<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=US-ASCII" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 8.00.6001.18999"></HEAD> <BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document color=#000000 size=2 face=Arial> <DIV>Two interesting (?) points about the Steamboat periodicity, beyond the fact that it certainly appears to be real and startlingly regular:</DIV> <DIV> </DIV> <DIV>1. It should be noted that while the temperature drop is relatively sudden, the recovery of temperature is much more gradual, taking the better part of a day,<FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial> making it apparent that this is not some simple on-off event. It would be really interesting to know if there is any sort of chemical change (such as sulfate-chloride) involved. (I really like the idea of a deep-seated cyclic process and, sorry, but cannot help but think of the "Geyser Hill Wave.")</FONT></DIV> <DIV> </DIV> <DIV>2. Though it most likely is coincidental, there appears to be a somewhat similar cyclic temperature change at Opalescent Spring, another feature that is chloride-rich and so presumably with water of deeper origin (as is, presumably, Steamboat).</DIV> <DIV> </DIV> <DIV>Scott Bryan</DIV> <DIV><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial></FONT> </DIV> <DIV><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>-----Original Message-----<BR>From: geysers-bounces@lists.wallawalla.edu<BR>[mailto:geysers-bounces@lists.wallawalla.edu] On Behalf Of Davis, Brian L.<BR>Sent: Sunday, January 02, 2011 5:38 PM<BR>To: geysers@lists.wallawalla.edu<BR>Subject: [Geysers] Long-term periodicities at Steamboat (& elsewhere)?<BR><BR>Looking at the Steamboat temperature log here:<BR><BR>http://volcanoes.usgs.gov/yvo/activity/monitoring/norris/steamboat.php<BR><BR>I noticed something I'd never known before (I know, there's a LOT I don't<BR>know) - Steamboat seems to have a nicely periodic 4.5 day cycle (most easily<BR>seen in the monthly graph). That surprised me, and got me thinking about<BR>what could do that, as well as when in the cycle a major is most likely to<BR>happen. Is there any information on this?<BR><BR>While on the subject of long-term cycles, what others are known? I realize<BR>Giant hot periods might fit in this category, but I'm not sure what else<BR>might? Annual cycles might be related to seasonality, but certainly this<BR>doesn't explain things like a 4.5 day cycle.<BR><BR>-- <BR>Brian Davis<BR></DIV></FONT></FONT></BODY></HTML>