Last Known Eruption
65d 15h 54m ago

Latest Eruptions

Eruption DurationInterval
18 Dec 2023 @ 113975d 20h 44m
03 Oct 2023 @ 1555 ie5d 21m
28 Sep 2023 @ 15341d 0m
27 Sep 2023 @ 1534 ie18d 44m
09 Sep 2023 @ 145055m 20h 40m
08 Sep 2023 @ 18102d 22h 33m
05 Sep 2023 @ 19373d 5h 57m
02 Sep 2023 @ 1340 ie4d 1h 32m
29 Aug 2023 @ 1208 ie3d 26m
26 Aug 2023 @ 1142 ie7d 17h 37m
18 Aug 2023 @ 18051d 8h 53m
17 Aug 2023 @ 091210d 13h 52m
06 Aug 2023 @ 192017d 5h 23m
20 Jul 2023 @ 135723h 34m
19 Jul 2023 @ 14232d 2h 0m
17 Jul 2023 @ 122314h 47m
16 Jul 2023 @ 21363h 0m
16 Jul 2023 @ 18364h 43m
16 Jul 2023 @ 13531d 22h 23m
14 Jul 2023 @ 153017h 22m
13 Jul 2023 @ 22083h 23m
13 Jul 2023 @ 18458h 15m
13 Jul 2023 @ 1030 A1d 16h 0m
11 Jul 2023 @ 1830 A1d 6h 55m
10 Jul 2023 @ 113521h 56m
09 Jul 2023 @ 13394d 5h 39m
05 Jul 2023 @ 0800 A20h 20m
04 Jul 2023 @ 1140 ie1d 16h 20m
02 Jul 2023 @ 1920 ie1d 3h 20m
01 Jul 2023 @ 1600 ie19h 30m
30 Jun 2023 @ 2030 A14d 12h 10m
16 Jun 2023 @ 08201d 15h 14m
14 Jun 2023 @ 170639m 22h 40m
13 Jun 2023 @ 182610h 36m
13 Jun 2023 @ 0750299d 42m
18 Aug 2022 @ 070879d 13h 0m
30 May 2022 @ 18083d 2h 48m
27 May 2022 @ 15208d 5h 17m
19 May 2022 @ 1003 ?8d 22h 8m
10 May 2022 @ 1155 maj14d 15h 59m
25 Apr 2022 @ 195680d 6h 14m
04 Feb 2022 @ 1242 ie106d 23h 9m
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

Interval Statistics

Interval Count100
Min1h 46m
Max299d 42m
Mean8d 17h 58m
Median23h 42m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
27653 17 Aug 2023 @ 0912 17 Aug 2023 @ 1027 Suzanne RV on 912, off 915. Main Vent splashing, Bottom Vent ie. RV back on at 936. Main Vent continues to splash. Another brief RV pause with River back on at 946. Good splashing out of Lower Mortar. Gold on 956. Gold and High activity sporadic. Angle came on briefly just blipping at 1009. RV tried to shut off but then all 3 vents were on at 1015. River off 1027.
26796 02 Jul 2023 @ 1300 --- Ben VL Cycle which this current interval seems to treat as an event cycle at this time. Decided to move the entry to regular cycle for now.
24298 07 Oct 2022 @ 1535 --- Ben VL Recovery event cycle in progress at this time. If only it could do this when it counts!
21370 19 May 2022 @ 1920 --- Tara Bottom Vent channel damp all the way to the River, still a few puddles closer to BV. Guessing there was an event cycle in the past few hours.
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.