Last Known Eruption
4d 12h 31m ago

Latest Eruptions

Eruption DurationInterval
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
21 Jun 2018 @ 1338:1013m 55s 2h 37m
21 Jun 2018 @ 1101 ie3m
21 Jun 2018 @ 1057:3414m 4d 20h 5m
16 Jun 2018 @ 14526d 1h 22m
10 Jun 2018 @ 133014m 50s 2h 50m
10 Jun 2018 @ 1040 ns~15m 17h 59m
09 Jun 2018 @ 164114m 2d 5h 19m
07 Jun 2018 @ 1122 ie20h 47m
06 Jun 2018 @ 1435 ie2h 22m
06 Jun 2018 @ 12131d 20h 59m
04 Jun 2018 @ 151411m 1h 44m
04 Jun 2018 @ 1330 ie1h 49m
04 Jun 2018 @ 11411h 1m21h 30m
03 Jun 2018 @ 14119m 34s 1h 20m
03 Jun 2018 @ 12519m 12s 1h 33m
03 Jun 2018 @ 111810m 39s 5d 21h 51m
28 May 2018 @ 13279m 1h 28m
28 May 2018 @ 11599m 5d 23h 17m
22 May 2018 @ 12429m 9d 21h 45m
12 May 2018 @ 1457 ns9m 1h 26m
12 May 2018 @ 13319m 6s 1h 9m
12 May 2018 @ 12228m 39s 1h 21m
12 May 2018 @ 11019m 26s 2h 45m
12 May 2018 @ 08169m 4s 3d 12h 17m
08 May 2018 @ 1959 ie1d 5h 47m
07 May 2018 @ 14125m 32s 1h 0m
07 May 2018 @ 13124m 56s 1h 8m
07 May 2018 @ 12046m 1h 1m
07 May 2018 @ 11035m 2d 16h 6m
04 May 2018 @ 18571m 30s 18m
04 May 2018 @ 18392m 47m
04 May 2018 @ 17524m 5s 15m
04 May 2018 @ 173749m
04 May 2018 @ 1648 ie1d 20h 36m
02 May 2018 @ 20125m 41s 1h 6m
02 May 2018 @ 19066m 37s 1h 0m
02 May 2018 @ 18066m 20s 6d 4h 0m
26 Apr 2018 @ 140659m
26 Apr 2018 @ 13073m 11m
26 Apr 2018 @ 125612m
26 Apr 2018 @ 124414m
26 Apr 2018 @ 123035m
26 Apr 2018 @ 115518m
26 Apr 2018 @ 113722m
26 Apr 2018 @ 1115~2m 8m
26 Apr 2018 @ 11071d 17h 36m
24 Apr 2018 @ 17311m 52s 11m
24 Apr 2018 @ 1720~1m 30s 13m
24 Apr 2018 @ 17071m 1s 1h 52m
24 Apr 2018 @ 1515 ie4m 13m
24 Apr 2018 @ 1502 ie14m
24 Apr 2018 @ 14481m 8s 10m
24 Apr 2018 @ 143857s 13m
24 Apr 2018 @ 142559s 20m
24 Apr 2018 @ 140539m
24 Apr 2018 @ 13263m 51s 11m
24 Apr 2018 @ 13151m 7s 1h 50m
24 Apr 2018 @ 1125 ns4m 9s 28m
24 Apr 2018 @ 10571m 24s 52m
24 Apr 2018 @ 1005 ns4m 14s 177d 50m
29 Oct 2017 @ 0915 ie20h 12m
28 Oct 2017 @ 130321m 4d 21h 7m
23 Oct 2017 @ 1556 ie41d 23h 46m
11 Sep 2017 @ 161020m 3d 23h 18m
07 Sep 2017 @ 165219m 4h 21m
07 Sep 2017 @ 123120m 20h 12m
06 Sep 2017 @ 161916m 4h 53m
06 Sep 2017 @ 1126 nsended at 114520h 16m
05 Sep 2017 @ 1510 ns3h 45m
05 Sep 2017 @ 1125 ie20h 27m
04 Sep 2017 @ 145819m 20h 37m
03 Sep 2017 @ 1821 ns~20m 4h 23m
03 Sep 2017 @ 135820m 20s 22h 36m
02 Sep 2017 @ 1522 ns2h 18m
02 Sep 2017 @ 13044d 1h 31m
29 Aug 2017 @ 1133 ie4d 20h 11m
24 Aug 2017 @ 152219m 4h 12m
24 Aug 2017 @ 111018m 2d 55m
22 Aug 2017 @ 1015 ie18h 42m
21 Aug 2017 @ 1533 ns17m 4h 48m
21 Aug 2017 @ 104519m 15h 27m
20 Aug 2017 @ 1918 ns18m 4h 32m
20 Aug 2017 @ 1446 ie> 14 m22h 50m
19 Aug 2017 @ 155616m 2d 7m
17 Aug 2017 @ 154914m 4d 19h 38m
12 Aug 2017 @ 2011>8m3h 7m
12 Aug 2017 @ 170414m 6d 23h 54m
05 Aug 2017 @ 17109m 51s 3d 1m
02 Aug 2017 @ 17096m 3s 1h 45m
02 Aug 2017 @ 1524 ns~8m 1h 15m
02 Aug 2017 @ 14095m 8s 1h 24m
02 Aug 2017 @ 12456m 57s 1h 27m
02 Aug 2017 @ 11185m 54s 31m
02 Aug 2017 @ 10471m 27s 1h 21m
02 Aug 2017 @ 09267m 1s 2d 14h 26m

Interval Statistics

Interval Count100
Min3m
Max177d 50m
Mean3d 11h 11m
Median2h 47m

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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