[Geysers] Re: Geyser report 17-21 Aug (Bower)

[Ralph Taylor]

>From Ralph Taylor 22 August 2004

 

Gordon Bower wrote:

 

Depression was usually seen once per day. The one day it was seen twice,

the eruptions were just under 11 hours apart. The other days, the observed

eruptions were remarkably close to 22 hours apart. It *might* really be

very regular at the moment (or it might still be wildly erratic): Ralph,

hopefully, will reveal all in due time.

 

Well, I can't reveal ALL, but Depression has been increasing its intervals
steadily since 1998, when intervals

were around five to six hours.  The intervals climbed to nearly nine hours
(average) by mid-2002, then sharply

decreased at the time of the Denali quake.  Since November of 2002 the
intervals have been climbing steadily

and the incidence of REALLY long (over 14 hours) intervals went from one or
two per year in 2001 and 2002 to

nearly a dozen this year.

 

Since late June intervals have been slowly increasing, varying between nine
and fourteen hours but typically 

between ten and eleven hours.  Wind seems to have a greater effect than in
the past, possibly because

of Depression Geyser losing some of its energy and/or water supply and
therefore being almost at the point 

of erupting for a longer time.  During the time of Gordon's report (17-21
August) intervals varied from just 

under ten hours to 13 hours.  For those days the eruption times were:

 

            Eruption time        Interval

 


17-Aug-04 02:44:03

13:46:00


17-Aug-04 12:37:03

9:53:00


17-Aug-04 23:31:03

10:54:00


18-Aug-04 10:55:03

11:24:00


18-Aug-04 22:39:03

11:44:00


19-Aug-04 08:29:03

9:50:00


19-Aug-04 18:59:03

10:30:00


20-Aug-04 05:37:03

10:38:00


20-Aug-04 18:36:03

12:59:00


21-Aug-04 04:37:03

10:01:00

 

There was only one North Goggles eruption during Gordon's stay, on 19 August
at 1858.

 

Lion is having series anywhere from five to fifteen hours apart.  I haven't
noticed any more (or less) variability

In recent years.  As far as I can tell, the bubblers have been useless as
indicators for a few years now.  

 

Little Cub is having long periods of splashing without really erupting in
the night and early morning hours; this 

started last fall and continues to date.  Some intervals between actual
eruptions have been in excess of six hours, 

but none of these has occurred after mid-morning.  There seems to be a lot
more water flowing from some crevices

between laminations of Little Cub's end of the mound lately.  Although Lion
is having series with up to six eruptions 

(including minor eruptions), it is still the case that 60% of the series
have two eruptions.  Incidentally, the long series

Intervals generally have been extended by a large preplay splash out of
Lion, which seems to delay the 

subsequent initial by an hour or two.

 

I've probably said too much!

 

Ralph

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