Last Known Eruption
98d 2h 12m ago

Interval Statistics

Interval Count100
Min8m
Max8y 224d 9h 24m
Mean35d 9h 17m
Median13m
Initial-to-Initial
Interval Count2
Min3d 5m
Max9d 19h 25m
Mean6d 9h 45m
Median6d 9h 45m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
40511 20 Jul 2025 @ 1250 --- Tara still having cyclic splashing to ~1' in righthand vent about twice a minute, basin full of water, lefthand vent not doing much.
39816 12 Jun 2025 @ 1603 --- mhreed Erupting out of one vent
39288 23 May 2025 @ 0618 --- LynnS Right vent splashing
39286 22 May 2025 @ 1050 22 May 2025 @ 1120 LynnS Intermittent splashing from the right (south) vent 4-12 inches high; some water pooled around both vents but no signs of runoff.
39205 21 May 2025 @ 1844 --- LynnS Right vent splashing water 8-10 inches high, water pooling around the vent
38647 26 Apr 2025 @ 1623 26 Apr 2025 @ 1635 DanS Trying to erupt. A few small splashes from South and one from North. Gurgling and Glugging. Short steam phase ends cycle.
38626 25 Apr 2025 @ 1645 --- DanS Gurgling and glugging. No splashes seen during several stopovers today. Whole area surrounding seems lower energy than earlier this week.
38610 24 Apr 2025 @ 1855 --- DanS Just one small splash in 5 minutes.
38579 22 Apr 2025 @ 1830 --- DanS Still trying to erupt, with a few splashes but platform dry.
38566 21 Apr 2025 @ 1740 21 Apr 2025 @ 1805 DanS Trying to erupt; a few small splashes from gurgling South vent plus a couple splashes from glugging North vent but no water leaving craters.
38552 20 Apr 2025 @ 1304 20 Apr 2025 @ 1358 DanS Gurgling and steaming but no water seen.
37632 18 Oct 2024 @ 1639 --- DanS Gurgling at depth
37131 24 Sep 2024 @ 0828 --- TSBryan forceful steam from both vents for about 2 minutes
36687 01 Sep 2024 @ 1628 --- SantaFe108 Splashing lazily at depth. During one of Pebble's small "eruptions", splashing became violent and loud, but still not visible, and only lasting ~10s.
36253 03 Aug 2024 @ 1904 --- SantaFe108 Gurgling at depth, platform dry.
35454 22 Jun 2024 @ 1128 --- nails Formation dry, gurgling
34524 11 May 2024 @ 1357 --- DanS Gurgling and puffing steam. Can hear water splashing in South vent, but not being ejected. Platform dry.
34508 10 May 2024 @ 1446 --- DanS Platform dry. Gurgling at depth and puffs of steam but no water being ejected. Same at 1607.
34464 05 May 2024 @ 1755 --- SantaFe108 Gurgling loudly, area surrounding vents bone dry.
28350 19 Sep 2023 @ 1530 --- DanS Gurgling at depth.
27510 10 Aug 2023 @ 1745 --- JSJ Subterranean gurgling. Very light steaming from both vents.
25839 28 May 2023 @ 0718 --- TSBryan puffs of steam from both vents but the surrounding flowers are blooming
24454 21 Oct 2022 @ 1034 --- DanS Both vents gurgling
24455 21 Oct 2022 @ 1034 --- DanS Both vents gurgling
24219 04 Oct 2022 @ 1116 --- DanS Bubbling and steaming from both vents
20130 26 Oct 2021 @ 1040 --- DanS Gurgling and steam pushes from both vents.
17294 30 May 2021 @ 1210 --- JSJ Flowers growing in basin. Moderately soft burbling with occasional louder gurgling.
16218 21 Sep 2020 @ 1002 --- DanS Burbling at depth.
14458 31 May 2020 @ 0835 --- DanS Dry with flowers growing in it
11575 03 Jun 2019 @ 1751 --- JSJ Flowers growing in Gemini's basin. Subterranean gurgling.
10355 16 Sep 2018 @ 1246 --- Siegmund Bone dry.
6400 15 Sep 2017 @ 1145 --- TSBryan Burst of water 1 to 2 feet high from high vent.
6402 15 Sep 2017 @ 1120 --- TSBryan "Trying" to erupt. See Pebble Geyser notes.
5290 23 Aug 2017 @ 1131 --- imapayne gurgling and some spitting above the rim.
4258 07 Jun 2017 @ 2056 --- JSJ Gemini has visible, low, intermittent splashing/low spouting from BOTH vents - not kidding. This happened for about 0.5m from 2056 to 2057.
4184 02 Jun 2017 @ 1809 --- JSJ Gemini Geyser's basin was bone dry. Southeastern vent was damp/wet, with constant subterranean gurgling. Occasional visible very low spouting from southeastern vent.
3815 26 Oct 2016 @ 1100 --- DanS Noisy but no surface water.
3249 07 Jul 2016 @ 2020 07 Jul 2016 @ 2115 JSJ Subterranean gurgling from the southeastern vent.
2938 01 Jun 2016 @ 2040 01 Jun 2016 @ 2129 JSJ Subterranean gurgling. Pool and runoff channel dry.
2505 10 Oct 2015 @ 1207 10 Oct 2015 @ 1615 Siegmund Gemini empty and the formation bone dry every time I drove past today.
2131 16 Aug 2015 @ 1800 16 Aug 2015 @ 2028 JSJ Gemini crashes/drains from 1800 to 2028.
2140 15 Aug 2015 @ 1937 15 Aug 2015 @ 2040 JSJ Seven Gemini crashes/drains from 1937 to 2040 - at 1937, 1948, 1959, 2010, 2025, 2032, and 2040.
2119 14 Aug 2015 @ 0059 --- JSJ Crash/drain at 0059.
2118 14 Aug 2015 @ 0045 --- JSJ Crash/drain at 0045.
2117 13 Aug 2015 @ 2223 13 Aug 2015 @ 2248 JSJ Crash/drain between 2223 and 2248.
2116 13 Aug 2015 @ 2159 13 Aug 2015 @ 2222 JSJ Crashes/drains from 2159 to 2222.
2114 13 Aug 2015 @ 2133 --- JSJ Crash/drain at 2133.
2108 12 Aug 2015 @ 2219 12 Aug 2015 @ 2232 JSJ Two Gemini Geyser crashes/drains - at 2219 & 2232.
2105 12 Aug 2015 @ 1931 12 Aug 2015 @ 2033 JSJ Gemini Geyser crashes/drains from 1931 to 2033.
2095 12 Aug 2015 @ 0015 --- JSJ Gemini Geyser crash/drain at 0015.
2094 11 Aug 2015 @ 2342 --- JSJ Gemini Geyser crash/drain at 2342.
2093 11 Aug 2015 @ 2300 11 Aug 2015 @ 2310 JSJ Two Gemini Geyser crashes/drains - at 2300 and 2310.
2092 11 Aug 2015 @ 2207 --- JSJ Gemini Geyser crash/drain from a below-half filled pool & bouncing northwestern vent.
2091 11 Aug 2015 @ 2130 11 Aug 2015 @ 2146 JSJ Three Gemini Geyser crashes/drains at 2130, 2136, and 2146.
2090 11 Aug 2015 @ 1949 11 Aug 2015 @ 2040 JSJ Four Gemini Geyser crashes/drains between 1949 & 2040. Directly observed crashes at 2005, 2016, and ~~2030. Was another crash between 1949 & 2005.
2075 09 Aug 2015 @ 2128 09 Aug 2015 @ 2150 JSJ Gemini crashes/drains at 2128 & before 2150, when an eruption occurred.
2064 08 Aug 2015 @ 2058 --- JSJ Crash/drain from a Gemini Geyser full pool & both vents in very low spouting.
2063 08 Aug 2015 @ 2040 --- JSJ Crash/drain from a Gemini Geyser full pool & both vents in very low spouting.
2061 08 Aug 2015 @ 1857 08 Aug 2015 @ 1931 JSJ Crashes/drains from a Gemini Geyser full pool & both vents in very low spouting at 1857, 1907, 1919, and 1931.
2477 08 Aug 2015 @ 1557 08 Aug 2015 @ 1715 JSJ Gemini crash/drain events noticed at 1557, 1639, and 1715.
2053 08 Aug 2015 @ 1202 08 Aug 2015 @ 1236 JSJ Four Gemini Geyser crashes/drains from full pool & both vents in very low spouting at 1202, 1212, 1224, and 1236.
2048 07 Aug 2015 @ 2220 07 Aug 2015 @ 2243 JSJ Gemini crashes/drains at 2220 & 2231 & 2243.
2047 07 Aug 2015 @ 2156 --- JSJ Gemini crash/drain at 2156.
2046 07 Aug 2015 @ 2118 --- JSJ Gemini crash/drain at 2118.
2045 07 Aug 2015 @ 2107 --- JSJ Gemini crash/drain at 2107.
2036 06 Aug 2015 @ 2054 --- JSJ Crash/drain at 2054 between the 4th and 5th eruptions of a Gemini series from 2008 to 2106.
1918 14 Jul 2015 @ 0820 14 Jul 2015 @ 1345 LynnS I left Gemini at 0820 and did not return until 1345, so did not have it under observation during this time.
1852 06 Jul 2015 @ 1836 06 Jul 2015 @ 1914 JSJ Gemini Geyser engaged in preplay & basin filling, but drained instead of erupting - observed at 1836 & 1900 & 1914.
1826 02 Jul 2015 @ 1326 --- Graham Gemini drained 1326, had a series during Fountains eruption, Pebble was high before Fountain and low afterwards.
1659 28 May 2015 @ 1845 28 May 2015 @ 2238 LynnS I left Gemini at 1640 after the series that started at 1531 ended. When I returned at 1845 Pebble's water level was above the west crack, but still below the orange rock we have been using to measure water levels. The height of Pebble's water indicated Gemini had not erupted while I was gone. Over the next hour Pebble's water level slowly rose until it went into overflow at 1948. When I left t 22:38 Gemini had still not yet erupted.
1640 25 May 2015 @ 2035 --- Gilbert Great double rainbow arched over Gemini when it finished its series
1194 02 Sep 2014 @ 2220 --- Micah Kipple Evil vent was erulting when i drove by @ 2220ish however pebble spring was still full so perhaps i just missed another series
1798 14 Sep 2010 @ 0000 --- LynnS I saw one Gemini series on 9/14 with intervals of 8-10 minutes.
1797 01 Sep 2010 @ 0000 --- LynnS Gemini was active at about 0630
1796 31 Aug 2010 @ 1200 --- LynnS Gemini was active around noon.
1795 08 Aug 2010 @ 0000 --- LynnS Steve Eide saw Gemini erupt on 8/8/2010
1794 07 Aug 2010 @ 0000 --- LynnS Steve Eide saw Gemini on 8/7.
1793 02 Aug 2010 @ 0000 --- LynnS Jim Scheir caught a series of Gemini on 8/2/2010
1807 29 May 2010 @ 1150 29 May 2010 @ 1207 LynnS Gemini's "right" vent was active 1153-1158, 1200-1203, 1204-1205, 1206-1207
15249 27 Jun 1996 @ 0000 27 Jun 1996 @ 2359 JarnoO active
15225 27 May 1996 @ 0000 27 May 1996 @ 2359 JarnoO active
EntrySourceLinkComment
16 Aug 2015 @ 2107 JSJ https://www.flickr.com/photos/jsjgeology/21877465478 Photo (1 of 2) of Gemini Geyser's 9:07 to 9:09 PM eruption on 16 August 2015.
12 Aug 2015 @ 2146 JSJ https://www.flickr.com/photos/jsjgeology/22075260941 Photo (1 of 2) of Gemini Geyser's 9:46 to 9:48 PM eruption on 12 August 2015.
08 Aug 2015 @ 1848 JSJ https://www.flickr.com/photos/jsjgeology/21442161734 Photo (1 of 7) of Gemini Geyser's 6:48 to 6:49 PM eruption on 8 August 2015.
08 Aug 2015 @ 1725 JSJ https://www.flickr.com/photos/jsjgeology/22038747286 Photo (1 of 2) of Gemini Geyser's 5:25 to 5:26 PM eruption on 8 August 2015.
08 Aug 2015 @ 1150 JSJ https://www.flickr.com/photos/jsjgeology/21442081484 Photo (1 of 11) of Gemini Geyser's 11:59 to 11:51 AM eruption on 8 August 2015.
08 Aug 2015 @ 1127 JSJ https://www.flickr.com/photos/jsjgeology/22052373902 Photo (1 of 5) of Gemini Geyser's 11:27 to 11:29 AM eruption on 8 August 2015.
11 Jul 2015 @ 1952 JSJ https://www.flickr.com/photos/jsjgeology/21181474945 Photo (1 of 9) of Gemini Geyser's 7:52 to 7:53 PM eruption on 11 July 2015.
09 Jul 2015 @ 1848 JSJ https://www.flickr.com/photos/jsjgeology/20646080688 Photo (1 of 5) of Gemini Geyser's 6:48 to 6:49 PM eruption on 9 July 2015.
09 Jul 2015 @ 1838 JSJ https://www.flickr.com/photos/jsjgeology/20827532725 Photo (1 of 7) of Gemini Geyser's 6:38 to 6:39 PM eruption on 9 July 2015.
06 Jul 2015 @ 1823 JSJ https://www.flickr.com/photos/jsjgeology/19824233380 Photo (1 of 14) of Gemini Geyser's 6:23 to 6:24 PM eruption on 6 July 2015.
13 Aug 2014 @ 2153 JSJ https://www.flickr.com/photos/jsjgeology/15428408631 Photo (1 of 3) of Gemini Geyser's 9:53 to 9:54 PM eruption on 13 August 2014.
03 Jul 1992 @ 1835 JSJ https://www.youtube.com/watch?v=xjjlBEF62OQ Video of Gemini Geyser's 6:35 to 6:36 PM eruption on 3 July 1992.
Baseline does not exist.