Last Known Eruption
22d 12h 32m ago

Latest Eruptions

Eruption DurationInterval
27 Apr 2024 @ 1134223d 19h 24m
16 Sep 2023 @ 161047m 59m
16 Sep 2023 @ 1511~36m 27m
16 Sep 2023 @ 14447d 38m
09 Sep 2023 @ 140623m 51m
09 Sep 2023 @ 131529m 44d 2h 2m
27 Jul 2023 @ 111327m 1h 12m
27 Jul 2023 @ 100137m 6d 14h 50m
20 Jul 2023 @ 19116h 39m
20 Jul 2023 @ 123252m 1h 38m
20 Jul 2023 @ 105455m 48m
20 Jul 2023 @ 10061d 18h 57m
18 Jul 2023 @ 15091h 3m
18 Jul 2023 @ 140622h 51m
17 Jul 2023 @ 151518h 35m
16 Jul 2023 @ 20401h 5m
16 Jul 2023 @ 19351h 40m
16 Jul 2023 @ 1755 ie6h 36m
16 Jul 2023 @ 111915h 49m
15 Jul 2023 @ 19307h 10m
15 Jul 2023 @ 12201h 6m
15 Jul 2023 @ 111432m 39m
15 Jul 2023 @ 1035 ie1h 58m
15 Jul 2023 @ 0837 ie14h 42m
14 Jul 2023 @ 175522h 8m
13 Jul 2023 @ 19471d 4h 31m
12 Jul 2023 @ 15161h 3m 2d 4h 25m
10 Jul 2023 @ 105124m 13h 4m
09 Jul 2023 @ 21475d 9h 3m
04 Jul 2023 @ 12443h 14m
04 Jul 2023 @ 0930 ie1d 18h 42m
02 Jul 2023 @ 144853m 1h 48m
02 Jul 2023 @ 13001h 1m 1h 16m
02 Jul 2023 @ 11441d 13h 45m
30 Jun 2023 @ 21591d 14h 18m
29 Jun 2023 @ 074124m 1h 44m
29 Jun 2023 @ 055754m 22h 51m
28 Jun 2023 @ 070611m
28 Jun 2023 @ 065519m
28 Jun 2023 @ 063615h 33m
27 Jun 2023 @ 150321m
27 Jun 2023 @ 144217m 30m
27 Jun 2023 @ 141220m 37m
27 Jun 2023 @ 133524m 58m
27 Jun 2023 @ 123732m 48m
27 Jun 2023 @ 114923m 16m
27 Jun 2023 @ 11338m 21m
27 Jun 2023 @ 111217m 25m
27 Jun 2023 @ 104721m 1h 12m
27 Jun 2023 @ 093546m 37m
27 Jun 2023 @ 085815m 27m
27 Jun 2023 @ 083120m 46m
27 Jun 2023 @ 074542m
27 Jun 2023 @ 070325m
27 Jun 2023 @ 063840m
27 Jun 2023 @ 0558 ie11h 49m
26 Jun 2023 @ 180913m 27m
26 Jun 2023 @ 174218m 35m
26 Jun 2023 @ 170723m 7m
26 Jun 2023 @ 17002m 31m
26 Jun 2023 @ 162922m 1h 19m
26 Jun 2023 @ 151046m 53m
26 Jun 2023 @ 141726m 19m
26 Jun 2023 @ 135811m 28m
26 Jun 2023 @ 133021m 20m
26 Jun 2023 @ 131012m 13m
26 Jun 2023 @ 12579m 12m
26 Jun 2023 @ 12458m 58m
26 Jun 2023 @ 114734m 27m
26 Jun 2023 @ 112018m 26m
26 Jun 2023 @ 105419m 1h 16m
26 Jun 2023 @ 093843m 14h 36m
25 Jun 2023 @ 190229m
25 Jun 2023 @ 183317m
25 Jun 2023 @ 18163d 23h 52m
21 Jun 2023 @ 18241h 14m
21 Jun 2023 @ 171046m 53m
21 Jun 2023 @ 161725m 28m
21 Jun 2023 @ 15496m 37m
21 Jun 2023 @ 151228m 41m
21 Jun 2023 @ 143129m 2h 11m
21 Jun 2023 @ 12201h 12m
21 Jun 2023 @ 1108 ie1h 19m
21 Jun 2023 @ 094912m
21 Jun 2023 @ 09374m 17m
21 Jun 2023 @ 092012m 29m
21 Jun 2023 @ 085122m 44m
21 Jun 2023 @ 080730m 15h 22m
20 Jun 2023 @ 16451h 6m
20 Jun 2023 @ 15391h 14m
20 Jun 2023 @ 142546m
20 Jun 2023 @ 13391h 50m
20 Jun 2023 @ 11491h 3m 3d 21h 1m
16 Jun 2023 @ 144850m 7h 53m
16 Jun 2023 @ 065558m 13h 43m
15 Jun 2023 @ 1712 ie55m
15 Jun 2023 @ 16171h 29m
15 Jun 2023 @ 14481h 0m
15 Jun 2023 @ 13481h 33m
15 Jun 2023 @ 12155h 5m

Interval Statistics

Interval Count100
Min7m
Max223d 19h 24m
Mean3d 4h 7m
Median1h 6m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
27111 18 Jul 2023 @ 0858 18 Jul 2023 @ 1200 Brian Observed several regular cycles, no notable activity. On arrival, noted BV channel almost entirely dry, which ties in with the greatly reduced activity in BV/LM since the EC yesterday, very little pre- or during-cycle splashing, vs the consistently "happy" activity which had characterized most of the interval.
27105 17 Jul 2023 @ 2123 17 Jul 2023 @ 2215 Brian prior cycle wrapping up, everything off by 2130 RV 2158 GV 2203 AV 2208 water levels mediocre left unattended at 2215
27103 17 Jul 2023 @ 1630 17 Jul 2023 @ 1900 Brian 3 listless regular cycles, with very little pre-cycle or in-cycle water in Mortar, unlike that observed during the 1515 cycle.
27013 11 Jul 2023 @ 2121 --- deanl just wrapping up a regular cycle as I walked by
26997 10 Jul 2023 @ 1353 10 Jul 2023 @ 1903 Brian Observed 5 regular cycles over this period, all of which followed a similar and fairly well organized pattern: All off, BV/LM low water or spritz, a little MV steam, RV on, H/G at +3-5 min, AV at +5-8 min, water ok but not exciting in any way, then the usual slop until AV would remember to stop. Notably, it *did* quit at the end of each cycle. 4 out 5 cycles we got an RV cough just when it seemed everything was off, then finally a full stop. The quiet periods betwen cycles were generally short, only once more than 15 minutes.
26289 13 Jun 2023 @ 1236 13 Jun 2023 @ 1255 Polly 1236 R/H 1238 A 1239 R off A on briefly 1243 G, then A a few tiny blips 1247-49 a couple A blips 1250 A on 1255 R off. AC then off
26286 13 Jun 2023 @ 1121 13 Jun 2023 @ 1142 Polly 1121 R/H on 1125 H&G spurting 1-2 feet at first, then lower 1132 A H&G spurts 1-3 feet briefly Some light MV steam R off 1158 A Continues intermittently Before River came on, BV & LM had water and were alternating
19801 30 Sep 2021 @ 0832 --- Brian RV off now
18992 22 Aug 2021 @ 1258 22 Aug 2021 @ 1638 Polly Mostly quick cycles with little activity from Mortar vents. A often continued intermittently.
18584 22 Jul 2021 @ 1507 22 Jul 2021 @ 1713 Brian Cycle activity has been progressively less organized for the past two hours. We’ve had the semblance of two regular cycle starts, but each has degenerated into random splashing from Fan’s upper vents fairly quickly
17681 11 Jun 2021 @ 1614 11 Jun 2021 @ 1700 Polly 1614 RHGA ie, low levels. 1620 R off, AC (Angle continued), intermittent. 1624-1627 disorganized. AC 1628 R on then G & A. Low level cycle. R off 1651. 1657 R on & ANQ (Angle Never Quit).
13593 05 Sep 2019 @ 1605 05 Sep 2019 @ 1715 Polly R, H, A ie 1605. 1607 heavy MV steam, then lighter. 1615 heavy steam UM. 1620 R off, A Continued. 1622 copious MV steam, 25 UM audible steam. A off by 1630. Intermittent MV steam C. 1641 BV light spritz C, & tips of splashes visible LM, with improvement until R/H on 1651. A blips 1654 Continue & G on. H&G thick 1 - 2’ steady. H & G intermittent 1657, height decreasing. A on fully 1700. By 1704 occasional thin high spurts H&G. Left 1715. (BV channel damp ~2’ down.)
13594 05 Sep 2019 @ 1241 05 Sep 2019 @ 1328 Polly R off upon arrival, A & MV steam intermittent. 1249 A off. 1301 BV spritzing intermittently & improving. 1304 audible LM & UM. 1304 R/H , with A blips 1305. 1306 G on , H&G thick with some H spurts 2’. G&H thick at times. Subsided slowly & I left 1328.
12044 29 Jun 2019 @ 1552 29 Jun 2019 @ 1800 Polly On arrival, small puddle near Bottom Vent. Catch basins were dry. I watched portions of 3 mostly organized cycles, with intermittent moderate to heavy steam in Main Vent. Overall, water levels were moderate. Lower Mortar splashes were easily seen. Angle stayed on for a minute or 2 after River was off, then turned off. Cycle durations varied. There was a River Vent pause at 1618 (d=6m) but no splashing in Main Vent. (Some pushes of steam may have been from splashing at depth.) When River came back on, Angle started intermittent blipping right away on this cycle.
10037 04 Sep 2018 @ 0830 04 Sep 2018 @ 1952 c.barwin The first River to River began at 0904 and lasted 58 minutes. During this cycle, Angle did not turn off until 1 minute into the next River on which became an event cycle. The event cycle lasted 115 minutes, then the next cycle was 111 minutes, then 104, 119, and 116.
10017 03 Sep 2018 @ 0852 03 Sep 2018 @ 1826 c.barwin A day of 4 long cycles and one shortish one. In order of River on to River on starting at 0925... the first cycle was 80 minutes, then 94, 104, & 102. The one after the 102 was 61 minutes which was followed by a cycle with good water levels 35+ minutes after River on at 1732. Gold was on at 1734 and turned off at 1740 by forceful Main Vent steam. After copious MV steam with no water, Gold came back on two minutes later.. Throughout this cycle and the 61 minute one, MV steamed heavily.
9951 30 Aug 2018 @ 0830 30 Aug 2018 @ 1810 c.barwin I observed 5 normal cycles over a 9+ hour sit. The first cycle at 0845 was 112 minutes, then 71, 102, 104, & 93. Other than a couple of River coughs, the day was 'unEventful'.
9726 15 Aug 2018 @ 0824 15 Aug 2018 @ 1535 c.barwin observed 5 regular cycles during this time span.
9713 14 Aug 2018 @ 0825 14 Aug 2018 @ 1519 c.barwin observed 4 regular cycles during this time.
9689 12 Aug 2018 @ 1704 12 Aug 2018 @ 1931 minissa 2 regular cycles with High and Gold turning on not long after River and Angle within 2 minutes of that. Initial water levels pretty good. First cycle was 27 min, 2nd was 40 with some spritzing from Bottom and eventual steam put out by Frying Pan and I think Frying Pan 2 (small steam aperture inside back arm of Lower Mortar
7698 26 Sep 2017 @ 1226 26 Sep 2017 @ 1315 Polly River already off upon arrival. 1227-29 intermittent A splashes. Mortar mostly quiet 1226-1245. 1238 heavy MV steam. 1245 finally a few light fuzz balls BV and then at 48 some in LM. By 1256 thicker splashes BV & LM with MV huff. R on 1257, G 1258, A 1259. Thick water levels (H ~ 1') but bottoming out often.
7697 26 Sep 2017 @ 1043 26 Sep 2017 @ 1057 Polly 1043 BV light spritz; by 1049 BV spritz hitting top of rock. 10:49 R/H on; G on 1052. Pause 1053. 1054 R back on; G lightly on 1057.
6552 16 Sep 2017 @ 1329 16 Sep 2017 @ 1540 RLJones The series of very short cycles returned with 7 cycles ocurring during the 2h 11m of observation. Never was water viewed in MV nor was there any pooling or splashes in BV or LV. HV never exceeded 2 ft. AV was very frequent during entire observation. The short cycles were still in process when left.
6495 16 Sep 2017 @ 1057 16 Sep 2017 @ 1150 Polly Longer cycle with better water levels in Bottom Vent, High, & Gold.
7749 15 Sep 2017 @ 1610 15 Sep 2017 @ 1910 Tara Disorganized short garbage cycles with River off no longer than about 5 minutes at a time.
6360 13 Sep 2017 @ 1354 13 Sep 2017 @ 1409 Polly Last cycle River to River was 15 m. When River turned off at 1404, Angle actually stayed off.
6359 13 Sep 2017 @ 1135 13 Sep 2017 @ 1354 Polly Angle has played much of the day. Cycles have each been over an hour except the last one which was 45 minutes.
2865 21 May 2016 @ 0615 --- JimS Angle on 0631.
2849 15 May 2016 @ 0907 --- RLJones NO eruption yet. Having an organized cycle right now.
7800 06 Sep 2004 @ 1220 06 Sep 2004 @ 1306 Tara Disorganized garbage, Angle constant and River off for only 1-2 minutes at a time.
14319 05 Jun 1995 @ 1231 05 Jun 1995 @ 1243 JarnoO jetting from Angle Vent (weak) @ 1231; River Vent off 1239-1243
EntrySourceLinkComment
08 Aug 2017 @ 1830 JSJ https://www.youtube.com/watch?v=HuQxsKHf1rc#t=0m52s Time lapse video of 2 regular cycles of Fan & Mortar Geysers. The 6:30 to 7:43 PM regular cycle starts at time stamp 0:52 in the video.
08 Aug 2017 @ 1713 JSJ https://www.youtube.com/watch?v=HuQxsKHf1rc Time lapse video of 2 regular cycles of Fan & Mortar Geysers. The 5:13 to 6:05 PM regular cycle starts at time stamp 0:01 in the video.
Baseline does not exist.