Last Known Eruption
3d 14h 36m ago

Latest Eruptions

EruptionDurationInterval
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 9h 14m
20 Sep 2017 @ 2100 A14d 9h 58m
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
25 Nov 2015 @ 2355 wc16d 23h 55m
09 Nov 2015 @ 0000 A13d 3h 32m
26 Oct 2015 @ 2128 wc19d 2h 29m
07 Oct 2015 @ 185940d 9h 27m
28 Aug 2015 @ 093232m 126d 13h 3m
23 Apr 2015 @ 2029 ie wc114d 5h 29m
30 Dec 2014 @ 1400 wc6d 14h 0m
24 Dec 2014 @ 0000 A11d 0m
13 Dec 2014 @ 0000 A43d 11h 40m
30 Oct 2014 @ 13204d 13h 20m
26 Oct 2014 @ 0000 A11d 9h 38m
14 Oct 2014 @ 142229 m. +5d 1h 32m
09 Oct 2014 @ 12506d 12h 50m
03 Oct 2014 @ 0000 ? A6d 8h 59m
26 Sep 2014 @ 15014d 16h 1m
21 Sep 2014 @ 2300 A6d 9h 0m
15 Sep 2014 @ 14006d 16h 40m
08 Sep 2014 @ 2120 A9d 7h 51m
30 Aug 2014 @ 132932m 6d 5h 4m
24 Aug 2014 @ 082534m 7d 4h 55m
17 Aug 2014 @ 0330 A4d 8h 34m
12 Aug 2014 @ 185630m 5d 18h 56m
07 Aug 2014 @ 0000 A4d 0m
03 Aug 2014 @ 0000 A5d 18h 16m
28 Jul 2014 @ 0544 wc9d 18h 34m
18 Jul 2014 @ 1110 ns31m 2d 23h 27m
15 Jul 2014 @ 114333m 5d 11h 43m
10 Jul 2014 @ 0000 A11d 0m
29 Jun 2014 @ 0000 A4d 12h 0m
24 Jun 2014 @ 1200 A88d 12h 0m

Interval Statistics

Interval Count100
Min2d 14h 5m
Max126d 13h 3m
Mean12d 23h 23m
Median6d 13h 25m

Latest Notes

Note IDStart TimeEnd TimeEntrantNote
7711 15 Oct 2017 @ 1330 --- WillBoekel Area washed and fan and mortar dead in recovery mode.
7710 15 Oct 2017 @ 1054 --- Janet White Lots of steam in the right place as seen from Grand but snow still on the wrong place for an eruption to have occurred. Steve C and I aren’t sure what we saw -will share a photo of the steam cloud for input.
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.
5516 31 Aug 2017 @ 0632 --- JimS No eruption yet.
5514 30 Aug 2017 @ 2000 --- Tara Unattended.
5507 30 Aug 2017 @ 0800 --- c.barwin No overnight eruption.
5197 22 Aug 2017 @ 0625 --- JimS No eruption yet.
5192 21 Aug 2017 @ 1940 --- c.barwin unattended. RV on 1921, GV on 1935, AV on 1940
5180 20 Aug 2017 @ 2245 --- Tara No eruption as of this time. Regular cycle in progress at 2230.
5175 20 Aug 2017 @ 1820 --- c.barwin unattended. river on at 1759
5155 20 Aug 2017 @ 0636 --- JimS No eruption yet.
5037 19 Aug 2017 @ 0636 --- JimS No eruption yet.
4940 18 Aug 2017 @ 0639 --- JimS No eruption yet.
4882 12 Aug 2017 @ 0626 --- JimS No eruption yet.
4876 11 Aug 2017 @ 2048 --- Tara Unattended.
4875 11 Aug 2017 @ 0626 --- JimS No eruption yet.
4874 10 Aug 2017 @ 2123 --- AndrewW Unattended
4872 10 Aug 2017 @ 1525 --- Tara Unattended.
4870 10 Aug 2017 @ 0643 --- JimS No eruption yet.
4867 09 Aug 2017 @ 1436 --- Tara Checked for one cycle, abandoned due to another storm.
4866 09 Aug 2017 @ 1308 --- c.barwin Unattended... thunder & lightening, time to go. Calling it a day. Apologies.
4838 09 Aug 2017 @ 0626 --- JimS Has not erupted.
4833 08 Aug 2017 @ 0640 --- JimS Did not erupt overnight.
4820 07 Aug 2017 @ 0834 --- AndrewW No overnight eruption, at least one event cycle this morning based on report from JoeB
4586 31 Jul 2017 @ 0520 --- AndrewW No overnight eruption
4582 30 Jul 2017 @ 2118 --- AndrewW F&M unattened, no event cycles all day. Final cycles of the day had decent water and lots of steam from main vent but no event cycles.
4579 30 Jul 2017 @ 0610 --- JimS No eruption overnight.
4574 29 Jul 2017 @ 2106 --- Tara Unattended.
4573 29 Jul 2017 @ 0432 --- AndrewW No overnight eruption. Runoff channels of bottom vent are wet to river.
4568 28 Jul 2017 @ 2112 --- Tara Unattended.
4563 28 Jul 2017 @ 0632 --- Suzanne Did not erupt overnight.
4551 27 Jul 2017 @ 0540 --- SteveO No F&M yet.
4543 26 Jul 2017 @ 0625 --- AndrewW No overnight eruption
4530 25 Jul 2017 @ 0545 --- SteveO No F&M yet.
4493 19 Jul 2017 @ 0553 --- SteveO No F&M yet.
4490 18 Jul 2017 @ 2150 --- Tara Unattended.
4479 18 Jul 2017 @ 0600 --- SteveO No F&M yet.
4474 17 Jul 2017 @ 0604 --- SteveO No eruption overnight
4470 15 Jul 2017 @ 2111 --- Tara Unattended.
4424 09 Jul 2017 @ 0500 --- Graham No eruption overnight.
4417 08 Jul 2017 @ 0520 --- Graham No eruption overnight.
4413 07 Jul 2017 @ 0500 --- Graham No eruption overnight.
4412 06 Jul 2017 @ 2115 --- Tara Unattended. 80-minute cycles up to this time.
4410 06 Jul 2017 @ 0500 --- Graham No eruption overnight.
4409 05 Jul 2017 @ 2006 --- Archer Unattended, no event cycles during my sit 1500-2000.
4406 05 Jul 2017 @ 0445 --- Graham No eruption overnight.
4403 04 Jul 2017 @ 0445 --- Graham No eruption overnight
4377 29 Jun 2017 @ 0824 --- SteveO No F&M yet.
4374 28 Jun 2017 @ 0555 --- SteveO No F&M yet.
4368 27 Jun 2017 @ 0535 --- Kitt B no eruption overnight, they are watching
4361 26 Jun 2017 @ 0558 --- Dave from B No eruption overnight
4359 25 Jun 2017 @ 2125 --- Tara Unattended.
4357 25 Jun 2017 @ 0745 --- Polly Did not erupt overnight.
4355 24 Jun 2017 @ 2100 --- Tara F&M unattended.
4489 19 Jun 2017 @ 1256 19 Jun 2017 @ 1614 Polly Fan's water levels have recovered from the June 15 eruption.
4320 15 Jun 2017 @ 1122 --- Polly Bottom Vent channel damp almost to the river.
4313 14 Jun 2017 @ 1316 14 Jun 2017 @ 1427 Polly Cough at 1318, followed by River Vent pause at 1340. Main Vent huffs but no splashes observed. River Vent off at1427 with Angle continuing.
4221 06 Jun 2017 @ 0747 --- AndrewW No overnight eruption, bottom vent run off channels damp to the river.
4188 03 Jun 2017 @ 1040 03 Jun 2017 @ 1322 Polly Bottom Vent runoff channel damp about 1/3 of the way down when I arrived. Long and organized cycles with the exception of a River cough followed by River off for approximately 9 minutes. Overall, Fan's vents had decent water but little steam from Main Vent. Gold 2&3 came on during 2 of the 3 cycles I saw.
3981 21 Apr 2017 @ 1114 --- WillBoekel No recent eruption.
3966 11 Apr 2017 @ 1700 --- Bijoumonkey area not washed
3914 22 Jan 2017 @ 1500 --- Graham Layer of ice under an inch or two of fresh snow. Maybe from Thursday?
3910 19 Jan 2017 @ 1814 --- Graham Probably wishful thinking but it looked like steam in the right spot on the webcam and too early for Riverside. Pretty dark though. GO F&M!
3839 04 Nov 2016 @ 0905 --- steve No eruption of Fan & Mortar from 10-30-16 at 1300 to 11-4-16 at 0900.
3833 31 Oct 2016 @ 1036 --- steve No F & M overnight
3834 30 Oct 2016 @ 1301 --- steve A short event cycle. River on 1301. Main vent splashes at 1309 and 1313 only. River off 1314. River on 1324, gold 1334, angle 1339. For several minutes High varied from 1 to 6 feet every 3 seconds, then it increased to 4 to 8 feet for 2 minutes, then everything died.
3829 29 Oct 2016 @ 1621 --- DanS Cycles but no eruption this afternoon. Lower Mortar strong.
3816 26 Oct 2016 @ 1400 --- DanS Cycles. No eruption
3807 25 Oct 2016 @ 1400 --- DanS Event cycle. Stronger action than Sunday.
3799 23 Oct 2016 @ 1231 --- Janet White area not washed.
3794 21 Oct 2016 @ 1837 21 Oct 2016 @ 1843 Pat Snyder Possible F&M ie at 1837 webcam? Steam in the right spot. Riverside not due, based on the on-site time from earlier today (8 hours ago).
3790 16 Oct 2016 @ 0608 --- SteveO No F&M yet.
3789 15 Oct 2016 @ 1720 --- Kitt B No Fan and Mortar yet
3786 15 Oct 2016 @ 0630 --- SteveO No F&M yet.
3783 14 Oct 2016 @ 0920 --- Kitt B No fan and Mortar yet
3762 08 Oct 2016 @ 0755 --- SteveO No eruption yet.
3761 07 Oct 2016 @ 1826 --- Kitt B No eruption as of 1826.
EntrySourceLinkComment
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
13 Jun 2010 @ 1628 Micah Kipple https://www.youtube.com/watch?v=-6jwMgW4TX8 Another angle
13 Jun 2010 @ 1628 Micah Kipple https://www.youtube.com/watch?v=OskvCNPAoeQ Video
11 Jul 2001 @ 1228 Micah Kipple https://www.youtube.com/watch?v=qxnA2ZlMxpY David Schwarz Video
05 Nov 2014 @ 0953 WillBoekel https://www.facebook.com/photo.php?fbid=10152501200878723&set=pcb.10152519037592399&type=1&theater Post in FB Geyser Gazers
15 Sep 2014 @ 1400 WillBoekel https://www.youtube.com/watch?v=VYfQqNzoHEQ Found a video that was posted by a visitor
12 Aug 2014 @ 1856 WillBoekel https://www.youtube.com/watch?v=bXwoxoU_Jc8 Go Pro 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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