<html> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 10 (filtered)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=blue> <div class=Section1> The photos are quite nice, but hydrothermal explosion?  I think not-the photo looks like the eruptions of Black Diamond I saw in 2007 and 2008-muddy, filled with sinter, rocks, and lots of silt.  My impression each time I have seen it is that there isn’t much of a plumbing system/geyser vent that the eruption is coming from.  Does that constitute a hydrothermal explosion versus an eruption?  I would say this is an eruption, especially since the area has a history of doing it in the past 3 years, plus other events in the early 1910’s, 1920’s, 1930’s, 1940’s, and 1950’s.  I would even dare to speculate that the source of energy that drove Black Diamond/Wall Pool in these years moved to Sapphire Pool after the 1959 earthquake and is just now returning back to the Black Diamond area.   Maybe I am wrong, but my impression/definition of a hydrothermal explosion is an area that has a large explosion or one time event, not a history of eruptive activity.   MK   -----Original Message----- From: geysers-bounces@lists.wallawalla.edu [mailto:geysers-bounces@lists.wallawalla.edu] On Behalf Of Jack Ashe Sent: Monday, May 25, 2009 8:14 AM To: Geyser Observation Reports Subject: Re: [Geysers] Photograph of Black Diamond eruption (Stephens)   <div> <div> Hydrothermal or not, that is the quesiton! </div> <div>   </div> <div> Isn't the assertion in the article that this was not a geyser eruption but rather a hydrothermal explosion resulting in geologic effect similar to the Pocket Basin explosion crater, Indian Pond or the Duck Lake events? </div> <div> Was this NOT a true hydrothermal explosion but just a "messy" geyser eruption?  </div> <div>   </div> <div>  If it is a hydrothermal explosion, I have been informed that these probably result  from a sudden drop in water pressure over the thermal source. Did that occur at Black Diamond?? </div> <div>   </div> <div> Jack   </div> <div>   <div> <div class=MsoNormal align=center style='margin-left:.5in;text-align:center'> <hr size=1 width="100%" align=center> </div> From: "TSBryan@aol.com" <TSBryan@aol.com> To: geysers@lists.wallawalla.edu Sent: Sunday, May 24, 2009 4:35:27 PM Subject: Re: [Geysers] Photograph of Black Diamond eruption (Stephens) <div> <div> Need I point out the errors in this article. I hope the source wasn't in-park... but as we all know, Black Diamond has had quite a few eruptions... and above all, the statement that there are no geysers at Biscuit Basin......... Well ? </div> <div>   </div> <div> Scott Bryan </div> <div>   </div> <div> In a message dated 5/24/2009 12:56:37 AM Mountain Daylight Time, david.schwarz@gmail.com writes: </div> <blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt; margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'> There's another photo of the explosion in the Jackson Hole News, along with a write-up: <a href="http://www.jacksonholenews.com/article.php?art_id=4624" target="_blank" title="http://www.jacksonholenews.com/article.php?art_id=4624" rel=nofollow>http://www.jacksonholenews.com/article.php?art_id=4624</a> </blockquote> </div> <div id=dc0da6ba2bff5ff1d0d4b897132eac26>   <div class=MsoNormal align=center style='margin-right:0in;margin-bottom:0in; margin-left:.5in;margin-bottom:.0001pt;text-align:center'> <hr size=2 width="100%" align=center> </div> An Excellent Credit Score is 750. <a href="http://pr.atwola.com/promoclk/100126575x1221322948x1201367184/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=MayExcfooterNO62" target="_blank" rel=nofollow>See Yours in Just 2 Easy Steps!</a> </div> </div> </div> </div>   </div> </body> </html> Internal Virus Database is out of date. Checked by AVG - www.avg.com Version: 8.5.283 / Virus Database: 270.12.20/2100 - Release Date: 05/06/09 06:04:00