Last Known Eruption
11d 10h 44m ago

Latest Eruptions

Eruption DurationInterval
04 Nov 2018 @ 091110m 12d 17h 22m
22 Oct 2018 @ 1648:1519m 52s 3d 35m 2s
19 Oct 2018 @ 1613:137m 2s 4h 18m 53s
19 Oct 2018 @ 1154:209m 20s 1h 28m 38s
19 Oct 2018 @ 1025:429m 11d 20h 46m
07 Oct 2018 @ 133912m 1h 35m
07 Oct 2018 @ 120410m 5s 1h 33m
07 Oct 2018 @ 10319m 36s 3d 22h 1m
03 Oct 2018 @ 1230 ie2d 20h 20m
30 Sep 2018 @ 1610 ie10m 1h 51m
30 Sep 2018 @ 14199m 35s 1h 15m
30 Sep 2018 @ 13046m 59s 1h 30m
30 Sep 2018 @ 113410m 5s 1h 32m
30 Sep 2018 @ 1001:469m 58s 6d 16h 55m
23 Sep 2018 @ 1706 ie5h 45m
23 Sep 2018 @ 112110m 1h 16m
23 Sep 2018 @ 10056m 1h 21m
23 Sep 2018 @ 0844 ie17h 26m
22 Sep 2018 @ 1517:405m 45s 1h 16m
22 Sep 2018 @ 14018m 2h 25m
22 Sep 2018 @ 11368m 20m
22 Sep 2018 @ 11162m 1h 1m
22 Sep 2018 @ 1015 ie4d 17h 54m
17 Sep 2018 @ 1621 ns5m 2h 40m
17 Sep 2018 @ 1341 ns5m 21m
17 Sep 2018 @ 13201m 7s 1d 19h 50m
15 Sep 2018 @ 17307m 1d 25m
14 Sep 2018 @ 1705 ns12m
14 Sep 2018 @ 165353m
14 Sep 2018 @ 1600 ie1h 23m
14 Sep 2018 @ 14371h 21m
14 Sep 2018 @ 13167m 43s 1h 16m
14 Sep 2018 @ 1200 ie19m
14 Sep 2018 @ 11411m 1h 4m
14 Sep 2018 @ 10378m 15m
14 Sep 2018 @ 1022 ns1m 30s 19h 32m
13 Sep 2018 @ 145017m 23h 55m
12 Sep 2018 @ 145515m 1h 26m
12 Sep 2018 @ 132911m 5h 16m
12 Sep 2018 @ 0813 ns5m 4d 15h 24m
07 Sep 2018 @ 16496m 1h 0m
07 Sep 2018 @ 1549 ns6m 2d 5h 29m
05 Sep 2018 @ 1020 ns23h 49m
04 Sep 2018 @ 10317m 4d 22h 52m
30 Aug 2018 @ 1139 ie17h 57m
29 Aug 2018 @ 1742 ie16m
29 Aug 2018 @ 1726 ns1h 1m
29 Aug 2018 @ 1625 ns1h 22m
29 Aug 2018 @ 1503 ns2h 51m
29 Aug 2018 @ 1212 ns16m
29 Aug 2018 @ 1156 ie1h 6m
29 Aug 2018 @ 1050 ns2d 19h 52m
26 Aug 2018 @ 14587m 18s 1h 24m
26 Aug 2018 @ 13349m 39s 1h 18m
26 Aug 2018 @ 12166m 4s 1h 19m
26 Aug 2018 @ 105711m 1d 19h 30m
24 Aug 2018 @ 1527 ie1h 24m
24 Aug 2018 @ 14031h 21m
24 Aug 2018 @ 12421h 37m
24 Aug 2018 @ 1105 ie1h 11m
24 Aug 2018 @ 0954 ie1d 16h 50m
22 Aug 2018 @ 17048m 1h 16m
22 Aug 2018 @ 154810m 1d 2h 38m
21 Aug 2018 @ 13107m 4h 3m
21 Aug 2018 @ 09078m 3d 17h 43m
17 Aug 2018 @ 1524 ie2d 1h 46m
15 Aug 2018 @ 1338 ie2h 49m
15 Aug 2018 @ 10497m 1d 22h 1m
13 Aug 2018 @ 124811m 1h 39m
13 Aug 2018 @ 110910m 19h 8m
12 Aug 2018 @ 1601 ns~7m 1h 38m
12 Aug 2018 @ 1423 ns~10m 1h 34m
12 Aug 2018 @ 124910m 4s 1h 39m
12 Aug 2018 @ 111010m 43s 20h 31m
11 Aug 2018 @ 143921h 3m
10 Aug 2018 @ 1735:55 ns1h 27m 10s
10 Aug 2018 @ 1608:459m 50s 4h 28m 0s
10 Aug 2018 @ 1140:4510m 5s 1h 31m 15s
10 Aug 2018 @ 1009:3010m 33s 17h 36m
09 Aug 2018 @ 1633 ie1h 42m
09 Aug 2018 @ 14519m 18s 1h 34m
09 Aug 2018 @ 131710m 1h 38m
09 Aug 2018 @ 113911m 17h 59m
08 Aug 2018 @ 17402h 5m
08 Aug 2018 @ 153513m 21s 1d 23h 45m
06 Aug 2018 @ 15501h 51m
06 Aug 2018 @ 135913m 1h 58m
06 Aug 2018 @ 1200:331h 55m 3s
06 Aug 2018 @ 1005:3012m 45s 2d 13h 3m
03 Aug 2018 @ 21022d 5h 6m
01 Aug 2018 @ 1556 ie5d 22h 8m
26 Jul 2018 @ 174822m 3h 53m
26 Jul 2018 @ 1355 ie4h 11m
26 Jul 2018 @ 0944 ie2d 16h 5m
23 Jul 2018 @ 173911d 8h 5m
12 Jul 2018 @ 0934 ie17d 22h 8m
24 Jun 2018 @ 112615m 58s 1d 17h 5m
22 Jun 2018 @ 1821 ns3h 9m
22 Jun 2018 @ 151215m 2h 36m
22 Jun 2018 @ 1236 ns~14m 22h 57m

Interval Statistics

Interval Count100
Min12m
Max17d 22h 8m
Mean1d 8h 36m
Median2h 30m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
8004 26 Apr 2018 @ 1127 --- Micah Kipple It's having very frequent splashing 10-20 cm but am only entering true jetting eruptions.
4171 31 May 2017 @ 1200 --- kc Arsenic was on and off all afternoon with durations ranging from 1 to 5 minutes.
3987 21 Apr 2017 @ 0956 21 Apr 2017 @ 1022 MAB Appears to start, but never reaches full height. Not closed intervals as it was very steamy and I was walking around the lower loop.
2398 21 Sep 2015 @ 0930 21 Sep 2015 @ 1410 MAB Burbling and looking pre-eruptive for 4 hours, no eruption seen. Same for the afternoon visit from 1641 - 1750
2380 18 Sep 2015 @ 0603 --- MAB I had a good handle on Arsenic pre-disturbance. It has skunked me the last 4 visits, sometimes burbling and looking quite pre-eruptive. Jake may have seen the last one for a while! I will start noting the burbles that are about 4" and see if they fit the interval pattern from earlier this month. I hope I am just unlucky and am missing them.
3756 15 Aug 2015 @ 0941 --- jh23487 Arsenic was either erupting or bubbling a little, not very tall. Possibly at the end of an eruption.
4696 02 Jul 1988 @ 1800 --- research-mab 7/2/1988 Also, Arsenic geyser is erupting this summer.
7638 26 Jun 1986 @ 1800 --- research-mab 6-26-1986 Arsenic Geyser – Active. Clear, full, boiling before eruption. T=201º
7604 11 Feb 1984 @ 1800 --- research-mab 2-11-84 Arsenic Geyser active.
5367 11 Aug 1983 @ 1800 --- research-mab 8/11/1983 Arsenic Fireball Splutterpot in simultaneous eruption {time unknown}
4643 14 Aug 1981 @ 1900 --- research-mab 8/14/1981 Arsenic Geyser is in perpetual spluttering as is Moxie and 2 other small spouters. Fireball is somewhat weak. GS
4644 14 Aug 1981 @ 1900 --- research-mab 8/14/1981 Arsenic Geyser is in perpetual spluttering as is Moxie and 2 other small spouters. Fireball is somewhat weak. GS
4645 14 Aug 1981 @ 1900 --- research-mab 8/14/1981 Arsenic Geyser is in perpetual spluttering as is Moxie and 2 other small spouters. Fireball is somewhat weak. GS
4615 22 Sep 1980 @ 1800 --- research-mab 9/22/1980 Arsenic Geyser – in a low eruption a good share of the day ie 204ºF
4762 22 Jul 1980 @ 1315 22 Jul 1980 @ 1330 research-mab 7/22/80 Porcelain 1:15-1:30 -Arsenic – constant, one to two feet
5133 01 Jun 1980 @ 1800 --- research-mab 06/01/1980 Arsenic was observed in two different eruptions to 5’. (no times)
4989 26 Sep 1979 @ 1800 --- research-mab 09/26/1979 Arsenic and Acute Spouter continue their small, perpetual eruptions. Ledge still puffing away with steam. ‘
5065 21 Sep 1979 @ 1800 --- research-mab 09/21/1979 Africa, Fireball, Arsenic and Geyser north of Constant all perpetual spouters. {probably Acute Spouter?-mab}
5060 15 Aug 1979 @ 1800 --- research-mab 08/15/1979 Five geysers erupted in concert today down in the Porcelain Basin Arsenic, Africa, Fireball, Little Wirlygig, and Constant. A new small geyser (sideways) erupted 1 foot today on the eastern side of Constant. {probably Acute spouter?- mab}
4967 01 Jul 1978 @ 1110 --- research-mab 07/01/1978 Good activity out of Porcelain this morning. Between 1000 am and 1110 am geysers in eruption included Fireball, Africa, Blue, Dark Cavern, Big Whirligig (twice), Constant (twice) and * Arsenic Geyser (10 min+). *Today was the first recorded observation of this geyser in eruption recorded this summer.
5116 19 Aug 1977 @ 1800 --- research-mab 08/19/1977 Arsenic splashing up to 15” high, much as it did for most of last year.
5239 07 Sep 1976 @ 1800 --- research-mab 09/07/1976 Arsenic – mainly steam
5271 28 Jul 1976 @ 0900 --- research-mab 07/28/1976 Ragged & Arsenic both active as usual at 9:00
5554 20 Jul 1976 @ 1800 --- research-mab 07/20/1976 Arsenic & Fireball continue their nearly constant type of activity, but the intensity of the activity varies.
5535 29 Jun 1976 @ 1540 29 Jun 1976 @ 1600 research-mab 06/29/1976 Arsenic, Moxie & Pinto erupting simultaneously from 3:40 -4:00
5863 28 Jun 1976 @ 1550 28 Jun 1976 @ 1610 research-mab Arsenic Geyser erupting constantly during above interval.
5836 21 Sep 1974 @ 1428 --- research-mab 09/21/1974 1428 Africa quits, now only Arsenic {noted as Geezer in log} is erupting (3’)
6203 26 Sep 1973 @ 1800 --- research-mab 09/26/1973 Temperatures taken yesterday Arsenic Geyser 200 – not erupting {included here since it’s not mentioned much this year-mab}
5925 17 Mar 1973 @ 0800 --- research-mab 03/17/1973 Arsenic was in its “steam phase” during all of this time.{written in morning section of log}
5912 12 Mar 1973 @ 1200 12 Mar 1973 @ 1815 research-mab 03/12/1973 Arsenic The water level was seen throughout the morning and early afternoon to be gradually rising in the vent. Accompanying the filling was continuous minor play with splashing originating at the northeastern end. During the afternoon the minor play became gradually more vigorous with water occasionally splashing out. At 1342 the last 3-4 inches to the top of the vent rapidly filled and was accompanied by the splashing changing into a series of fountain-like jets with massive overflow & runoff. After 9 minutes of play the water bursts became intermittent & more mixed with steam to end the true water phase. At 1445 the “steam phase” was still in progress with occasional bursts up to 2-3 feet, while at 1610 all play had ceased. A second phase of activity began sometime between 4:30 and 4:40, with the new “steam phase” beginning at approximately 4:45 and running to approximately 6:15.
5910 10 Mar 1973 @ 1635 --- research-mab 03/10/1973 At 4:35 Feisty, dark Cavern, Africa, Little Whirligig, Fireball, Blue, Arsenic, and Constant Geyser were all seen to be playing at the same time. (for 10-15 seconds due to the very short duration of Constant) Four playing together is not unusual but 8 is.
6489 11 Sep 1972 @ 1200 --- research-mab 09/11/1972 Bear Den, Dark Cavern, Africa. L. Whirligig, Blue, Fireball & Arsenic all have been observed in eruption this morning. {generic a.m. time}
6428 19 Aug 1972 @ 1800 --- research-mab 08/19/1972 Little Whirligig, arsenic, & Africa are still playing continuously. Ledge still has intermittent spray type minor play.
6398 15 Aug 1972 @ 1800 --- research-mab 08/15/1972 Arsenic – still in constant eruption, spraying water to a height of 5-7 feet.
6396 14 Aug 1972 @ 1800 --- research-mab 08/14/1972 L. Whirligig & Arsenic are still in continuous eruption.
6387 12 Aug 1972 @ 1800 --- research-mab 08/12/1972 Arsenic & Little Whirligig have not been observed to quit yet.
7866 09 Aug 1972 @ 0800 09 Aug 1972 @ 1800 research-mab 8/9/1972 Arsenic Geyser in constant 2-8’ eruption all day (before 8:00am to after 6:00 pm) normal 3-4 hours
6350 23 Jul 1972 @ 1400 --- research-mab 07/23/1972 At the end of the 1:30 walk there were 6 geysers in simultaneous eruption – Blue, Iris, Fireball, Arsenic, Africa and Little Whirligig.
6334 08 Jun 1972 @ 1548 --- research-mab 06/08/1972 Africa, Bear Den, Ledge, L. Whirligig, Arsenic and Possibly Blue (crossed out “Iris”) were all erupting at the same time at 3:48
6498 15 May 1972 @ 1800 --- research-mab 05/15/1972 Arsenic geyser – have not noticed an eruption 148º
7670 12 Aug 1970 @ 1800 --- research-mab 08/12/1970 Much activity in Porcelain in late pm (6-7) Arsenic, Fireball, and Fan went off in succession. 8/12/1970 Dark Cavern had extended eruption also.
7088 28 Jun 1966 @ 1800 --- research-mab 06/28/1966 Fireball & Arsenic both active this afternoon.
6797 24 Oct 1964 @ 1800 --- research-mab 10/24/1964 Arsenic is sloshing around but not erupting over the lip.
6775 17 Oct 1964 @ 1800 --- research-mab 10/17/1964 Fan {FIREBALL} & Arsenic are weak.
6772 16 Oct 1964 @ 1800 --- research-mab 10/16/1964 Fan {FIREBALL} & Arsenic are occasionally quiet & very weak.
6747 09 Oct 1964 @ 1800 --- research-mab 10/09/1964 The small geysers (Fan, Arsenic, Fireball {PINTO} etc) are still continuously active but are weak.
6710 05 Oct 1964 @ 1800 --- research-mab 10/05/1964 Porcelain Basin observed from 3:30 pm to 4:30 pm Arsenic & Fan are continuously active but weak.
6705 04 Oct 1964 @ 1800 --- research-mab 10/04/1964 Arsenic, Fan and Fireball {PINTO} are still steadily active.
6789 03 Oct 1964 @ 1800 --- research-mab 10/03/1964 The little geysers within the boardwalk loop (Arsenic, Fan {today’s FIREBALL}, Fireball {today’s PINTO}) have been continuously active all day.
EntrySourceLinkComment
09 Aug 2014 @ 1554 JSJ https://www.youtube.com/watch?v=2gpPvJbTC3g#t=1m47s Video clips (time stamp 1:47 to the end) of Arsenic Geyser's 3:54 to ~4:10 PM eruption on 9 August 2014.
07 Jul 2014 @ 1432 JSJ https://www.youtube.com/watch?v=2gpPvJbTC3g Video clips (beginning to time stamp 1:46) of Arsenic Geyser in eruption from 2:32 to ~2:45 PM on 7 July 2014.
Baseline does not exist.


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