Last Known Eruption
26y 14d 23h 19m ago

Latest Eruptions

Eruption DurationInterval
07 Jul 1993 @ 0904186d 20h 15m
01 Jan 1993 @ 114980d 18h 43m
12 Oct 1992 @ 180650m
12 Oct 1992 @ 171610d 5h 55m
02 Oct 1992 @ 112111m 19h 51m
01 Oct 1992 @ 1530125d 5h 0m
29 May 1992 @ 10301y 256d 19h 4m
15 Sep 1990 @ 15261m 0s 20m
15 Sep 1990 @ 15061m 10s 22m
15 Sep 1990 @ 14441m 6s 3h 22m
15 Sep 1990 @ 112218h 16m
14 Sep 1990 @ 17061m 18s 24m
14 Sep 1990 @ 164258s 23m
14 Sep 1990 @ 161945s 2d 20h 34m
11 Sep 1990 @ 1945 min24m
11 Sep 1990 @ 19211m 10s 7h 31m
11 Sep 1990 @ 1150<1m 14m
11 Sep 1990 @ 1136<1m 36m
11 Sep 1990 @ 11004m 7d 18h 14m
03 Sep 1990 @ 1646 min13m
03 Sep 1990 @ 1633 maj2d 3h 28m
01 Sep 1990 @ 13052h 44m
01 Sep 1990 @ 10219d 52m
23 Aug 1990 @ 092917h 14m
22 Aug 1990 @ 16157d 5h 19m
15 Aug 1990 @ 105630s 1d 18h 28m
13 Aug 1990 @ 16282d 7h 13m
11 Aug 1990 @ 09157d 50m
04 Aug 1990 @ 08251m 0s 1d 16h 21m
02 Aug 1990 @ 1603:551m 5s 15m 0s
02 Aug 1990 @ 1548:551m 5s 14m 55s
02 Aug 1990 @ 1534:001m 5s 13m 55s
02 Aug 1990 @ 1520:051m 5s 11m 55s
02 Aug 1990 @ 1508:1040s 16m
02 Aug 1990 @ 145223m
02 Aug 1990 @ 14291d 18h 59m
31 Jul 1990 @ 1930 A1d 50m
30 Jul 1990 @ 18405h 40m
30 Jul 1990 @ 13002-3m2d 20h 22m
27 Jul 1990 @ 163818m
27 Jul 1990 @ 162026m
27 Jul 1990 @ 155424m
27 Jul 1990 @ 153021m
27 Jul 1990 @ 150917m
27 Jul 1990 @ 145217m
27 Jul 1990 @ 14351h 20m
27 Jul 1990 @ 131520m
27 Jul 1990 @ 12557d 23h 20m
19 Jul 1990 @ 13351h 22m
19 Jul 1990 @ 121320m
19 Jul 1990 @ 115317m
19 Jul 1990 @ 113616m
19 Jul 1990 @ 112017m
19 Jul 1990 @ 110319m
19 Jul 1990 @ 104422m
19 Jul 1990 @ 102211h 12m
18 Jul 1990 @ 231053s 27m
18 Jul 1990 @ 224357s 43m
18 Jul 1990 @ 220056s 22m
18 Jul 1990 @ 21381m 1s 5h 7m
18 Jul 1990 @ 163140s 1d 6h 11m
17 Jul 1990 @ 102022h 5m
16 Jul 1990 @ 1215 A10m
16 Jul 1990 @ 12051h 45m
16 Jul 1990 @ 1020<30s 9d 19h 25m
06 Jul 1990 @ 1455105d 23h 15m
22 Mar 1990 @ 1439:4550s 14m 5s
22 Mar 1990 @ 1425:4055s 17m 40s
22 Mar 1990 @ 1408:0050s 16m 0s
22 Mar 1990 @ 1352:0035s 21h 24m 0s
21 Mar 1990 @ 1628:0051s 14m 22s
21 Mar 1990 @ 1613:3850s 14m 27s
21 Mar 1990 @ 1559:1148s 1h 40m 26s
21 Mar 1990 @ 1418:4514m 25s
21 Mar 1990 @ 1404:2048s 14m 6s
21 Mar 1990 @ 1350:141m 43s 15m 0s
21 Mar 1990 @ 1335:141m 4s 14m 37s
21 Mar 1990 @ 1320:3758s 14m 6s
21 Mar 1990 @ 1306:311m 1s 15m 4s
21 Mar 1990 @ 1251:2756s 16m 20s
21 Mar 1990 @ 1235:071m 2s 15m 18s
21 Mar 1990 @ 1219:4959s 15m 20s
21 Mar 1990 @ 1204:2954s 14m 4s
21 Mar 1990 @ 1150:2554s 17m 21s
21 Mar 1990 @ 1133:0452s 10d 45m
11 Mar 1990 @ 1048~35s 18m
11 Mar 1990 @ 103058s 15m
11 Mar 1990 @ 1015<30s 13m
11 Mar 1990 @ 100259s 25m
11 Mar 1990 @ 093745s 2m
11 Mar 1990 @ 0935 min18m
11 Mar 1990 @ 09172m
11 Mar 1990 @ 0915 min21h 51m
10 Mar 1990 @ 1123:1517m 10s
10 Mar 1990 @ 1106:0521m 5s
10 Mar 1990 @ 1045:0020m 15s
10 Mar 1990 @ 1024:4523m 45s
10 Mar 1990 @ 1001:0024m 15s
10 Mar 1990 @ 0936:4521m
10 Mar 1990 @ 09157d 16h 43m

Interval Statistics

Interval Count100
Min2m
Max1y 256d 19h 4m
Mean12d 5h 26m
Median23m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
10366 17 Sep 2018 @ 0845 --- Siegmund Flooded. Pool full of milky water. No boiling. Adjacent UNNGs active.
8762 18 Jun 2018 @ 1019 --- JSJ No spouting, but noisy fumaroles in area.
4236 06 Jun 2017 @ 1145 06 Jun 2017 @ 1925 JSJ Incline Geyser was active from 10 vents, plus from a fracture zone next to the base of the hillside.
1175 07 Jul 2014 @ 0000 07 Jul 2014 @ 2359 JSJ In eruption - doing the perpetual spouting thing (it wasn't doing that in early June 2014 during my previous visit).  Five erupting vents observed.
1196 02 Jun 2014 @ 1200 02 Jun 2014 @ 1800 JSJ None of Incline Geyser's vents is erupting - mostly bare whitish geyserite present.  Water levels in all vents (except one) not visible.  Visible low water level in one of the larger northern vents - observed in the late afternoon on 2 June 2014.
7044 12 Oct 1992 @ 1630 --- JarnoO just ended
4706 11 Mar 1990 @ 1200 --- research-mab 3/11/1990 Our new geyser has actually expanded a crater that was about 10 x 13’ last summer. We saw frequent small eruptions from it (just within its crater). It seems that about 5 minutes before an eruption now there are light splashes and the steam vent near it increase in activity
4705 10 Mar 1990 @ 1200 --- research-mab 3/10/1990 ...erupts obliquely to the east (about 60º), height 60-80’. A second vent erupts to the west about 15’ high. The eastern jet is eroding the hillside away and washing sinter gravels (2-3”) into the geyser’s vent. Duration is 35-45 seconds. whittlesey
10934 23 Feb 1990 @ 1200 --- research-mab 2/231990 {no time given} Activity 1st seen by Arden Bailey
4698 02 Jul 1988 @ 1800 --- research-mab 7/2/1988 INCLINE In Porcelain Springs terrace area - there is a large area submerged now that drains into the big hole exploded in 1983 (?) Also the eruption doesn’t occur from the hole, but rather from several vents on the south side.
4689 24 May 1987 @ 1800 --- research-mab 5/24/1987 NOTE INCLINE Constant had a 2 burst eruption today. Whirligig erupted once, Splutter pot often. The “Blowout” Geyser is erupting, and has a number of new companions.
7681 26 Jun 1986 @ 1800 --- research-mab 6-26-1986 Unnamed 1983 Outbreak in SE corner of Porcelain Basin. Sinter slab & fragments in vent are stained black to very dark maroon & red. Vent is continuous spouter deflected by sinter sheet slab roof with opalescent blue water down ~1m. High frequency vibration of sinter sheet roof at north edge of crater. T=200º
7679 12 Feb 1986 @ 1100 --- research-mab 02/12/1986 Ruptured sinter sheet, SE corner of Porcelain Basin. Occurred between 2-6 & 2-11-83. Center of vent (26’) 7.9m from base of slope of old roadway. Maximum height 3-6 meters. Water drains into collapse pit of 1972 basin-wide disturbance at base of slope about 12m to the SW. Maximum thickness of ruptured sinter is 12cm. Water is turbid dark gray. L 21 1/2” major rupture W 25’ 7.6m 33’8” 10-3m Vent 5’ 1.5m Vent to south end of 71 blow-out 20.7m Vent to drain at base of slope 50’ 15.2m
4840 03 Jul 1985 @ 1900 --- research-mab 7/3/1985 Each eruption was very short-lasting 15 to 30 seconds only. Since the eruption vent is still under the overlying rock so when it spouts the water is forced to the sides – some of the water comes up thru the nearby cracks to maybe 1 to 2 feet high. Most of the water though is shot across the blowout hole maybe 4 to 5 feet or so. You can see the water starting to erupt under the rock – 5 seconds or so before it comes up above the rock.
7629 11 Feb 1984 @ 1140 11 Feb 1984 @ 1211 research-mab 02/11/1984 Each eruption was a steamy heavy spray emerging from under the northeast ledge or rim which was ejected horizontally to the south for a distance of approximately 5 meters. A barely perceptible rise in water level of less than 5 cm with an increase in horizontal flow of superheated bubbles across the pools surface form the northeast rim was the only sign that the next play was imminent. Mid interval activity was continuous splashing 0.4-1.2m from the central east portion of the cloudy dark blue gray pool.
4670 22 Aug 1983 @ 1730 --- research-mab 8/22/1983 Blowout - The geyser constantly splashed from an empty pool until often before an eruption a noticeable build up of steam occurred. The normal splashing stopped soon after that and the pool began to fill rapidly from a long crack in the side of the crater, sort of like a waterfall. When the pool filled an eruption began from the crack with water being thrown violently out to the side and splashed out a few feet. After the eruption normal, but higher, upright splashing started again from the full pool and lessened in height to normal as the pool drained.
4672 17 Aug 1983 @ 1730 --- research-mab (more info than the raw times-mab) Log: New Geyser in Porcelain Basin (Blowout?) Started observing at 1345 (8/17) At this time it was continually spouting with bursts coming out at a sharp angle. 1408:15 – spouting stopped and “draining” sound was heard 1408:23 – a loud jet of steam came out 1409:30 – steam stopped and the pool filled to the top. 1409:51 – a “major” eruption began – the water erupted straight up higher than the normal spouting 1411- normal spouting began- no pause at the end of the major (blended together) Majors like the one described except there was no jet of steam (pool filled) 1459:15 d=~2m, 1520:06 d=~2m, 1550:10 d=~2m, 1618:01 d=~2m 1645:32 – jet of steam till 1649:28 Duration – 3m56sec Interval from last steam – 2h37m09s 1649:34 – major began 1659 major ended approx 10 min duration, interval 31m32s Start: 1719:17 end 1721 – d= approx 2min.
7675 10 Mar 1983 @ 1515 --- research-mab 03/10/1983 The area was left for a brief period between eruptions c and d, a minor eruption may have occurred during that time.
7674 10 Mar 1983 @ 1430 --- research-mab 3-10-83 Activity of new geyser outbreak which broke out early in the week of 2-06-83 is irregular with less (est 50-60%) discharge. In late February (2/25?) Snow Coach Driver & summer Mammoth seasonal naturalist Arden B reported durations of 68 & 75 seconds, less discharge & lower heights of play. Today’s activity is as follows: Time Duration Interval
7667 05 Mar 1983 @ 1100 05 Mar 1983 @ 1140 research-mab 03/05/1983 Incline ~ *Max height ~3 meters
4666 19 Feb 1983 @ 1100 --- research-mab 2/19/1983 (Discovered Feb 12 by Fred Hirschmann) Rick Hutchinson and I (Cheryl B) quickly came to see the new addition. At the time of the discovery it was erupting every 20-29 minutes (average of 24 minutes) & about 20 feet high. The amount of discharge was estimated at 3-4 gallons per second. It was like a wave on the beach. The discharge flows into a large depression that is ~2 yrs old right at the base of the hill. Fine new addition to the geysers there in Porc. A week later I was checking the new geyser & the changes were very noticeable. The interval had shortened & the crater more than doubled in size. Previously it was ~2’ in diameter but now it was crescent shaped & about 6-7’ long. The “dark part of the moon” was undermined & falling in. The area doesn’t look very stable at all.
No attachments for this geyser.
Baseline does not exist.


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