Last Known Eruption
2d 2h 44m ago

Latest Eruptions

Eruption DurationInterval
07 Dec 2024 @ 1638 wc1m
07 Dec 2024 @ 1637 wc3d 5h 58m
04 Dec 2024 @ 1039 wc5d 1h 0m
29 Nov 2024 @ 0939 wc1m
29 Nov 2024 @ 0938 wc3d 23h 21m
25 Nov 2024 @ 1017 wc12m
25 Nov 2024 @ 1005 wc22h 26m
24 Nov 2024 @ 1139 wc2d 3h 32m
22 Nov 2024 @ 0807 wc1m
22 Nov 2024 @ 0806 wc1d 23h 18m
20 Nov 2024 @ 0848 wc1m
20 Nov 2024 @ 0847 wc2d 18h 54m
17 Nov 2024 @ 1353 wc21h 38m
16 Nov 2024 @ 1615 wc1m
16 Nov 2024 @ 1614 wc4d 8h 12m
12 Nov 2024 @ 0802 wc1m
12 Nov 2024 @ 0801 wc16h 39m
11 Nov 2024 @ 1522 wc3h 47m
11 Nov 2024 @ 1135 wc3m
11 Nov 2024 @ 1132 wc1h 8m
11 Nov 2024 @ 1024 wc3m
11 Nov 2024 @ 1021 wc1m
11 Nov 2024 @ 1020 wc1m
11 Nov 2024 @ 1019 wc2m
11 Nov 2024 @ 1017 wc1m
11 Nov 2024 @ 1016 wc14d 23h 5m
27 Oct 2024 @ 12116s 1m
27 Oct 2024 @ 12101d 53m
26 Oct 2024 @ 1117 wc19h 30m
25 Oct 2024 @ 15471m
25 Oct 2024 @ 15462m
25 Oct 2024 @ 15441m
25 Oct 2024 @ 15432d 5h 12m
23 Oct 2024 @ 10311m
23 Oct 2024 @ 10303d 19m
20 Oct 2024 @ 10113m
20 Oct 2024 @ 10083m
20 Oct 2024 @ 10052m
20 Oct 2024 @ 10031m
20 Oct 2024 @ 100217h 35m
19 Oct 2024 @ 1627 wc5h 39m
19 Oct 2024 @ 10481m
19 Oct 2024 @ 10472m
19 Oct 2024 @ 10451m
19 Oct 2024 @ 10442m
19 Oct 2024 @ 104218m
19 Oct 2024 @ 10242m
19 Oct 2024 @ 10221m
19 Oct 2024 @ 10212m
19 Oct 2024 @ 10191m
19 Oct 2024 @ 10182m
19 Oct 2024 @ 101616h 13m
18 Oct 2024 @ 1803 wc4s 1m
18 Oct 2024 @ 1802 wc2s 2m
18 Oct 2024 @ 1800 wc2s 2d 1h 26m
16 Oct 2024 @ 1634 wc1h 1m
16 Oct 2024 @ 1533 wc17m
16 Oct 2024 @ 1516 wc3s 21h 15m
15 Oct 2024 @ 1801 wc2m
15 Oct 2024 @ 1759 wc2m
15 Oct 2024 @ 1757 wc1d 5h 27m
14 Oct 2024 @ 1230 wc3m
14 Oct 2024 @ 1227 wc19h 40m
13 Oct 2024 @ 16475h 26m
13 Oct 2024 @ 11211m
13 Oct 2024 @ 11201m
13 Oct 2024 @ 11191m
13 Oct 2024 @ 11182d 1m
11 Oct 2024 @ 1117 wc1m
11 Oct 2024 @ 1116 wc1d 18h 44m
09 Oct 2024 @ 1632 wc3s 1m
09 Oct 2024 @ 1631 wc3s 1m
09 Oct 2024 @ 1630 wc4s 1m
09 Oct 2024 @ 1629 wc3s 8h 31m
09 Oct 2024 @ 0758 wc2m
09 Oct 2024 @ 0756 wc14h 58m
08 Oct 2024 @ 1658 wc5s 2m
08 Oct 2024 @ 1656 wc4s 1m
08 Oct 2024 @ 1655 wc6s 8h 27m
08 Oct 2024 @ 0828 wc2m
08 Oct 2024 @ 0826 wc30m
08 Oct 2024 @ 0756 wc15h 49m
07 Oct 2024 @ 1607 wc2m
07 Oct 2024 @ 1605 wc1m
07 Oct 2024 @ 1604 wc6h 50m
07 Oct 2024 @ 0914 wc1d 18h 38m
05 Oct 2024 @ 1436 wc1m
05 Oct 2024 @ 1435 wc1h 10m
05 Oct 2024 @ 1325 wc1m
05 Oct 2024 @ 1324 wc23h 59m
04 Oct 2024 @ 1325 wc14m
04 Oct 2024 @ 1311 wc48m
04 Oct 2024 @ 1223 wc1h 33m
04 Oct 2024 @ 1050 wc1m
04 Oct 2024 @ 1049 wc1m
04 Oct 2024 @ 1048 wc2d 1h 49m
02 Oct 2024 @ 0859 wc4s 20h 4m
01 Oct 2024 @ 1255 wc1d 31m
30 Sep 2024 @ 12244h 56m
30 Sep 2024 @ 0728 wc2m

Interval Statistics

Interval Count100
Min1m
Max14d 23h 5m
Mean16h 25m
Median3m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
37635 19 Oct 2024 @ 1037 19 Oct 2024 @ 1042 DanS Erupting about every 1.5 mins, then paused 1037-1042 with no eruption.
37150 25 Sep 2024 @ 1208 25 Sep 2024 @ 1316 Graham Frequent eruptions, but shortly after each of the (3) Three Crater eruptions, there was a longer interval, as if Little Brother skipped an eruption. Longer intervals didn't occur at other times.
36927 12 Sep 2024 @ 1209 --- Micah Kipple 1209:12 - little blip to 4 inches without erupting.
36926 12 Sep 2024 @ 1206 --- Micah Kipple 1206:03 - Roiled up to about 8 inches but didn't erupt.
36436 17 Aug 2024 @ 1705 17 Aug 2024 @ 1736 minissa Have been watching as noted with eruptions every 2-3 minutes but LB has been draining bit by bit till pool between eruptions is barely visible from road. Eruptions are forceful and 10-15 feet high, though brief.
35525 24 Jun 2024 @ 1533 24 Jun 2024 @ 1547 steve I believe all the intervals recorded over this time span were closed intervals.
35157 12 Jun 2024 @ 1733 --- JSJ Brief, low surging / doming over vent area.
35156 12 Jun 2024 @ 1652 --- JSJ Brief pool bouncing and roiling over vent area.
35135 12 Jun 2024 @ 0623 --- CraigC There were 2 eruptions within 0623, could only enter the first one for the that time
34979 07 Jun 2024 @ 1508 07 Jun 2024 @ 1614 JSJ Closed intervals (some 1 minute intervals are hidden by GT in this listing). Only one Three Crater eruption during this time.
34896 04 Jun 2024 @ 1554 04 Jun 2024 @ 1728 JSJ All closed intervals (there's a hidden 1m interval in the GT postings). Erratic intervals, ranging from 1 minute to 18 minutes. All durations 2 to 3 seconds.
34902 04 Jun 2024 @ 1657 --- JSJ Two very low, brief surges / boils. Not enough to call it an eruption.
28363 20 Sep 2023 @ 1232 --- DanS Blipping for a few seconds
27425 05 Aug 2023 @ 1748 05 Aug 2023 @ 1911 JSJ No eruptions. Inactive.
26544 13 Jun 2023 @ 1520 --- Siegmund I watched 4 consecutive eruptions. Each was followed by 1 or 2 bursts from Three Crater a few seconds after Little Brother stopped. Some of these were quite large and vertical, as big as Little Brother itself. Little Brother remained active later today and the next 3 days but I never again saw Three Crater acting in concert with it.
25817 27 May 2023 @ 1545 --- TSBryan erupting every 1 to 3.5 minutes, durations usually less than 5 seconds
23620 07 Sep 2022 @ 1317 --- Graham Last entry on GT is Aug 15. Area around its crater is dry. Likely dormant now?
22410 08 Jul 2022 @ 1830 08 Jul 2022 @ 1904 minissa Noticed a tiny sput in the catch basin /berm {ie pool of standing water within the berm} of LB. Eruption is all of 2 inches and is difficult to see without binoculars but seems to be a tiny perpetual spouter. Didn't know if it had been noticed before.
21393 20 May 2022 @ 1942 --- BillJ Several brief eruptions around this time; intervals typically `1 minute but couldn't get exact times.
21382 20 May 2022 @ 0830 20 May 2022 @ 1013 Micah Kipple Little Brother is erupting 5-10 feet high every 30-70 seconds (with outliers on both sides) . Preliminary observations and timing this morning suggests that it likes to slow down after an eruption of 3 crater. Detailed eruption entries and further observations to follow.
21060 23 Apr 2022 @ 1705 23 Apr 2022 @ 1735 DanS Little Brother continues to erupt every minute or two.
21002 18 Apr 2022 @ 1739 --- steve Little Brother appears to be erupting about once a minute. GT tends to assume the second eruption is a secondary report of the eruption a minute earlier.
20989 16 Apr 2022 @ 1514 16 Apr 2022 @ 1519 steve Little Brother appears to be erupting once to twice a minute to 6-10 feet. So far all I have seen are single bursts.
20777 02 Feb 2022 @ 1022 --- Art-P erupting every 1 1/2 to 2 minutes
20747 22 Jan 2022 @ 1315 --- K.Cooper Continuing eruptions every minute, same size.
20746 22 Jan 2022 @ 0958 --- K.Cooper Continuing to erupt roughly every minute to two minutes. Roughly the same size as yesterday.
20743 21 Jan 2022 @ 1426 21 Jan 2022 @ 1442 aferrara Continued eruptions around once per minute. More frequent when Three Crater tries to start.
20741 21 Jan 2022 @ 1359 --- aferrara Tiny splash
11007 20 Apr 2019 @ 1427 --- Micah Kipple Dormant. Crater filled with orange bacteria.
EntrySourceLinkComment
12 Jun 2024 @ 1755 JSJ https://www.youtube.com/watch?v=7hrrZc8Q69c Video (clip 2 to the end) of Little Brother Geyser eruptions on 12 June 2024.
13 Jun 2023 @ 1547 JSJ https://www.youtube.com/watch?v=7461p2mMlG8 Video of Little Brother Geyser eruptions in the afternoon of 13 June 2023.
Baseline does not exist.