<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple id="role_body" bottomMargin=7 leftmargin=7 topmargin=7 rightMargin=7> <div class=Section1> Allan – <o:p></o:p> <o:p> </o:p> In some years there is only a few hours between the end of a marathon – even a long one – and the recovery hot period of Giant.  And this is not a good thing.  There’d be a nice 18 hour marathon and then a measly 4 minute hot period only 2 or 3 hours later.   We’d hope/pray that it would hold off, but no.<o:p></o:p> <o:p> </o:p> This year, the long delays between marathon end and subsequent hot period is a nice change.  I think most people recognize that the longer, the better, and the very long marathons have provided the longest interval til the next hot period.  If you go back through the listserv data (and perhaps on the gosa website) the data is ther.<o:p></o:p> <o:p> </o:p> But over the past decade or so there really isn’t a duration/interval relationship.  Some years, it’s short.  Some years, like this year, it’s longer.  And longer is better.<o:p></o:p> <o:p> </o:p> Paul Strasser<o:p></o:p> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: geysers-bounces@wwc.edu [mailto:geysers-bounces@wwc.edu] On Behalf Of Moose, Allan E. Sent: Wednesday, August 30, 2006 9:44 AM To: <st1:PersonName w:st="on">geyser observation reports</st1:PersonName> Subject: Re: [Geysers] Grotto discharge<o:p></o:p> </div> <o:p> </o:p> I have some thoughts on Scott's back of the envelop calculation below. It seems (to me)  plausible that a Grotto marathon removes water from the interstices below Giant and its associated geysers. Because water is an effective absorber of heat (that's why it's used in car radiators) and air isn't, the result is that the rocks around the interstices will increase significantly in temperature. (Think of what happens to your car when a radiator hose breaks.) Thus, when water fills in the voids after Grotto ends, there is more energy available for the recovery hot period and/or a Giant eruption.<o:p></o:p>  <o:p></o:p> Now, I have a question: Is the data available to do a linear regression on the length of Grotto marathons and the time from Grotto's shut down to the recovery hot period?<o:p></o:p>  <o:p></o:p>  <o:p></o:p> Allan Moose<o:p></o:p>  <o:p></o:p>  <o:p></o:p> "Science is just organized curiosity"<o:p></o:p> (Donald Kroodsma)<o:p></o:p>   <o:p></o:p> <o:p> </o:p> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabIndex=-1> </div> From: geysers-bounces@wwc.edu [mailto:geysers-bounces@wwc.edu] On Behalf Of <st1:PersonName w:st="on">TSBryan@aol.com</st1:PersonName> Sent: Monday, August 28, 2006 4:04 PM To: geysers@wwc.edu Subject: [Geysers] Grotto discharge<o:p></o:p> <div> An idle thought that likely is nothing more than that. But the other day Ralph Taylor wondered about the discharge volume of Grotto Geyser. Looking at Marler's Inventory, Marler cites a value of 670 gallons per minute -- that strikes me as being precise enough as to have been determined by actual measurement.<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> OK, so... do some multiplication and you find that a 33-34 hour long Grotto marathon -- about as long as they ever can be -- will discharge something around 1,000,000 gallons. And of course, the commonly-cited value of discharge during a Giant eruption is 1,000,000 gallons.<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> So, Grotto has a long marathon, discharging 1,000,000 gallons from the entire Grotto-Giant system. That volume is regained during the hours leading up to Giant's recovery hot period, which as we know frequently results in a Giant eruption. So...<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> ... now you carry the thought onward.<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> Scott Bryan<o:p></o:p> </div> </div> </body> </html>