Last Known Eruption
21y 162d 13h 52m ago

Latest Eruptions

Eruption DurationInterval
20 Jun 1999 @ 1400343d 3h 36m
12 Jul 1998 @ 10249d 9m
03 Jul 1998 @ 1015 ie3y 231d 18h 53m
14 Nov 1994 @ 14227m 2s 146d 5m
21 Jun 1994 @ 1517 ie2m
21 Jun 1994 @ 15151d 17m
20 Jun 1994 @ 14583y 352d 1h 8m
04 Jul 1990 @ 1350357d 22h 30m
11 Jul 1989 @ 1520 ie16d 5h 5m
25 Jun 1989 @ 1015 ie17h 45m
24 Jun 1989 @ 1630>5m 6d 5h 10m
18 Jun 1989 @ 1120 ie14y 310d 14h 59m
15 Aug 1974 @ 202111m 1y 109d 7h 58m
28 Apr 1973 @ 112334d 22h 8m
24 Mar 1973 @ 13156.5m 4d 20h 28m
19 Mar 1973 @ 1647167d 8h 42m
03 Oct 1972 @ 090552d 17h 25m
11 Aug 1972 @ 154022h 5m
10 Aug 1972 @ 1735 A18d 2h 0m
23 Jul 1972 @ 15356d 4h 14m
17 Jul 1972 @ 11214m 30s 18h 57m
16 Jul 1972 @ 1624>5m 5h 39m
16 Jul 1972 @ 10455m 18h 31m
15 Jul 1972 @ 1614 ie5h 39m
15 Jul 1972 @ 1035 A17h 42m
14 Jul 1972 @ 1653 ie4m 5h 33m
14 Jul 1972 @ 11201d 1h 10m
13 Jul 1972 @ 10101d 19h 45m
11 Jul 1972 @ 14255m 20h 1m
10 Jul 1972 @ 18246h 59m
10 Jul 1972 @ 112523h 59m
09 Jul 1972 @ 11267m 19h 3m
08 Jul 1972 @ 16233m 4h 12m
08 Jul 1972 @ 12115m 2d 2h 9m
06 Jul 1972 @ 100221h 52m
05 Jul 1972 @ 1210 ie3d 18h 10m
01 Jul 1972 @ 18001d 4h 45m
30 Jun 1972 @ 13157d 2h 55m
23 Jun 1972 @ 10205d 20h 35m
17 Jun 1972 @ 1345 ie281d 19h 39m
09 Sep 1971 @ 180661d 1h 22m
10 Jul 1971 @ 16441y 21d 3h 44m
19 Jun 1970 @ 13003h 50m
19 Jun 1970 @ 0910306d 15h 25m
16 Aug 1969 @ 1745 ie4d 1h 5m
12 Aug 1969 @ 16401d 22h 45m
10 Aug 1969 @ 1755 ie5d 2h 0m
05 Aug 1969 @ 15556h 10m
05 Aug 1969 @ 0945 ie14d 17h 15m
21 Jul 1969 @ 1630 ie7d 23h 10m
13 Jul 1969 @ 1720 ie7h 20m
13 Jul 1969 @ 1000 ie20d 19h 0m
22 Jun 1969 @ 1500295d 21h 45m
30 Aug 1968 @ 17156d 6h 15m
24 Aug 1968 @ 11004d 22h 15m
19 Aug 1968 @ 12458d 1h 30m
11 Aug 1968 @ 11156d 18h 25m
04 Aug 1968 @ 165042m
04 Aug 1968 @ 16086d 23h 53m
28 Jul 1968 @ 16154d 2h 25m
24 Jul 1968 @ 13501h 35m
24 Jul 1968 @ 12152d 19h 10m
21 Jul 1968 @ 17055d 23h 25m
15 Jul 1968 @ 174040m
15 Jul 1968 @ 170023h 0m
14 Jul 1968 @ 18004d 20m
10 Jul 1968 @ 174023h 45m
09 Jul 1968 @ 175514d 2h 0m
25 Jun 1968 @ 15551h 30m
25 Jun 1968 @ 14251h 35m
25 Jun 1968 @ 12502h 29m
25 Jun 1968 @ 102122h 21m
24 Jun 1968 @ 120019h 25m
23 Jun 1968 @ 16352h 29m
23 Jun 1968 @ 14062h 34m
23 Jun 1968 @ 11324d 37m
19 Jun 1968 @ 1055 ie1d 23h 55m
17 Jun 1968 @ 110019h 35m
16 Jun 1968 @ 15251h 2m
16 Jun 1968 @ 142338m
16 Jun 1968 @ 134517m
16 Jun 1968 @ 13281h 43m
16 Jun 1968 @ 11451h 45m
16 Jun 1968 @ 10004d 18h 15m
11 Jun 1968 @ 1545

Interval Statistics

Interval Count84
Min2m
Max14y 310d 14h 59m
Mean134d 21h 24m
Median2d 1h 2m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
7642 26 Jun 1986 @ 1800 --- research-mab 6-26-1986 Fan Geyser – Dormant, full & overflowing slightly opalescent water. Stromatolite growth forms around vent are all dead & silicified. T=193º
7605 11 Feb 1984 @ 1800 --- research-mab 02/11/1984 Fan Geyser – 29ºC Water flowing in from east, Yellow l. brown algae in vent.
7666 31 Aug 1983 @ 1800 --- research-mab 8-31-83 Fan G Quiet, water flowing in. 36ºC
5086 24 Jun 1980 @ 1800 --- research-mab 06/24/1980 Fan Geyser was seen in eruption today.
5144 27 Sep 1979 @ 1800 --- research-mab 09/27/1979 Fan – 201ºF clear water, but lower level
5004 20 Sep 1979 @ 1800 --- research-mab 09/20/1979 Disturbance Fan Geyser – erupting to 1 foot with a noisy boil. No overflow 200ºF
5939 25 Mar 1973 @ 1800 --- research-mab 03/25/1973 Fan {no time} The periods of minor play this evening was generally 10-15 seconds in duration and seemed to indicate that an eruption of Fan was imminent. During a half hour of close observation (until it got dark) the intervals between periods of minor play with heavy runoff were as follows: 2m30s, 1m45s, 1m50s, 2m35s, 1m15s, 0m35s, 3m10s, (Africa and Fireball start up), 4m35s, 0m40s, 1m20s, 3m20s, 2m55s, 0m30s (Africa&Fireball active) It is quite probable that Fan may have played within the last half hour. (Ave of 13 intervals: 125 sec, range 30-275 sec)
6505 15 May 1972 @ 1800 --- research-mab 05/15/1972 Fan – plays 1’-3’ frequently 199º
6307 14 May 1972 @ 1800 --- research-mab 05/14/1972 The following geysers have been seen erupting since I arrived last night: Ledge 6-10’, Iris 2-3’, Little Whirligig 15’, Basin 1’-2’, Fan 4’-5’, Bear Den, Feisty, Fireball 2-3’, Minute 1’-2’, Blue 7-15’, Africa 25-35’, Vixen 7’-15’, Dr Morey’s Porkchop 3’-5’, Echinus 10’-40’, Steamboat 5-20’
7672 12 Aug 1970 @ 1800 --- research-mab 08/12/1970 Much activity in Porcelain in late pm (6-7) Arsenic, Fireball, and Fan went off in succession. 8/12/1970 Dark Cavern had extended eruption also.
7497 09 Jul 1969 @ 1200 --- research-mab 07/09/1969 Fan putting out small amounts of H2O all morning.
EntrySourceLinkComment
21 Jun 1994 @ 1517 JSJ https://www.youtube.com/watch?v=s8IaOePjk4s Video by David Schwarz of Fan Geyser's mid-afternoon eruption on 21 June 1994.
Baseline does not exist.