[Geysers] Grand without Grand?

[Mary Beth Schwarz]

     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:

> Thank you Mary Beth and David for the explaining this after-eruption
> action at Grand. I've also seen these afterplay bursts and they are lots of
> fun! It's like a bonus eruption.
>
> I have an additional question. Does this afterplay always occur? Or is it
> more likely from a multi-burst eruption of Grand? I have seen afterplay
> that's quite tall, maybe to 40-50 feet (very cool), but only after
> two-burst eruptions. Also, true afterBURSTS (much taller and larger water
> volume) also are more likely after multi-burst eruptions, too, correct?
> Thanks for any explanation folks can offer...
>
> Very interesting, regardless! Thanks for asking, Janet. I need to hang out
> longer after Grand!
> Pat Snyder
>
>
> On May 19, 2012, at 8:03 AM, Mary Beth Schwarz wrote:
>
>      Janet, thanks for reporting something you had not seen before. You
> never know whether it might be something very unusual or alternatively just
> something new to you.  The geysers can do strange and wonderful things for
> us!
>
>      What you described sounds like AFTERPLAY at Grand.  When Grand erupts
> and then finishes its eruption, Turban and Vent either Continue for about
> 20 to 45 minutes (or longer) or they Quit and then must restart, which can
> take from about 3 minutes to over 25 minutes (during which the Grand area
> is quiet),  and erupt for a while after Grand.  It is also possible for
> Turban and Vent to have an extra restart after the first one and that is
> usually when there are longer intervals of Grand.  If T&V Restart, Turban
> usually begins first and Vent joins in.  Either way (Continue or Quit),
> there will be sparkly afterplay splashes from Grand's empty crater with a
> little left over water in the system during part of the T&V eruption after
> Grand just as you saw.
>
>      Many times I have encouraged people to stay after Grand finishes to
> see this lovely splashing, and I do remember the first time I saw it and
> thought it was remarkable and beautiful.  It is still fun to watch even
> after all the years.
>
>      Mary Beth Schwarz
>
> On Fri, May 18, 2012 at 10:22 PM, Will Boekel <wolveslax65 at comcast.net>wrote:
>
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