2017 @ 0634:58 E2h 22m 0s
02 Dec 2017 @ 0412:58 E2h 14m 0s
02 Dec 2017 @ 0158:58 E2h 6m 0s
01 Dec 2017 @ 2352:58 E2h 8m 0s
01 Dec 2017 @ 2144:58 E2h 10m 0s
01 Dec 2017 @ 1934:58 E2h 0m 0s
01 Dec 2017 @ 1734:58 E2h 0m 0s
01 Dec 2017 @ 1534:58 E1h 42m 0s
01 Dec 2017 @ 1352:58 E2h 32m 0s
01 Dec 2017 @ 1120:58 E21d 4h 9m 26s
10 Nov 2017 @ 0711:32 E1h 48m 0s
10 Nov 2017 @ 0523:32 E1h 34m 0s
10 Nov 2017 @ 0349:32 E1h 40m 0s
10 Nov 2017 @ 0209:32 E1h 50m 0s
10 Nov 2017 @ 0019:32 E1h 48m 0s
09 Nov 2017 @ 2231:32 E1h 54m 0s
09 Nov 2017 @ 2037:32 E1h 50m 0s
09 Nov 2017 @ 1847:32 E1h 48m 0s
09 Nov 2017 @ 1659:32 E1h 58m 0s
09 Nov 2017 @ 1501:32 E1h 52m 0s
09 Nov 2017 @ 1309:32 E1h 54m 0s
09 Nov 2017 @ 1115:32 E1h 50m 0s
09 Nov 2017 @ 0925:32 E1h 54m 0s
09 Nov 2017 @ 0731:32 E1h 58m 0s
09 Nov 2017 @ 0533:32 E1h 58m 0s
09 Nov 2017 @ 0335:32 E2h 6m 0s
09 Nov 2017 @ 0129:32 E2h 4m 0s
08 Nov 2017 @ 2325:32 E2h 0m 0s
08 Nov 2017 @ 2125:32 E1h 56m 0s
08 Nov 2017 @ 1929:32 E1h 56m 0s
08 Nov 2017 @ 1733:32 E2h 4m 0s
08 Nov 2017 @ 1529:32 E2h 6m 0s
08 Nov 2017 @ 1323:32 E2h 8m 0s
08 Nov 2017 @ 1115:32 E2h 4m 0s
08 Nov 2017 @ 0911:32 E2h 16m 0s
08 Nov 2017 @ 0655:32 E2h 14m 0s
08 Nov 2017 @ 0441:32 E2h 12m 0s
08 Nov 2017 @ 0229:32 E2h 20m 0s
08 Nov 2017 @ 0009:32 E2h 21m 34s
07 Nov 2017 @ 2147:58 E2h 18m 0s
07 Nov 2017 @ 1929:58 E2h 18m 20s
07 Nov 2017 @ 1711:38 E2h 18m 0s
07 Nov 2017 @ 1453:38 E2h 20m 0s
07 Nov 2017 @ 1233:38 E2h 18m 0s
07 Nov 2017 @ 1015:38 E2h 38m 0s
07 Nov 2017 @ 0737:38 E2h 32m 0s
07 Nov 2017 @ 0505:38 E2h 30m 0s
07 Nov 2017 @ 0235:38 E2h 20m 0s
07 Nov 2017 @ 0015:38 E2h 22m 0s
06 Nov 2017 @ 2153:38 E2h 30m 0s
06 Nov 2017 @ 1923:38 E2h 22m 0s
06 Nov 2017 @ 1701:38 E2h 10m 0s
06 Nov 2017 @ 1451:38 E2h 14m 0s
06 Nov 2017 @ 1237:38 E2h 24m 0s
06 Nov 2017 @ 1013:38 E2h 22m 0s
06 Nov 2017 @ 0751:38 E2h 28m 0s
06 Nov 2017 @ 0523:38 E2h 20m 0s
06 Nov 2017 @ 0303:38 E5h 2m 0s
05 Nov 2017 @ 2201:38 E2h 42m 0s
05 Nov 2017 @ 1919:38 E2h 24m 0s
05 Nov 2017 @ 1655:38 E2h 44m 0s
05 Nov 2017 @ 1411:38 E2h 46m 0s
05 Nov 2017 @ 1125:38 E2h 44m 0s
05 Nov 2017 @ 0841:38 E2h 38m 0s
05 Nov 2017 @ 0603:38 E2h 50m 0s
05 Nov 2017 @ 0313:38 E2h 50m 0s
05 Nov 2017 @ 0123:38 E2h 52m 0s
04 Nov 2017 @ 2231:38 E2h 40m 0s
04 Nov 2017 @ 1951:38 E2h 38m 0s
04 Nov 2017 @ 1713:38 E2h 34m 0s
04 Nov 2017 @ 1439:38 E2h 40m 0s
04 Nov 2017 @ 1159:38 E2h 26m 0s
04 Nov 2017 @ 0933:38 E2h 32m 0s
04 Nov 2017 @ 0701:38 E2h 40m 0s
04 Nov 2017 @ 0421:38 E2h 46m 0s
04 Nov 2017 @ 0135:38 E2h 32m 0s
03 Nov 2017 @ 2303:38 E2h 32m 0s
03 Nov 2017 @ 2031:38 E2h 28m 0s
03 Nov 2017 @ 1803:38 E2h 30m 0s
03 Nov 2017 @ 1533:38 E2h 36m 0s
03 Nov 2017 @ 1257:38 E2h 42m 0s
03 Nov 2017 @ 1015:38 E2h 36m 0s
03 Nov 2017 @ 0739:38 E2h 32m 0s
03 Nov 2017 @ 0507:38 E2h 20m

Interval Statistics

Interval Count100
Min1h 34m
Max37d 6h 18m
Mean16h 16m
Median2h 18m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
10180 13 Sep 2018 @ 1234 --- cb Pool is in a mediocre overflow. Water is trickling over the terraces . Both vents have a mediocre boil about 8" in diameter and only reaching a few inches in height.
9870 25 Aug 2018 @ 0920 --- cb pool level is higher and has a nice overflow as opposed to 8/22 post Steamboat.
9835 22 Aug 2018 @ 1842 --- cb barely overflowing with many rocks and ridges exposed. a mediocre 2 vent boil.
9385 01 Aug 2018 @ 0941 --- MAB Two vents visibly active - strong SE vent boil. Did not go to upper platform to look at color or floating things.
9304 26 Jul 2018 @ 1530 --- MAB A sheet of something organic was seen floating sub-surface. As we looked at it and tried to discern if it was a trick of lighting, it moved and changed shape. Similar to the 'leather' seen in features elsewhere. maybe.
9046 06 Jul 2018 @ 1438 --- udo Appears the same before and after Steamboat with perhaps same amount of runoff. 2 vents have continuous doming boils.
9032 03 Jul 2018 @ 0700 --- DGInc Spike up to ~49°C around this time, followed by a drop to ~24°C. No subsequent spikes as of writing.
8882 21 Jun 2018 @ 0905 --- Polly A few inches down from lip. I can hear a varying boil.
8809 20 Jun 2018 @ 0930 --- mdschwarz Continuous doming boil over the vent for the few minutes I watched it, large enough to make splashing sounds
8795 19 Jun 2018 @ 1800 --- cb increased water level, overflow and boil.
7960 15 Mar 2018 @ 0557 --- DGInc Spiked on the fourteenth until at least this data download repetitively up to 50°C. 2018-03-14: @ 1517 to 50.1°C, dropped to 14.7°C; @ 2059 to 49.4, dropped to 15.2°C (had three distinctive spikes, @ 2055 to 44.2°C, the one mentioned earlier and @ 2107 to 26.6°C while temperature was dropping). 2018-03-15: @ 0239 to 43.3°C, dropped to 14.9°C; @ 0523 to 47.4°C followed by another one to 40.6°C, dropped to 13°C after the second spike.
7954 06 Mar 2018 @ 0458 --- DGInc Spiked three times since 0200 (@ 0204, 0404, 0428). 0204 reached 37.8°C and dropped to 23.8°C, 0404 reached 44.8°C and dropped to 8.1°C and 0428 reached 46.9°C and dropped to 17.3°C.
7952 04 Mar 2018 @ 0500 --- DGInc Over the past 28½ hours (2018-03-03 0030 - 2018-03-04 0500) Echinus spiked four times, namely @ 0056 (47°C), 0804 (48.1°C), 0958 (max 43.5°C), 1334 (48.9°C; preceded by a much smaller spike @ 1248, reaching 38°C, dropping afterwards to 27.1°C). In all cases, except @ 1248, temperature dropped to below 20°C. Lowest temperature reached was 13.6°C @ 0116. All times mentioned above, except where noted, are on the 3rd of March. Afterwards, Echinus did not spike as extreme as on the 3rd, but the lowest temperature reached before 0500 on the 4th of March and after 1358 on the 3rd of March (time of last temperature minimum), was 25.9°C @ 0450 on the 4th.
7946 19 Feb 2018 @ 0000 --- DGInc Spiked repeatedly from about 0300 on the 18th up to 50°C or more (122°F; averaging at about 45°C [113°F]), followed by drops to near 10°C (50°F). Spikes ocurred irregularly, 1 to 4 per three hours. About 19 spikes were recorded by the logger.
7939 05 Feb 2018 @ 2359 --- DGInc Two spikes today, one at appx. 1645, reaching ~42°C (~108°F) and one at appx. 1815, reaching ~48°C (~118°F). Both were followed by a drop to ~15°C (~59°F).
7876 25 Jan 2018 @ 2359 --- DGInc Four more spikes occurred. One around 0300-ish, the other three at approximately 1230, 1430 and 1515. All reached about 45-48°C (113-118°F) and all were followed by a drop to about 15°C (59°F).
7875 24 Jan 2018 @ 1830 --- DGInc A spike reaching about 50°C (122°F) occurred around this time. It was followed by a drop to about 10°C (50°F). No other spikes preceded and followed this spike.
7871 11 Jan 2018 @ 1030 --- DGInc No eruption-like spikes have been logged since the eruption on 9 January @ ~2100.
7870 09 Jan 2018 @ 2100 --- DGInc One eruption occured slightly before 2100. The eruption spike reached ~75°C (~167°F). It was preceded by a smaller spike, which reached ~48°C (~118°F). Both spikes were followed by a drop to around 10°C (50°F), the latter one stayed around that temperature for ~2 hours.
7860 17 Dec 2017 @ 0000 --- DGInc Spike near 16 December 2017 0000 reached ~57°C (~135°F), followed by a drop to ~10°C (~50°F). Spikes then occured irregularly, but generally two or three every three hours. These spikes reached ~45°C to ~50°C (~113°F to ~122°F) and all were followed by drops to between 10°C to 20°C (~50°F to ~68°F).
7857 03 Dec 2017 @ 1600 --- DGInc No eruption-like spikes since this time. Temperature fluctuating between mostly 30°C and 40°C (86°F and 104°F), only one single spike around 2030 the same day, reaching about 45°C (113°F).
7855 02 Dec 2017 @ 0001 --- Polly Echinus is back! See YVO graph @ https://volcanoes.usgs.gov/volcanoes/yellowstone/yellowstone_monitoring_34.html - (click on attachment below). Best guess from looking at other graphs (Steamboat etc) is that there had been a disturbance in the basin the past few weeks. An additional comment from my brother, Bob Partner, who has watched Norris graphs consistently for years: "The minors at Steamboat came back after the November 10-12 events but very different character from normal pattern. Disturbances don’t always take the same pattern at Steamboat. I think this was an ongoing disturbance or shift in energy not a classic “disturbance”. The Steamboat graph will tell the tale if it isn’t lost."
7820 12 Nov 2017 @ 0001 --- Polly Interestingly, this coincides with the regular cyclic dip in the Steamboat temperatures (shown on the YVO graph), as do the events seen at Echinus on October 31. This event at Echinus is much more extensive than the last one, though.
7819 12 Nov 2017 @ 0000 --- DGInc Temperature was fluctuating between 31°C and 37°C from about 0800 on the 11th and the download of around 0000 today. Only one spike between 1100 and 1130 yesterday, which reached at max ±46°C, followed by a drop to ±11°C.
7818 10 Nov 2017 @ 0900 --- DGInc Logger data shows that around this time two spikes occured - one just prior to 0900 and one basically at 0900. After the second spike, which reached at max ±50°C, temperature began fluctuating between ±30°C and ±40°C. This was still the case when logger data was downloaded around 1100.
7805 31 Oct 2017 @ 1020 31 Oct 2017 @ 1115 MAB Upon arrival Echinus had strong roils from BOTH vents, (Very strong from SE vent) similar in appearance to when it is dormant. Sure wonder what happened before that! Left for other things at 1115. HUGE false start @ 1257. Afternoon eruptions all had strong roils from SE vent which is more like the first ones seen 10/22 as opposed to the quick starts of late. Very interesting (freezing) day, glad I was there to see that.
7808 31 Oct 2017 @ 0700 --- DGInc Had a spike around 0600 MST/0700 MDT, which was followed by ~6 hours of temperature fluctuating between 30 and 40°C (86 - 104°F) concluded by another spike. Erupting activity continued after that.
7799 30 Oct 2017 @ 2359 --- DGInc Echinus appears to be erupting quite regularly since 18 or 19 October, sometimes preceded by false starts, but pratically all have had a short period of overflowing. YVO logger is apparently relatively far away from Echinus and thus overflowing is not or barely recorded.
7751 24 Oct 2017 @ 1100 24 Oct 2017 @ 1642 MAB Three eruptions seen - no false starts
7726 20 Oct 2017 @ 1641 20 Oct 2017 @ 1750 MAB Saw some steam at 1641 from Vixen (super windy day) - when I went to check refill/overflow level on my way out it was almost _exactly_ the same level at 1750 as it was at 1524. Another eruption between? Not filling up? Whatever, it was interesting and so good to see it empty again.
7702 08 Oct 2017 @ 0000 --- DGInc Echinus erupted around this time. 7-day graph shows a clear spike and long drop around 2300 on the 7th, but the graphs use MST, not MDT.
7052 23 Sep 2017 @ 2359 --- DGInc ~19 electronically recorded spikes today. Last note unless something changes - e.g. less spikes or possible eruption.
6993 22 Sep 2017 @ 2359 --- DGInc ~17 times quick temperature rises and drops today. Based on three E-times of Echinus minors and two E-times of Echinus 'normals', I think either heavy overflow followed by no or less overflow or minors.
6887 21 Sep 2017 @ 2359 --- DGInc Quick temperature rises and drops continue at a significantly reduced rate
6855 19 Sep 2017 @ 1200 19 Sep 2017 @ 2359 DGInc Echinus has had some quick temperature increases and quick decreases between ~1200 and ~2359. Disclaimer: This is based on logger data alone. It could very well be that these are logger malfunctions, but I thought I'd make a note of it anyway.
6139 09 Sep 2017 @ 0805 --- ypcaribou Pool has cleared up. Dark green in middle and oranges/reds near edges. Too much steam to see if there were bubbles. Pool overflowing as it has been.
3228 24 Jun 2016 @ 1032 --- David water translucent milky white blue; bubbles rising from near side (from high viewing platform), and periodically from opposite side (ca 11 oclock). see photo: https://www.flickr.com/photos/ujelang/28029700011/in/dateposted-public/
2411 23 Sep 2015 @ 1015 23 Sep 2015 @ 1110 billwarnock Water in Echinus is very clear and in overflow. Nice boiling from several places whcih periodically increases.
2364 15 Sep 2015 @ 1059 --- MAB Heavy roiling observed over 3 visits, various times of the day. At this point in the season with fewer observers around, if anyone takes a look, I would love to know if you see smooth convection, or the heavy boiling/roiling. I will note that much, but not bother to post specific hourly observations.
1126 26 May 2014 @ 0000 26 May 2014 @ 2359 Polly Water has cleared up from what I saw last year.  Much of the brown is gone from the pool.
4724 30 May 1999 @ 1730 30 May 1999 @ 1850 research-mab 05/30/1999 Echinus 530-650 pm: 5 “belchers” from a full, overflowing pool. Each “belch” was bigger than the previous. KT
5439 23 Aug 1998 @ 1800 --- research-mab 8/23/98 Echinus is bubbling heavily from the center (where it erupts at) around the prediction time. It’s not quite a “false start” but just heavily bubbling. It subsides then comes again and may do this a few times then there was a false start, then an eruption.,… strange!
4593 25 Aug 1995 @ 1650 --- MAB YA log: Echinus 08-25-1995 Log has a duration of 1h30min “under” 4:38 eruption, which did not have a duration. It could be 1648 or not – but the duration is worth noting
4691 01 Jun 1988 @ 1800 --- research-mab 6/1/1988 Rick H Echinus had 56 min eruption
4860 17 Jul 1985 @ 1800 --- research-mab 7/17/1985 Echinus erupted from very full pool this AM- “turtle rock” completely covered by water 10 min. Eruption at that time followed by 41 min interval +9m eruption.
4684 29 Aug 1984 @ 1800 --- research-mab 8/29/1984 Echinus has had a weird eruption! The pool was very full and the eruption lasted 7 minutes 30 seconds. - but maximum height was only about 20 feet at best, the pool was very milky. Porcelain Basin is very quiet .. Did not see fireball or arsenic at all today.
4681 28 Jun 1984 @ 0909 --- research-mab 6/28/84 Echinus acting strangely. Visitor reported a 55 minute eruption. I went down to check it out and it erupted from an empty pool for 4 minutes. Then continued to erupt underground. 20 minutes later another 4 minute eruption from an empty pool.
7630 11 Feb 1984 @ 1355 11 Feb 1984 @ 1722 research-mab 02/11/1984 This afternoon’s activity suggests that there may be a multi-eruption cycle. Obviously much more intervals & durations are needed – which I can’t provide with the short time available here.
4637 26 Jul 1981 @ 2000 --- research-mab 7/26/1981 Echinus’ interval has jumped from about 43 minutes to ~ 60-65 today. It also seems to be spraying the crowd more frequently and more vigorous. Here is some data from this P.M.
7868 21 Sep 1980 @ 1224 21 Sep 1980 @ 1232 research-mab For the record: - the handwritten Echinus Record 1980 has "9/21/1980 Echinus 1200 min, 1207 d=9m21s, 1224 min, 1232:45 d=9m22s (weak for 52s then whammoo)" - I believe they mislabeled 1424-1432 as in the noon hour- which made no sense with the 1200 and 1207. Note that the same "whamooo" comment from the logbook is on 1432. mab
4971 26 Jun 1980 @ 1800 --- research-mab 06/26/1980 Echinus spent the day alternating short and long eruptions.
5075 22 Sep 1979 @ 1800 --- research-mab 09/22/1979 Echinus pulled another long eruption early this afternoon. Glad to see that the disturbance did not curtail the spectacular displays. The water was very murky grey at the beginning of the eruption and probably indicated that Echinus had also been muddied by the disturbance. Pool level at the start seemed a few inches lower than the pool level at the beginning of previous long eruptions.
5052 01 Aug 1979 @ 1005 --- research-mab 08/01/1979 Missed eruptions of Echinus at ~1005 and ~1140
5031 12 Jul 1979 @ 0904 --- research-mab 07/12/1979 Echinus had the weakest eruption I have seen this summer at 0904. The highest bursts were only going 50 to 60 feet. The preboil was very heavy, but of a normal length of 7:38. Duration of eruption was 13:22 followed by a very slow drain of 3:30. The water only dropped 1 foot below the vent. As the pool drained, it “boiled” in two places: one was in front of the whirlpool site and the other was the preboil site.
5149 26 Jun 1979 @ 1800 --- research-mab 06/26/1979 {no times} Following the 73 minutes eruption, Echinus had a muddy rock throwing eruption from a completely empty pool which lasted exactly 3 minutes. Before the eruption, water could be heard in a pre-boil deep within the vent, but was not visible. The eruption commenced with perhaps 20 seconds of 5 to 20 foot sprays followed by powerful surging. Many bursts showered the crowd with water and fine pebbles. The drain was very quick – only 35 seconds and the pool was about 2 feet below normal eruption level with the drain started. As the water disappeared out of sight, three bursts of water came up 10 to 20 feet – scared the devil out of me as I was in the crater timing the drain. The crowd thought it great seeing me scurry out of the crater! Minor steam phase followed the drain. The interval from the previous long eruption was 118 minutes, with 45 minutes from the end of the long to the beginning of the short. Start 10:55 The next eruption was another wild one throwing at least 100 rocks in thick muddy water (thick for Echinus). The pre-boil was at least 22 minutes and on 3 separate occasions the boil moved from the side of the pool to the center without triggering an eruption. The eruption started with pool level down 4 feet; overflow occurred at 6m50s into the eruption. Duration was 8:35 with a drain of 1:30.
5148 19 Jun 1979 @ 1800 --- research-mab 06/19/1979 {no time} Echinus d= 78m30 sec splashed 6m45s, drain 1:15 Echinus eruption was weak and sluggish compared to previous other one hour eruptions. Many rocks thrown… Very much like eruptions of Echinus of [after] Steamboat went last year. It was not full.
7677 19 Jun 1979 @ 1800 --- research-mab 6/19/1979 A definite change in the behavior of Echinus Geyser has been noted by the Norris Naturalists since Steamboat played: one eruption was initiated from an empty crater, lasting only 4-5 minutes, & did not overflow. Intervals & durations in general seem to be shorter than before. FH described the eruptions as appearing “tired”: the number of bursts per minute was fewer.
5016 07 Jun 1979 @ 0945 --- research-mab 06/07/1979 The 9:45 eruption of Echinus was quite abnormal compared to last year. I arrived about 10 minutes prior to the eruption and found heavy boiling from the crack behind the main vents. The water level was only 1 ft above the vent mouth. While the boil continued, the water level rose 2 ft and the eruption started with the pool 3 to 5 ft below normal levels. The bursts were very powerful for the first couple of minutes – much like a Grand eruption. At least 13 rocks were thrown, water was a soupy white. Overflow occurred at 6:40 into the eruption and the eruption stopped at 8:15. Very little water flowed out of the system, but drainage was quick and complete -1:40 to drain
5017 07 Jun 1979 @ 0945 --- research-mab 06/07/1979 The 9:45 eruption of Echinus was quite abnormal compared to last year. I arrived about 10 minutes prior to the eruption and found heavy boiling from the crack behind the main vents. The water level was only 1 ft above the vent mouth. While the boil continued, the water level rose 2 ft and the eruption started with the pool 3 to 5 ft below normal levels. The bursts were very powerful for the first couple of minutes – much like a Grand eruption. At least 13 rocks were thrown, water was a soupy white. Overflow occurred at 6:40 into the eruption and the eruption stopped at 8:15. Very little water flowed out of the system, but drainage was quick and complete -1:40 to drain
6625 03 Jun 1979 @ 0920 --- research-mab June 3 1979 Echinus had another long eruption this morning. I started watching at 0920 but had no idea when Echinus began. Finally stopping at 1000. Pool drained rapidly with large whirlpool, then went into steam phase. During these long eruptions the water level is about 3” below the rim which means that the rate of overflow is less than during a “typical” eruption.
5006 25 May 1979 @ 1800 --- research-mab 05/25/1979 Echinus seems to be quite erratic; reports of eruptions as short as two minutes and as long as 69.
7576 10 Apr 1979 @ 1800 --- research-mab 04/10/79 Cistern T=90C Sampled. Water very clear. Echinus in eruption for >45 minutes while sampling Cistern. Water opaque dark gray. Water drained in approximately 30 seconds completely out of sight. Vent aligned with Steamboat with source under overhand to the west. Wood sample from sinter at depth of roughly 1 meter (38 in.). Pyrite deposits easily visible extending downward at depth of around 2m. {no specific time noted}
5373 14 Jul 1977 @ 1800 --- research-mab 07/14/1977 Echinus at 6:18 & 6:20 over past two days. Today it threw a small piece of itself out at a visitor. Small piece about the size of a quarter (with spine deposit)
5547 09 Jul 1976 @ 1800 --- research-mab 07/09/1976 Echinus back on overflow cycle.
5534 28 Jun 1976 @ 1800 --- research-mab 06/28/1976 Echinus eruptions short – 3:27 & 3:36, time between eruptions average (~70min), but it goes into heavy overflow before erupting.
5523 18 May 1976 @ 2000 --- research-mab 05/18/1976 Finally saw an eruption of Echinus after sundown tonight. Pool fills slowly, suspect it is on a long cycle. Eruption occurs about the time the turtle-back rock is covered preceded by little fanfare. Eruption fairly long, estimate around 4-5 minutes. Height unobservable due to steam.
5685 16 Sep 1975 @ 1800 --- research-mab 09/16/1975 Echinus pool just barely overflowing at time of eruptions.
5699 14 Sep 1975 @ 1800 --- research-mab 09/14/1975 Today there was no overflow (of Echinus) before eruption. Water level rose no higher than ~ 1-2 in below top of “turtle rock”. Eruptions followed immediately after point of increased boiling.
5646 21 Aug 1975 @ 1800 --- research-mab 08/21/1975 Water in Echinus a milky gray. Pool fills rapidly until 4” from full, begins a heavy boil and fills slowly for next 15 minutes before erupting.
5594 30 Jun 1975 @ 1800 --- research-mab 06/30/1975 Echinus {post earthquakes}: erupted less than 65 minutes since last eruption. Was quite spectacular, muddy. Noticed pool filling rapidly at end of draining phase. Emerald Spring- muddy, water level up
5806 06 Sep 1974 @ 1629 --- research-mab 09/06/1974 Echinus – The 1629 eruption – Interval was 95 minutes. Overflow began at about 75 minutes and was extremely heavy – it took only 2 minutes to reach the waterfall (north runoff) about 4 minutes to reach Tantalus Creek. The eruption lasted 5 ½ non-stop minutes and was easily the most spectacular I’ve ever seen with many 80-100’ bursts. Several rocks were expelled, water reached the benches 8 (!) times (and me once).
5729 16 Jul 1974 @ 1725 --- research-mab 07/16/1974 Echinus erupted at 1716 was huge. One burst at ~2m I estimated to be well over 100’, probably ~120’. Five other bursts were closer to 100’, and many, many, bursts were in excess of 60’. Duration of the eruption was 6 ½ min. The interval preceding it was 89 minutes with no overflow)
5725 14 Jul 1974 @ 0900 --- research-mab 07/14/1974 0900 Echinus had a strange eruption, the overflow lasted a full 21 min & during this time there was a very vigorous boiling & bubbling action- as it normally does when an eruption commences when the eruption did begin, it exploded into an immediate eruption- no foreplay. The initial bursts were the most impressive, which is normally not the case. Too- the eruption only lasted 2m45s .
6166 19 Sep 1973 @ 1107 --- research-mab 09/19/1973 Echinus had a strange eruption at 11:07. There was no bubbling until the rock was completely covered. Then the bubbling began it lasted exactly 5 min then the eruption started. It lasted 3m45s then stopped suddenly 2/ no isolated bursts afterward. Regular drainage – down 4-5’ in 3½ min, but the first part of the drainage was very slow (with no sound) and the second part was very fast.
6153 17 Sep 1973 @ 1800 --- research-mab 09/17/1973 Echinus in the last couple days has taken a pattern of long eruptions (~ 4 ½ min.) and long intervals between (66-67 min). The water fills the basin very slowly, steadily, quietly. In the last 5 min of water-filling, slowing increasing bubbling is noted & small waves across the pool are only in last few minutes. After 3 ½ min of the eruption, there is a quieting as of threatening to quit; then for another minute, burst still come but with not quite the force (&high) as the previous minutes. Draining still is down 4-5 ft. in depth.
6142 14 Sep 1973 @ 1800 --- research-mab 09/14/1973 Echinus continues tremendous eruption pattern of yesterday although not unbelievable in height the volume discharged during each burst is very large as well as the fact that burst are sent in more than one direction simultaneously height max 60-70’
6080 22 Aug 1973 @ 1800 --- research-mab 08/22/1973 Echinus eruptions showed more “normal” pattern without the prolonged low bubbling period in the first minute.
6068 20 Aug 1973 @ 1800 --- research-mab 08/20/1973 Echinus – still retains its low bubbling period in 1st min of the eruption; small rocks were seen expelled during one eruption – approx 2” dia.
6065 19 Aug 1973 @ 0932 19 Aug 1973 @ 1612 research-mab 08/19/1973 Echinus 1641: Showed similarity to 5:16 eruption yesterday; the 932 had moderate bursts for ~1min, then ~~25secs there was a lull stage of only 2 ft- bubbling; the rest of the 4 min eruption had only moderate bursts & lacked the forceful sound; the 1:58 & 4:12 eruptions had similar lull periods but were followed by a minute of high (60-70 ft) bursts – the last ~min and a half had only moderate or low bursts)
6058 18 Aug 1973 @ 1716 --- research-mab 08/18/1973 5:16 eruption of Echinus was high atypical. Eruption lasted 4 min. First 55 sec normal, then for 200 sec only 1-2ft bubbling, then remainder was normal, although nothing went above 40 ft.
6051 11 Aug 1973 @ 1800 --- research-mab 08/11/1973 Continued high eruptions at Echinus w/ milky water and SO2 being deposited in the channels.
6047 08 Aug 1973 @ 1800 --- research-mab 08/08/1973 Echinus eruptions have seemed to me to be rather subdued both yesterday & today.
6028 07 Jul 1973 @ 1800 --- research-mab 07/07/1973 Echinus very cloudy for about a week depositing silica -shooting higher than previous noted
6026 30 Jun 1973 @ 1000 30 Jun 1973 @ 1700 research-mab 06/30/1973 Echinus eruptions have been very unusual lately – Stan has reported seeing rocks thrown out, the water has seemed milkier than usual. Interval has been shorter – 10:00 eruption went before the “turtle rock” was covered.
5977 29 Apr 1973 @ 1800 --- research-mab 04/29/1973 Echinus- water is still turbid but has cleared slightly.
5974 25 Apr 1973 @ 1800 --- research-mab 04/25/1973 Echinus, for one eruption timed at d=3m41s {no time}
5992 23 Apr 1973 @ 1800 --- research-mab 04/23/1973 Echinus- water in pool is still a bluish-gray (more gray than blue) and is almost opaque
5970 20 Apr 1973 @ 1800 --- research-mab 04/20/1973 Echinus : water very turbid gray- almost to the point if being opaque. One eruption was observed and timed. Duration: 3m48s estimated max height 70 feet which occurred near the end of the eruption. Several times there seemed to be almost a pause in the activity and play would start in again. {No time listed}
6215 18 Apr 1973 @ 1600 --- research-mab 04/18/1973 Echinus – a big change was observed today: the water is now a very turbid gray (with a slight tinge of blue) In fact, when the pool is drained after an eruption, the water is almost opaque. In the runoff channels much fine-grained gray sand has been deposited. The change has also had an effect on Echinus’s eruptive behavior. In the 5 eruptions observed this afternoon all of them went off without recycling, started before the pool was completely full, i.e. before the dome-shaped rock on the north side was covered, had a shorter interval, and played for longer durations. An account of its activity is as follows: 1240 eruption began. There was virtually no boiling over vent (less than 10 seconds) before play began at a level approximately 2 inches below the dome-shaped rock. Estimated maximum height was near 70 feet. Duration: 3m45s Next eruption: rapid boiling began when the pool water level was a full 4 inches below the top of the dome-shaped rock at 1:20 pm. Pool became calm at 1:24 pm but still filling. Bubbling started approximately 10 seconds before beginning of the eruption when still 2 inches of the dome-rock were exposed. Eruption began at 1328 Measured maximum height 52 feet Duration: 3m46s Interval from previous eruption: 48 min Next eruption: as before, bubbling started when pool level was still 4 inches below dome rock at 2:09 pm Pool quiet at 2:11, gentle bubbling at 2:12 Vigorous bubbling started 7 seconds before beginning of eruption when about 2 inches of the dome rock were exposed. Eruption began at 2:17 Measured maximum height: 85 feet Duration: 3m45s Interval: 49 minutes Next eruption: much the same as before in the 2:17 eruption. Bubbling started 7 seconds before time of play when approximately 1 ½ inches below top of dome rock. Activity was witnessed by 18 visitors! Eruption: 3:06 pm Measured maximum height: 93 feet Duration: 3m50s Interval 49 minutes Next eruption: same as before except pool level rose to 1 inch below top of dome rock before playing and that bubbling preceded eruption by 13 seconds. Eruption: 3:55 pm Measured maximum height 76 feet Duration 3m41s Interval 49 minutes
5965 11 Apr 1973 @ 1212 11 Apr 1973 @ 1237 research-mab 04/11/1973 Echinus: one eruption was observed and timed. It was preceded by a pattern of activity which has not been seen before in at least the last three years. 12:12 (approx) moderate bubbling over Vent began 12:15 pool filled (dome shaped rock covered) 12:22 very vigorous bubbling as if eruption was going to start (1 min) 12:25 very vigorous bubbling , same as 1222, pool continued to have moderate bubbling in between 12:28 same “ “ “ 12:31 moderate bubbling ended, pool quite (recycled) duration up to now 19 mins 12:32 moderate bubbling over vent resumed, water started to flow into west aextension of pool for first time. 12:34 very vigorous boiling, same as 1222 12:37 Eruption of Echinus began. Duration: 3m31sec estimated maximum height: 80 feet. It now appears that Echinus has at least two types of recycles; one when water flows into the west extension of the pool, usually over flowing with vigorous bubbling over vent, followed by a quiet period over the vent and a drop in the water level of the pool by about 2 inches. The second type is described above in today’s observation a cycle of 1 minute of very vigorous bubbling every 3 minutes – sort of recycling within a recycle.
5963 09 Apr 1973 @ 1900 --- research-mab 04/09/1973 Echinus: Two consecutive durations and one interval was obtained this evening. Its behavior was as follows: 5:27 dome shaped rock covered (pool filled) 5:34 bubbling over vent began, lasting 3 min, pool recycled 5:40 bubbling over vent began, lasting 6 ½ min, until eruption 5:47 eruption began, duration 3min15s. Estimated maximum height was 60 feet. 5:50 pool required 4 minutes to drain 6:37 pool filled 6:46 bubbling, 3 min, pool recycled 6:52, bubbling, 3 min, until eruption 6:55 Eruption began, duration 3m6s. Estimated maximum height was between 70-89 feet, with many other tall bursts also 6:58 pool required 4 minutes to drain. The one timed interval between eruptions was 68 minutes ; then there was one recycle before both eruptions, starting 6 minutes before the activity which led up to the time of play.
6210 08 Apr 1973 @ 1950 --- research-mab 04/08/1973 Echinus: two consecutive intervals and durations were obtained. As has been suspected the eruptive pattern has changed significantly over what it had been for at least the past three seasons. Its behavior this evening was as follows. 5:20 pm eruption began 6:17 pool refilled 5:23 bubbling over vent (in middle of south side) began 6:26 pm second observed eruption began, played for 3 minutes, 5 seconds. Estimated maximum height was 75 feet which occurred approximately 15 seconds before the end of the eruption. 6:30 pm pool required 4 minutes to drain (observations temporarily suspended – between 6:34 & 7:25 pm) 7:25 pm bubbling over vent begins, lasting 3 min, pool recycled 7:36 pm Bubbling begins again, lasting 4 min, pool recycled 7:43 pm Bubbling began again, lasting 2 min, until eruption 7:45 pm Third eruption began, duration: 3 minutes even. (By this time it was too dark to estimate the maximum height or to time the draining of the pool.) Thus the two intervals were 66 and 79 minutes respectively; the two durations were 3 min6 sec and 3min0sec, respectively. Just for comparison (although only 2 eruptions may certainly not be representative of the current normal values), the average interval for the 1972 summer season was 46.0 minutes and the average duration was 3minutes 28 seconds, which was little different form the 1971 average of 47.5 min.
5914 11 Mar 1973 @ 1800 --- research-mab 03/11/1973 Echinus duration 2:20, est height 40 feet.{no time noted but no other eruptions seen on this day so though I would include this with D and ht-mab)
6455 07 Sep 1972 @ 1447 --- research-mab 09/07/1972 The 2:47 eruption of Echinus was unusual in that it was very short (2.5-3 min) and didn’t drain as much as usual. The rate of draining was very slow.
6452 03 Sep 1972 @ 1218 --- research-mab 09/03/1972 Echinus 12:18 eruption was unusual in that after 2½ minutes the pool stopped for a few seconds as if it had finished. Then it started up again with the highest burst of the eruption. Total eruption in excess of 4 min.
6420 21 Aug 1972 @ 1800 --- research-mab 08/21/1972 Echinus erupting with more vigor than before quake.
6478 05 Oct 1971 @ 1000 --- research-mab 10/05/1971 A reliable source reported an eruption of Echinus this morning to a height of only 25’ {generic morning time}
6530 10 Sep 1971 @ 1830 --- research-mab 09/10/1971 Echinus Geyser – no complete eruptions from beginning to end were observed today but we were there in time to see the draining phase from an eruption around 6:30 pm, and one important difference was noted: While it normally takes a little over 2 minutes for the pool to drain down to its lowest level, this time it took approximately 4 minutes. Water is also slightly more murky.
6587 05 Jun 1970 @ 1800 --- research-mab 06/05/1970 Echinus may be on a longer cycle this year; the average cycle was 60 min today. The times were reported by visitors, so may be off.
7486 15 Aug 1969 @ 1800 --- research-mab 08/15/1969 Echinus on a very regular short cycle.
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