Last Known Eruption
5d 11h 38m ago

Latest Eruptions

Eruption DurationInterval
20 Oct 2021 @ 14332d 22h 52m
17 Oct 2021 @ 15412d 23h 15m
14 Oct 2021 @ 1626 maj3d 23h 11m
10 Oct 2021 @ 1715 maj9h 0m
10 Oct 2021 @ 08151d 14h 47m
08 Oct 2021 @ 17282h 14m
08 Oct 2021 @ 15142h 24m
08 Oct 2021 @ 1250 A20h 7m
07 Oct 2021 @ 164310d 12h 43m
27 Sep 2021 @ 0400 A2h 50m
27 Sep 2021 @ 011015h 7m
26 Sep 2021 @ 100321h 42m
25 Sep 2021 @ 12212d 22h 24m
22 Sep 2021 @ 135723h 50m
21 Sep 2021 @ 14071h 46m
21 Sep 2021 @ 122110d 17h 47m
10 Sep 2021 @ 18349h 51m
10 Sep 2021 @ 08431h 49m
10 Sep 2021 @ 065412h 59m
09 Sep 2021 @ 17553d 4h 35m
06 Sep 2021 @ 13202d 19h 19m
03 Sep 2021 @ 18011d 42m
02 Sep 2021 @ 1719 ie maj3d 1h 15m
30 Aug 2021 @ 16046h 28m
30 Aug 2021 @ 09362d 21h 44m
27 Aug 2021 @ 11523d 14h 17m
23 Aug 2021 @ 2135 A7h 46m
23 Aug 2021 @ 13491h 16m 9h 23m
23 Aug 2021 @ 04268h 47m
22 Aug 2021 @ 19391d 7h 16m
21 Aug 2021 @ 12234d 15h 58m
16 Aug 2021 @ 202520h 7m
16 Aug 2021 @ 00187h 9m
15 Aug 2021 @ 17094h 16m
15 Aug 2021 @ 12536h 14m
15 Aug 2021 @ 063912h 12m
14 Aug 2021 @ 18272d 2h 14m
12 Aug 2021 @ 1613 maj5h 31m
12 Aug 2021 @ 10423h 14m
12 Aug 2021 @ 072819h 19m
11 Aug 2021 @ 12094d 20h 42m
06 Aug 2021 @ 1527 maj5h 50m
06 Aug 2021 @ 093716h 32m
05 Aug 2021 @ 170548m 5h 37m
05 Aug 2021 @ 11281d 17h 40m
03 Aug 2021 @ 1748:004h 16m
03 Aug 2021 @ 13324h 35m
03 Aug 2021 @ 08572d 14h 32m
31 Jul 2021 @ 1825 maj6h 26m
31 Jul 2021 @ 11598h 21m
31 Jul 2021 @ 03389h 4m
30 Jul 2021 @ 18344h 4m
30 Jul 2021 @ 14302d 17h 55m
27 Jul 2021 @ 20356h 16m
27 Jul 2021 @ 14196h 58m
27 Jul 2021 @ 07217h 15m
27 Jul 2021 @ 00064h 10m
26 Jul 2021 @ 19564h 41m
26 Jul 2021 @ 1515 A2h 58m
26 Jul 2021 @ 12172h 22m
26 Jul 2021 @ 095515h 25m
25 Jul 2021 @ 1830 A5h 36m
25 Jul 2021 @ 12542d 6h 52m
23 Jul 2021 @ 060221h 35m
22 Jul 2021 @ 082710h 45m
21 Jul 2021 @ 21422h 41m
21 Jul 2021 @ 19012h 35m
21 Jul 2021 @ 16265h 27m
21 Jul 2021 @ 10592d 16h 8m
18 Jul 2021 @ 18512d 7h 31m
16 Jul 2021 @ 1120 maj22h 44m
15 Jul 2021 @ 12361h 24m 3h 1m
15 Jul 2021 @ 09351h 5m 1h 57m
15 Jul 2021 @ 07381h 20m 13h 5m
14 Jul 2021 @ 18332h 59m
14 Jul 2021 @ 15341h 22m 20h 17m
13 Jul 2021 @ 191712h 15m
13 Jul 2021 @ 0702 ie2d 18h 19m
10 Jul 2021 @ 1243 maj3h 11m
10 Jul 2021 @ 09321h 1m 3h 47m
10 Jul 2021 @ 0545 A10h 11m
09 Jul 2021 @ 19342h 7m
09 Jul 2021 @ 17271d 1h 58m
08 Jul 2021 @ 15293h 48m
08 Jul 2021 @ 114111d 19h 45m
26 Jun 2021 @ 15568h 49m
26 Jun 2021 @ 07071d 18h 29m
24 Jun 2021 @ 12384d 4h 43m
20 Jun 2021 @ 07552d 16h 19m
17 Jun 2021 @ 153631m
17 Jun 2021 @ 1505 min5h 38m
17 Jun 2021 @ 092716h 40m
16 Jun 2021 @ 16476h 12m
16 Jun 2021 @ 10351h 7m 20h 40m
15 Jun 2021 @ 13554h 21m
15 Jun 2021 @ 09342d 16h 31m
12 Jun 2021 @ 1703 maj1d 4h 20m
11 Jun 2021 @ 12435d 5h 28m
06 Jun 2021 @ 071520d 22h 40m
16 May 2021 @ 08351d 22h 38m

Interval Statistics

Interval Count100
Min31m
Max20d 22h 40m
Mean1d 14h 12m
Median12h 13m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
19943 10 Oct 2021 @ 0625 --- Ben VL Dan walked up to extremely large Upper Mortar surging at this time, WAY over the cone.
19471 10 Sep 2021 @ 2145 --- Tara Arrived at 2145 to find Bottom Vent's runoff channel wet to the river with some puddles closer to the vent. Probably the tail end of an event cycle. All vents on including Frying Pan, Gold in steam, only light grumbles from Upper Mortar.
18825 04 Aug 2021 @ 1510 04 Aug 2021 @ 1540 Brian 9 hour Angle marathon, punctuated with a brief flurry of activity. At ~1510, BV started some low splashing and LM showed low water. At 1518, R and G turned on, with A already on as it had been all day. 1520, MV huff, which shut off R, G and A. A restart at 1529, closely followed by two MV splashes. RV at 1530, GV 1533. Nothing came of this activity, but it was the very first pattern change of the day at F&M.
16009 07 Sep 2020 @ 1401 07 Sep 2020 @ 1445 William splashing in Main on arrival at 14:01, splash again at 14:03 and 14:08, water in bottom vent reaching the river by 14:12. river on weak at 14:23 with high and gold attempting to turn on unsuccessfully from 14:23-14:34, river pause at 14:34 for 4m when R, H, G and A all on at 14:38, no further splashes in main by 14:45.
14570 09 Jun 2020 @ 0944 --- underarockphoto Korben Cooper did not know the names of vents. He went down to check a reported eruption at 0513 and walked up to an event cycle. Via text we figured out which vent was which and he relayed all of the information to me via text message. I translated it to "Fan and Mortar-ese" and posted to GT. I need coffee. Flippin' kudos, Korben. That was spectacular.
9667 12 Aug 2018 @ 0923 --- Tara Arrived to find Bottom Vent's channel damp, Back Vents on, and huffs and low splashes in Upper Mortar. Probably the very end of an event cycle.
8367 30 May 2018 @ 1344 --- Janet Jones River vent on and very small splashing from Fan’s vents. No time for more observations.
6270 11 Sep 2017 @ 0608 --- Graham Garbage this morning but a couple of big splashes from MV 0608 while river on when I returned after being gone for 35m. GV started 0616. AV 0619. Bottom Vent runoff to the river by 0608. Water levels were pretty good until 0629. RV off 0708 so it was on at least an hour.
4371 27 Jun 2017 @ 1937 --- Kitt B River off with at least 4 splashes in Main. Gold on at 2001. I relayed several calls, but didn't write anything until I (Kitt) got there. Water levels were variable to poor with Angle almost the biggest. (Will delete this when Chris puts his info in.)
3070 15 Jun 2016 @ 0717 --- JimS River off 0717. Splashing began 0732. River on 0745, Gold 0753, Angle 0756. Declared dead 0810.
1786 23 Jun 2015 @ 1630 23 Jun 2015 @ 1710 bhoppe Probably arrived during a River pause, runoff from minor vents was totally dry. Main Vent was splashing upon arrival. River pause at 1641 (d=5m). Water was visible in Upper Mortar throughout the pause. River on 1646, Gold on at 1656, Angle on at 1702. Water levels never really looked good.
776 21 Apr 2013 @ 1156 21 Apr 2013 @ 1325 WillBoekel
  • 11:56 Bottom spritzing
  • 11:58:10 light steam in main
  • 12:01 Upper Mortar steam -few sec
  • 12:02:20 small splashes in lower mortar
  • 12:02 River On
  • 12:03:50 High on
  • 12:08 Gold on
  • 12:09 Angle on
  • 12:27 Upper Mortar steam
  • 12:29 River off-Angle continue
  • 12:31 Bottom spritzing
  • 12:33 River on
  • 12:34 High on then Gold also
  • 12:35 Gold cough
  • 12:39 light steam in main
  • 12:40 small splashes in Lower Mortar
  • 12:41 River on
  • 12:41 High on
  • 12:42 light steam in main
  • 12:44:45 Gold on
  • 12:49 Angle on
  • 12:50 Bottom vent now quiet
  • 13:00 small grumble in Upper Mortar
  • 13:03 All vents in system off
  • 13:04 Angle blipping
  • 13:05 Angle increase in strength
  • 13:06 Bottom spritzing
  • 13:16 River on
  • 13:18:42 Gold and high on-Gold first by a second or two
  • 13:25 Angle on
  • 26 13 Sep 2011 @ 1300 --- Graham Approx 1300 river pause and splashing in Main vent
    EntrySourceLinkComment
    06 Jun 2018 @ 1228 JSJ https://www.youtube.com/watch?v=V6v-pWJqTwY#t=5m22s Clips 16-17 of this video compilation (= time stamp 5:22 to 5:46) show the end of Fan Geyser’s 12:28 to 1:18 PM event cycle on 6 June 2018.
    14 Aug 2018 @ 1750 JSJ https://www.youtube.com/watch?v=V6v-pWJqTwY#t=3m27s Clips 11-15 of this video compilation (= time stamp 3:27 to 5:21) show Fan Geyser's 5:50 PM-onward event cycle on 14 August 2018.
    02 Jul 2016 @ 0951 JSJ https://www.youtube.com/watch?v=dqqb0EG5ODE#t=6m15s Clips 13-19 of this video compilation (time stamp 6:15 to time stamp 11:06) show Fan Geyser's 9:51 AM-onward event cycle on 2 July 2016.
    04 Jul 2016 @ 1315 JSJ https://www.youtube.com/watch?v=dqqb0EG5ODE#t=11m06s Clips 20-23 of this video compilation (time stamp 11:06 to time stamp 12:39) show Fan Geyser's 1:15 to 2:22 PM event cycle on 4 July 2016.
    Baseline does not exist.