[Geysers] Grand without Grand?

Pat Snyder riozafiro at gmail.com
Mon May 21 05:46:01 PDT 2012


Thank you ever so much, Mary Beth. I appreciate that you are sharing your extensive knowledge about Grand!
This is really interesting and makes it is worthwhile to stick around a while after Grand has erupted. 
Pat Snyder



On May 19, 2012, at 8:27 PM, Mary Beth Schwarz wrote:

>      The afterplay splashing always occurs after Grand erupts whether Turban & Vent Continue or Quit.  If T&V have to restart, the afterplay from Grand's empty crater starts quickly after the restart.  If T&V Continue after Grand, the afterplay usually begins at about 14-15 minutes after the end of Grand, but if the afterplay begins sooner (about 3-8 minutes or so) then the splashing may be taller and there could be a chance for an Afterburst - a full-sized approx 100 foot or more burst.  The Afterbursts are almost always after an eruption of Grand with 2 or more bursts where Turban and Vent Continue and the afterplay splashes begin quicker than normal.
> 
>      There has been only one observed eruption of Grand that was a single burst that had an Afterburst on 31 July 2009 at 1458(T1+1C).  It had a long try at a second burst, but the pool suddenly drained, so we were quite disappointed.  T&V Continued and very soon we had huge afterplay that built quickly into an Afterburst.  It was an unusual situation so we had an unusual Afterburst.  There was a bit of screaming for that one!
> 
>      After an Afterburst it is good to keep watching the afterplay in case there are more Afterbursts.  I believe that the last multiple Afterbursts were in the 1980s but I would have to look that up in some old notes to be certain (or check with the Strassers).
> 
>      Grand and its group can do many interesting things, so it is always fun to watch.  The data I have collected about Grand is from 1991 to the present, so that is the basis for my answer to Pat's question.
> 
>      Mary Beth Schwarz
> 
> On Sat, May 19, 2012 at 11:52 AM, Pat Snyder <riozafiro at gmail.com> wrote:
> 
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