Last Known Eruption
108d 5h 49m ago

Interval Statistics

Interval Count19
Min1m
Max23y 4d 19h 25m
Mean1y 153d 3h 38m
Median3d 2h 24m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
12370 05 Jul 2019 @ 1754 --- minissa Low agitated pool, water spurting vigorously diagonally across pool to a height of about a foot from crack-like vent on right side of pool. Wasn't sure if this was the eruption or just a vigorous refill, so listing it as a note
11576 03 Jun 2019 @ 1752 --- JSJ Low pool. Angled, gurgling splashing from southern vent. Two peripheral/side vents quiet.
8420 02 Jun 2018 @ 1013 --- JSJ Very low water, but visible. Down ~1 meter from "normal" level. Auxiliary vents quiet.
6493 16 Sep 2017 @ 0714 --- TSBryan Activity about the same as seen yesterday, except perhaps less vigor in Gemini.
6403 15 Sep 2017 @ 1120 --- TSBryan Pebble water level down 2 inches, adjacent vent quiet, Gemini spitting from high vent formed steaming puddle.
6404 15 Sep 2017 @ 1100 --- TSBryan Pebble bubbling (not boiling), small vent just north of Pebble noisily sputtering water to several inches, patch nearer road sizzling, and Gemini gurgling and intermittently gushing steam.
4181 02 Jun 2017 @ 1519 --- JSJ Pebble Geyser had a decent water level. Basin floor is gray. Water was clear and hot (188° Fahrenheit - thermal camera reading). Occasional surging from southern part of vent.
3814 26 Oct 2016 @ 1730 --- DanS Minor splashing from South vent but much less energy than during AM.
3248 07 Jul 2016 @ 2020 07 Jul 2016 @ 2115 JSJ Pebble Geyser at moderately low pool level with clearish-gray water. Splashing (with brief pauses) from southern vent. Occasional splashing from eastern vent. Hissing from northeastern auxiliary vent. Gentle passive steaming from western auxiliary vent.
1886 11 Jul 2015 @ 1919 11 Jul 2015 @ 1929 JSJ Pebble Geyser started overflow from a full pool/basin at 1919. The overflow reached the dropoff toward Cave Spring by 1923. Runoff reached Cave Spring at 1927. Overflow reduced to a trickle by 1928. Overflow ceased at 1929 and pool level slowly decreased. A Gemini Geyser series followed.
1883 10 Jul 2015 @ 1828 10 Jul 2015 @ 2115 JSJ Pebble Geyser at high water level at 1828, with both auxiliary vents submerged. Overflow to Cave Spring at 1958. Overflow at a trickle by 2033. Almost no overflow at 2040. Decent overflow resumed at 2043. Still overflowing into Cave Spring at 2115 when I left. No Gemini series observed.
1875 09 Jul 2015 @ 1519 09 Jul 2015 @ 1915 JSJ Pebble Geyser's pool level slowly increased from 1519 to 1800. Overflow into Cave Spring at 1803. Overflow ceased at 1815 as pool level decreased. Adjacent Gemini Geyser started an eruption series at 1820.
1370 05 Aug 2007 @ 0900 --- BoekelUpload 9:00 not in overflow
1369 04 Aug 2007 @ 0000 04 Aug 2007 @ 2359 BoekelUpload in overflow
1368 27 Jul 2007 @ 0000 27 Jul 2007 @ 2359 BoekelUpload in overflow; Crack marker in place
1367 19 Jul 2007 @ 0000 19 Jul 2007 @ 2359 BoekelUpload in overflow; Crack marker replaced
1366 16 Jul 2007 @ 0000 16 Jul 2007 @ 2359 BoekelUpload in overflow; Crack marker in place
12342 29 Oct 1993 @ 1300 --- JarnoO in Lower Basin; is empty
No attachments for this geyser.
Baseline does not exist.


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