| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 40820 |
05 Aug 2025 @ 1525 |
05 Aug 2025 @ 1557 |
JSJ |
48 eruptions in 32 minutes. Same behavior as yesterday (see note from one day ago). Most individual minutes had one or two or three eruptions. After the end of a Three Crater Geyser eruption, Little Brother would slow down. Watched one slowdown during this time - the slowdown lasted 8 minutes, consistent with yesterday's slowdowns. During individual minutes in the slowdown, Little Brother had no eruptions or one eruption. |
| 40804 |
04 Aug 2025 @ 1516 |
04 Aug 2025 @ 1848 |
JSJ |
Watched Little Brother for ~3.5 hours. 301 eruptions. During most individual minutes, Little Brother would erupt once, twice, or three times. After the end of a Three Crater eruption, Little Brother would slow down for 8 or 9 minutes. After a longer Three Crater eruption, which was about 12 minutes in duration, Little Brother slowed down for about 12 minutes. In individual minutes during the slowdowns, Little Brother would have zero eruptions or one eruption only. Filmed some of these. |
| 39998 |
22 Jun 2025 @ 0836 |
--- |
CraigC |
seems to erupt about twice a minute during Three Crater eruptions |
| 40020 |
16 Jun 2025 @ 1214 |
--- |
Siegmund |
Little Brother active on intervals 30-60 seconds. I did not see the same at on the 15th, or at 1015 on the 16th. I did see the same continue the 17th to 20th every time I drove past. |
| 39004 |
12 May 2025 @ 1007 |
--- |
steve |
Little Brother is erupting, usually with intervals under one minute and durations of 2-5 seconds. Height 3 to 12 feet. |
| 38690 |
29 Apr 2025 @ 1355 |
29 Apr 2025 @ 1357 |
Graham |
2 eruptions per minute up to now, then a gap. Three Crater also quiet. |
| 38629 |
26 Apr 2025 @ 0717 |
--- |
CraigC |
Little Brother is erupting more than once a minute, but GT won't accept multiple entries for the same minute. |
| 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. |