[Geysers] More on East Sentinel

David Schwarz david.schwarz at alumni.rice.edu
Thu Nov 11 17:00:55 PST 2010

   That's interesting.  A little less than an hour before the first eruption
I saw in 2001, I was seeing big steam puffs from the picnic table at F&M.
What Steve described might have been enough to do that--it was a cool day.
Anyway, I decided to wander over and take a look at it.  The evening
lighting was bad for seeing into the crater, but from what I could tell,
while I was there, it was gently fizzing on one edge the way it had been all
summer, and was slightly below overflow.  Nothing looked out of place, and
F&M were due to start a new cycle, so after a few minutes I headed back.  I
felt like an idiot when I looked back a while later and saw the steam cloud.

   It sounds like East Sentinel sometimes has at least an hour or two of
unusual activity before erupting.

David Schwarz

On Thu, Nov 11, 2010 at 11:34 AM, Stephen Eide <stepheneide at cableone.net>wrote:

> Greetings and Salutations,
> To add to Tara's data, I did visit East Sentinel about an hour or hour and
> a half before the eruption on the way to Artimesia.  Then I was a few
> seconds behind Tara in seeing the eruption and I did sit on it for about an
> hour and a half a few hours after the eruption.
> At that time I was walking to Artimesia  before the eruption East
> Sentinel was boiling as strong as I have seen, the upper part of  the boil
> was six inches to may be a foot and a half over the sinter rim.  I only
> watched for a few minutes however.
> When I reached East Sentinel during the eruption I saw one burst from a
> distance that looked to be 10-15 feet maybe, I saw it from the Artimesia
> trail.  When I got down to East Sentinel the max height was maybe ten feet
> and quickly dropped to three to six feet.  Using the top picture of Tara's
> for naming the vents, Sentinel's Vents were not active except to make noise
> but the side vent/drain hole was erupting strongly to 10-15 feet.  There was
> a clear area of wash from East Sentinel to about 15-20 feet up the small
> water course that makes East Sentinel an island.  I have pictures also, but
> they are exactly like Tara's.  After the eruption was over East Sentinel
> appeared to be empty as best as I could see.
> When I went back a few hours later East Sentinel was going through cycles
> of increasd boiling, again six inches to over a foot above the sinter rim,
> these occured about every five to ten minutes from peak boiling to peak
> boiling.  After the strong boiling stopped the pool in East Sentinel dropped
> below overflow.  Also at that time Sentinel's vent would start a loud
> boiling deep in the holes with no water or droplets visible on the surface.
> The side vent/drain hole did nothing during these boils.  I'll send more if
> I think of anything else.
> Stephen Eide
>   On Thu, Nov 11, 2010 at 1:22 AM, Tara Cross <fanandmortar at hotmail.com>wrote:
>>   >2. I'm quite certain that the "side vent" described with this activity
>> is/are the same as what I put into my book's 4th Edition as "UNNG-MGG-2
>> ("Sentinel's Vents")". The >eruptions I saw in 2004 and 2005 were
>> independent of anything more than the normal boiling in East Sentinel
>> itself.
>> As I said before, the side vent I am talking about is actually in the
>> channel that flows between East Sentinel and the embankment.  I have
>> attached some pictures to show its location.  You can also see it on the
>> YouTube video Dave Monteith posted.  If "Sentinel's Vents" participated in
>> the eruption, it was before I arrived at the scene.
>> Clark Murray and David Schwarz have both reported that they did not see
>> this vent erupt when they witnessed eruptions of East Sentinel in 1991 and
>> 2001, respectively.  I didn't get a year for the eruption Mike Keller saw
>> that included the side vent.  I believe this is the vent described as a
>> drain hole by Murray.
>> --Tara Cross
>> fanandmortar at hotmail.com
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