[Geysers] Geyser Report--Stephens (8.2

[lynn stephens]

My analysis of  Great Fountain intervals (based on visual observations) from May 28 through August 1 shows:

69 closed intervals
26 double intervals
1 triple interval

Mean of both the 69 closed intervals and all the intervals is 12 hours 4 minutes.  The median of the 69 closed intervals is 11 hours 49 minutes.  Intervals varied from a minimum of 9 hours 22 minutes to a maximum of 15 hour 06 minutes.

Distribution of Great Fountain intervals:
    Less than 10 hours   1%
    10h0m - 10h59m      23%
    11h0m - 11h59m      38%
    12h0m - 12h59m      14%
    13h0m - 13h59m      13%
    14h0m - 14h59m       7%
    >=15h0m              3%  

I've been watching Atomizer Geyser for the past two weeks.  (Dean Lohrenz, Dave Leeking, and possible others recorded some Atomizer major to major intervals in late June-early July, but I haven't finished typing the June and July logbooks yet, so I haven't included those intervals in this analysis.)

>From July 20 through August 2, I've recorded 3 closed intervals, 8 double intervals, and 1 triple interval.  The overall mean interval is 14h12m.  The longest interval is a closed interval of 15h57m.  The "shortest" interval is a double of 26h25m, which results in one interval at least as short as 13h12m.  The proportion of "quick comeback" majors (a major happening 5 to 15 minutes after the preceding minor) continues to increase compared with prior years.  Six (43%) of the 14 major eruptions that I've seen were "quick comeback" majors.

Till Geyser finally exceeded the 11 hour interval mark.  Unfortunately, I didn't get the closed interval, but the double interval of 22h08m meant at least one of the closed intervals had to have exceeded 11h04m.

Seismic Geyser is having periodic activity in the form of heavy overflow, which puts up an impressive steam cloud, but I haven't seen any bursting accompany the heavy overflow periods.  The overflows have been occuring at 18-22 minute intervals, and last 1-2 minutes.

Lynn Stephens 


  
 
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