Last Known Eruption
21d 10h 52m ago

Latest Eruptions

Eruption DurationInterval
25 Oct 2018 @ 1002 wc6d 20h 22m
18 Oct 2018 @ 1340 ie wc10d 13h 40m
08 Oct 2018 @ 0000 ns wc30m 7d 8h 15m
30 Sep 2018 @ 1545 A3d 7h 38m
27 Sep 2018 @ 080733m 5d 9h 25m
21 Sep 2018 @ 2242 wc4d 11h 9m
17 Sep 2018 @ 1133 ie3d 10h 33m
14 Sep 2018 @ 0100 A18d 17h 28m
26 Aug 2018 @ 0732 wc3d 13h 4m
22 Aug 2018 @ 182835m 5d 6h 31m
17 Aug 2018 @ 1157 A10d 7h 2m
07 Aug 2018 @ 0455 wc3d 10h 9m
03 Aug 2018 @ 1846 ie4d 9h 58m
30 Jul 2018 @ 084837m 8d 9h 42m
21 Jul 2018 @ 230634m 8d 20h 27m
13 Jul 2018 @ 0239 wc4d 22h 39m
08 Jul 2018 @ 0400 A6d 10h 43m
01 Jul 2018 @ 171734m 6d 8h 48m
25 Jun 2018 @ 0829 ns38m 11d 4h 19m
14 Jun 2018 @ 0410 wc7d 14h 52m
06 Jun 2018 @ 131832m 75d 21h 12m
22 Mar 2018 @ 1606 ? wc3d 10h 11m
19 Mar 2018 @ 0555 wc17d 19h 24m
01 Mar 2018 @ 0931 ie wc29d 19h 8m
30 Jan 2018 @ 142332m 30d 9h 25m
31 Dec 2017 @ 0458 wc50d 8h 49m
10 Nov 2017 @ 2008:40 E5d 18h 5m 0s
05 Nov 2017 @ 0203:40 E5d 4h 51m
30 Oct 2017 @ 2212 wc7d 7h 53m
23 Oct 2017 @ 1418:40 E8d 3h 24m
15 Oct 2017 @ 10546d 10h 54m
09 Oct 2017 @ 0000 wc5d 14h 44m
03 Oct 2017 @ 0916 ns wc5d 3h 2m
28 Sep 2017 @ 0614 ns wc7d 8h 5m
20 Sep 2017 @ 2208:40 E14d 11h 6m
06 Sep 2017 @ 110229m 5d 14h 56m
31 Aug 2017 @ 200634m 9d 6h 23m
22 Aug 2017 @ 134333m 10d 49m
12 Aug 2017 @ 125431m 9d 16h 25m
02 Aug 2017 @ 202929m 2d 14h 5m
31 Jul 2017 @ 062434m 11d 14h 57m
19 Jul 2017 @ 152734m 10d 9h 22m
09 Jul 2017 @ 060533m 9d 12h 41m
29 Jun 2017 @ 1723 E9d 11h 42m
20 Jun 2017 @ 0541 wc4d 13h 34m
15 Jun 2017 @ 160729m 103d 3h 28m
04 Mar 2017 @ 1138 E24d 15h 40m
07 Feb 2017 @ 1958 E19d 1h 50m
19 Jan 2017 @ 1808 E17d 16h 0m
02 Jan 2017 @ 0208 E8d 20h 5m
24 Dec 2016 @ 0603 E10d 12h 22m
13 Dec 2016 @ 1741 ns wc4d 17h 42m
08 Dec 2016 @ 2358 E8d 5h 45m
30 Nov 2016 @ 1813 E11d 0m
19 Nov 2016 @ 1813 E3d 19h 40m
15 Nov 2016 @ 2233 E6d 7h 40m
09 Nov 2016 @ 1453 E4d 6h 40m
05 Nov 2016 @ 091332m 14d 14h 44m
21 Oct 2016 @ 1828 E5d 10h 54m
16 Oct 2016 @ 0734 wc7d 13h 21m
08 Oct 2016 @ 181329m 7d 20h 34m
30 Sep 2016 @ 2138 E3d 9h 39m
27 Sep 2016 @ 115936m 4d 6h 5m
23 Sep 2016 @ 0554 wc5d 2h 37m
18 Sep 2016 @ 0317 wc7d 4h 50m
10 Sep 2016 @ 2227 wc7d 11h 41m
03 Sep 2016 @ 104637m 5d 20h 33m
28 Aug 2016 @ 141333m 6d 1h 20m
22 Aug 2016 @ 125333m 4d 8m
18 Aug 2016 @ 124529m 4d 1h 55m
14 Aug 2016 @ 105033m 5d 21h 41m
08 Aug 2016 @ 130933m 4d 21h 9m
03 Aug 2016 @ 160035m 5d 19h 57m
28 Jul 2016 @ 200333m 4d 23h 16m
23 Jul 2016 @ 204731m 4d 15h 10m
19 Jul 2016 @ 053730m 4d 6h 48m
14 Jul 2016 @ 224929m 5d 10h 19m
09 Jul 2016 @ 123030m 4d 22h 8m
04 Jul 2016 @ 142236m 9d 19h 29m
24 Jun 2016 @ 185332m 4d 6h 5m
20 Jun 2016 @ 124835m 4d 19h 49m
15 Jun 2016 @ 165937m 7d 20h 4m
07 Jun 2016 @ 2055>33m 6d 19h 57m
01 Jun 2016 @ 0058 wc6d 5h 3m
25 May 2016 @ 1955 ie9d 19h 55m
16 May 2016 @ 0000 A6d 2h 0m
09 May 2016 @ 2200 A5d 9h 20m
04 May 2016 @ 12406d 12h 40m
28 Apr 2016 @ 0000 A5d 3h 29m
22 Apr 2016 @ 2031 wc6d 4h 57m
16 Apr 2016 @ 153433m 21d 17h 7m
25 Mar 2016 @ 2227 ? wc5d 2h 35m
20 Mar 2016 @ 1952 wc14d 10h 46m
06 Mar 2016 @ 0806 wc19d 11h 52m
15 Feb 2016 @ 2014 wc23d 6h 19m
23 Jan 2016 @ 1355 wc11d 13h 5m
12 Jan 2016 @ 0050 wc4d 19h 55m
07 Jan 2016 @ 0455 wc7d 18h 40m
30 Dec 2015 @ 1015 A16d 5h 31m
14 Dec 2015 @ 0444 wc18d 4h 49m

Interval Statistics

Interval Count100
Min2d 14h 5m
Max103d 3h 28m
Mean10d 15h 27m
Median6d 16h 18m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
10716 04 Nov 2018 @ 0840 --- steve No overnight eruption
10707 03 Nov 2018 @ 1115 --- steve No eruption overnight
10704 02 Nov 2018 @ 1143 --- steve It appears F&M did not erupt overnight. No ice or other signs.
10699 01 Nov 2018 @ 1250 --- steve At F&M I just watched three quick junk cycles. River, then High and Gold after a few minutes, then all off after a few minutes, then maybe five minutes off before it all repeats.
10619 18 Oct 2018 @ 1340 18 Oct 2018 @ 1344 MikeG Steam visible on webcam. Too much wind to know if it's really coming from F&M.
10606 13 Oct 2018 @ 1400 --- Tara No eruption overnight.
10599 12 Oct 2018 @ 0920 --- Suzanne No eruption overnight.
10587 08 Oct 2018 @ 0930 --- Tara Erupted overnight before the frost. Mortar's catchbasins full, wash on path.
10586 07 Oct 2018 @ 1830 --- William Unattended. No eruption as of 18:30
10572 06 Oct 2018 @ 0950 --- Tara No eruption overnight.
10570 05 Oct 2018 @ 1925 --- William Unattended. Had not erupted when I left at 19:25.
10565 05 Oct 2018 @ 1020 --- Tara No eruption overnight.
10505 30 Sep 2018 @ 1730 --- ThomasR Bridge and boardwalk wet. All vents quiet.
10476 27 Sep 2018 @ 0500 --- Graham No eruption yet.
10475 26 Sep 2018 @ 1950 --- William Had not erupted when I left at 19:50.
10468 26 Sep 2018 @ 1844 --- Brian Unattended
10465 26 Sep 2018 @ 1534 --- Polly Unattended
10454 26 Sep 2018 @ 0600 --- Graham No eruption yet.
10451 25 Sep 2018 @ 1910 --- Brian Unattended
10331 21 Sep 2018 @ 1818 --- Brian Unattended at 1818
10315 21 Sep 2018 @ 0645 --- Graham Has not erupted yet.
10173 13 Sep 2018 @ 0705 --- Kyle no eruption overnight. now at 18 days
10160 12 Sep 2018 @ 0645 --- Kyle did not erupt overnight
10139 11 Sep 2018 @ 0630 --- Kyle did not erupt overnight
10127 10 Sep 2018 @ 0632 --- Kyle has not erupted. now at 14d 23h.
10118 09 Sep 2018 @ 0759 --- EmilyW No overnight eruption
10095 08 Sep 2018 @ 0715 --- Kyle no eruption overnight. 13 days so far
10080 07 Sep 2018 @ 0445 --- Kyle no overnight eruption
10054 06 Sep 2018 @ 0532 --- Kyle no eruption overnight
10051 05 Sep 2018 @ 2125 --- Tara Unattended.
10040 05 Sep 2018 @ 0455 --- Kyle has not erupted. at later stage if cycle. back vents steaming. poor water levels.
10039 04 Sep 2018 @ 2220 --- Kyle no eruption yet. at the later stage of a cycle. poor water levels
10036 04 Sep 2018 @ 1955 --- RMichaels Unattended.
10019 04 Sep 2018 @ 0508 --- SteveO No F&M yet.
10015 03 Sep 2018 @ 1945 --- RMichaels Unattended. No Event Cycles observed during daylight hours.
9995 03 Sep 2018 @ 0613 --- RMichaels No eruption yet.
9993 02 Sep 2018 @ 2303 --- Kyle has not erupted. late stage of a cycle. back vents steaming no water left in high or gold
9983 02 Sep 2018 @ 0635 --- Kyle no eruption over night
9980 01 Sep 2018 @ 1837 --- Pat Snyder unattended
9973 01 Sep 2018 @ 0450 --- Kyle did not erupt overnight
9958 31 Aug 2018 @ 0530 --- SteveO No F&M yet.
9941 30 Aug 2018 @ 0727 --- EmilyW No overnight eruption
9931 29 Aug 2018 @ 1910 --- c.barwin Unattended.
9820 22 Aug 2018 @ 1251 --- c.barwin unattended as of 1251.. angle on at 1250
9738 16 Aug 2018 @ 2120 --- Tara No eruption yet.
9731 16 Aug 2018 @ 0945 --- Tara No eruption yet.
9729 15 Aug 2018 @ 2033 --- Tara Unattended.
9723 15 Aug 2018 @ 0824 --- c.barwin no overnight eruption
9708 14 Aug 2018 @ 0820 --- c.barwin no overnight eruption
9696 13 Aug 2018 @ 0646 --- JimS No eruption overnight.
9655 12 Aug 2018 @ 0610 --- JimS No eruption overnight.
9647 11 Aug 2018 @ 2125 --- Tara Unattended.
9640 11 Aug 2018 @ 0818 11 Aug 2018 @ 1502 c.barwin No morning or early-mid afternoon events. The last two cycles were long and MV emitted "half hearted" steam while RV sputtered along like it could pause. The first long cycle was 1130 RV on to 1256 RV on followed by 1256 RV on to 1445 RV on.
9620 11 Aug 2018 @ 0633 --- JimS No eruption overnight.
9606 10 Aug 2018 @ 2040 --- Tara Unattended.
9404 02 Aug 2018 @ 1314 --- hkoenig Fan minor. Hard to say when exactly started. Looked like extended “lock”. D>12m35s. Define end. Looked like photos and descriptions of 19th century activity.
9325 30 Jul 2018 @ 0650 --- hkoenig No eruption overnight.
9256 21 Jul 2018 @ 0244 --- hkoenig No eruption.
9247 20 Jul 2018 @ 0454 --- C Daubert no eruption overnight
9244 19 Jul 2018 @ 2100 --- Tara Unattended
9243 19 Jul 2018 @ 0642 --- hkoenig Nothing overnight, marker in place.
9240 18 Jul 2018 @ 1545 --- Tara Unattended
9239 18 Jul 2018 @ 0850 --- Tara No eruption yet. Came up on what was probably the tail end of an event cycle. Water levels were poor but Bottom Vent's runoff was damp, Back Vents were on, and there was a single angled splash in Main Vent.
9166 13 Jul 2018 @ 0524 --- C Daubert boardwalk is wet, probable overnight eruption
9049 06 Jul 2018 @ 2200 --- Tara Unattended.
8511 06 Jun 2018 @ 1230 --- Polly Stream by the outhouse is dry. Firehole River water levels are comparable to what they were last year at the time when F&M came out of dormancy (still on the high side but down considerably from peak).
8261 15 May 2018 @ 1452 15 May 2018 @ 1552 Polly River, High, Gold (with Gold 2 & 3) ie on approach. Very small amount of water in Bottom Vent channel about 1’ down. Angle 1507. At about 1541, Bottom Vent had a sound like breaker waves hitting a rock (bassy sound). By 1543 sounded like Bottom Vent or Lower Mortar was filling - water flowing inside. River was trying to shut off as we left.
8147 10 May 2018 @ 1915 --- Tara Stream next to pit toilet still flowing nicely. F&M in weak garbage.
8088 06 May 2018 @ 1436 --- Micah Kipple Garbage
8090 04 May 2018 @ 1605 --- Tara Weak garbage mode. Creek next to pit toilet flowing nicely.
7865 31 Dec 2017 @ 0459 --- Betty nice mushroom cloud in the right place
7812 03 Nov 2017 @ 1437 --- steve No eruption overnight.
7811 02 Nov 2017 @ 1245 --- steve No eruption overnight
7801 31 Oct 2017 @ 1214 --- steve From the signs at Fan & Mortar It does appear it erupted last night
7795 29 Oct 2017 @ 1349 --- billwarnock Big steam cloud in Fan and Mortar area. Louise checked later and said it hadn't erupted. Steam billowing until 1406. I don't think it was Artemisia.
7711 15 Oct 2017 @ 1330 --- WillBoekel Area washed and fan and mortar dead in recovery mode.
7685 03 Oct 2017 @ 0944 --- Kitt B end time for Fan & Mortar
6919 22 Sep 2017 @ 1030 --- Csiegel Lots of gurgling. Main, river, gold, angle all on sustaining about 2ft bursts then nothing.
6856 20 Sep 2017 @ 0823 --- JimS No eruption yet.
6854 19 Sep 2017 @ 1645 --- Csiegel Nuthin... Lots of churning. Gold on. River on.
6851 19 Sep 2017 @ 1250 --- Polly No F & M yet.
6808 18 Sep 2017 @ 1600 --- Polly Unattended
6804 18 Sep 2017 @ 1240 --- Polly Unattended.
6751 18 Sep 2017 @ 0740 --- JimS No eruption yet.
6664 17 Sep 2017 @ 1730 --- Polly Unattended
6627 17 Sep 2017 @ 0659 --- JimS No eruption yet.
6613 16 Sep 2017 @ 1925 --- Tara Unattended.
6435 16 Sep 2017 @ 0454 --- Graham No eruption overnight
6433 15 Sep 2017 @ 2002 --- RLJones No eruption yet. F&M unattended.
6373 14 Sep 2017 @ 2009 --- RLJones No eruption yet. F&M now unattended.
6363 14 Sep 2017 @ 0500 --- Graham No eruption overnight
6362 13 Sep 2017 @ 1902 --- Graham Abandoned after event cycle and to avoid more of the storm.
6328 13 Sep 2017 @ 0550 --- Graham No eruption overnight
6326 12 Sep 2017 @ 1957 --- Tara Unattended.
6287 12 Sep 2017 @ 0550 --- Graham No eruption yet
6286 11 Sep 2017 @ 1915 --- Polly Unattended
6266 10 Sep 2017 @ 1920 --- Polly Unattended
6261 10 Sep 2017 @ 0953 10 Sep 2017 @ 1142 Polly Mostly organized series of cycles (long cycle, quick cycle, quick River & Angle on then off, cycle with decent water). This is what I like to see. Worth keeping an eye on.
6252 10 Sep 2017 @ 0953 --- Polly Bottom Vent channel damp almost to the river.
5552 31 Aug 2017 @ 1815 --- c.barwin Unattended. Finishing a normal cycle.
EntrySourceLinkComment
06 Jun 2018 @ 1318 JSJ https://www.youtube.com/watch?v=577PNumPMvc#t=10m28s Video of Fan & Mortar Geysers' 1:18 to 1:52 PM major eruption on 6 June 2018.
17 Jul 2018 @ 2134 EmilyW https://imgur.com/z13q7vZ Webcam capture from July 17th in the first minute steam appears in the fan and mortar area on the webcam
06 Jun 2018 @ 1318 JSJ https://www.flickr.com/photos/jsjgeology/41518400070 Photo (out of 16) of Fan & Mortar Geysers' 1:18 to 1:52 PM eruption on 6 June 2018.
19 Mar 2018 @ 0555 EricZ https://www.youtube.com/watch?v=xtgCz2D1Wfw&t=14m43s Link to video review of that timeframe. Starts @ 14m 43s
31 Jul 2017 @ 0624 Tara https://youtu.be/kSklbSOYTp8 Video by Tara Cross.
31 Aug 2017 @ 2006 Tara https://youtu.be/6m2cmX6aIfw Eruption video by Tara Cross.
22 Aug 2017 @ 1343 JSJ https://www.youtube.com/watch?v=CHxKxRM53s0 Video by David Schwarz of Fan & Mortar's 1:43 to 2:16 PM eruption on 22 August 2017. The action starts at about time stamp 0:40.
04 Aug 2009 @ 0930 Tara https://youtu.be/j6kgoHwTRVg Video by Tara Cross.
22 Jul 2009 @ 1705 Tara https://youtu.be/SXrTs60JXFU Video by Tara Cross.
24 Aug 2008 @ 0856 Tara https://youtu.be/tXbXAvnTAqo Video by Tara Cross.
03 Sep 2016 @ 1046 JSJ https://www.youtube.com/watch?v=fHBNk8QUtOc Another video showing the lead-up & initiation of Fan & Mortar Geysers' late morning eruption on 3 September 2016 (the action starts at time stamp 3:44).
27 Sep 2016 @ 1159 JSJ https://www.youtube.com/watch?v=jTesyPxEi1k Video of Fan & Mortar Geysers' noon-time eruption on 27 September 2016.
03 Sep 2016 @ 1046 JSJ https://www.youtube.com/watch?v=Wi4GAkZtZ6Q Video of lead-up & initiation of Fan & Mortar Geysers' late morning eruption on 3 September 2016.
03 Aug 2016 @ 1600 JSJ https://www.youtube.com/watch?v=M4D-IWcJ0RM Video of Fan & Mortar Geysers' 4:00 PM-onward eruption on 3 August 2016.
04 Jul 2016 @ 1422 JSJ https://www.flickr.com/photos/jsjgeology/28118687280 Thermal image (1 of 6) of Fan Geyser's 2:22 to 2:58 PM eruption on 4 July 2016.
04 Jul 2016 @ 1422 JSJ https://www.flickr.com/photos/jsjgeology/27755417113 Photo (1 of 10) of Fan Geyser's 2:22 to 2:58 PM eruption on 4 July 2016.
04 Jul 2016 @ 1422 JSJ https://www.youtube.com/watch?v=dqqb0EG5ODE#t=12m40s Clips 24-36 of this video compilation (time stamp 12:40-onward) show Fan Geyser's 2:22 to 2:58 PM eruption on 4 July 2016.
23 Jan 2015 @ 1317 WillBoekel https://www.youtube.com/watch?v=jfzijBk43wc&list=PLROlDXCUlcDtsmrLRYTjg8BqhsS_TXTB2&index=6 Here is the capture from that day Don't see any F&M steam at 1317 or after that point.
27 Jul 2010 @ 1956 Tara https://www.youtube.com/watch?v=D2MA9VbvFBA&feature=youtu.be Video of eruption by Tara Cross. Eruption starts at about 7:50 in the video.
30 Sep 2012 @ 1148 Micah Kipple https://www.youtube.com/watch?v=fuM2EV8SVx8 Will Boekel Video
BaselineDistance (ft)Description
Rock 100Both markers are on a rock behind the benches on the upstream side of the path


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