<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=US-ASCII"> <TITLE>Message</TITLE> <META content="MSHTML 6.00.2900.2604" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #ffffff"> <DIV><SPAN class=421342803-11042005>Scott,</SPAN></DIV> <DIV><SPAN class=421342803-11042005></SPAN> </DIV> <DIV><SPAN class=421342803-11042005>Good questions!  By the way, I today received the next set of downloads, so it is back to the keyboard.  Unfortunately the logger on Beehive has gone missing (critter attack, we think), so no more data there after the 28 February data.  I have an article in the upcoming Geyser Gazer SPUT with more data, discussion, and some of the graphs so that may help explain what is going on.</SPAN></DIV> <DIV><SPAN class=421342803-11042005></SPAN> </DIV> <DIV><SPAN class=421342803-11042005>My answers are interleaved below.</SPAN></DIV> <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT face=Tahoma>-----Original Message-----<BR><B>From:</B> geysers-bounces@wwc.edu [mailto:geysers-bounces@wwc.edu] <B>On Behalf Of </B>TSBryan@aol.com<BR><B>Sent:</B> Sunday, April 10, 2005 21:06<BR><B>To:</B> geysers@wwc.edu<BR><B>Subject:</B> [Geysers] Geyser data summary<BR><BR></FONT></DIV> <DIV>I hope people have paid attention the latest summary of geyser data (1-1 to 2-28-2005) posted by Ralph Taylor... but by way of that, I point out and also I query Ralph on the following:</DIV> <DIV> </DIV> <DIV>1. Noted before, Beehive having an interval as long as 43h 18m, and averaging 21h 18m.<SPAN class=421342803-11042005> </SPAN></DIV> <DIV><SPAN class=421342803-11042005></SPAN> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>The long interval occurred on 16 January in a string of long intervals starting on 13 January.  Intervals dropped to below 24 hours by 20 January and generally remained between 15 and 22 hours until 8 February when they began fluctuating between 15 and 28 hours until the end of the data.</FONT> </SPAN></DIV> <DIV> </DIV> <DIV>2. Little Cub with an interval of 44h 23m. Remarkable. Ralph says he's sure it's real. And note that even with that, the median interval is still as low as 57m.</DIV> <DIV> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>There were many periods lasting most of a day where Little Cub would have 50-60 minute intervals--70% of all intervals were under 66 minutes, hence the low median.  Another 10% of the intervals were between 90 and 120 minutes, and just 2% were over 12 hours (18 intervals), seven of these were over 20 hours.   Incidentally, Plate Geyser has also begun to have long periods of inactivity separating sets of five to 10 "normal" intervals of around three hours.</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005> </SPAN></DIV> <DIV><SPAN class=421342803-11042005> </SPAN>Oblong -- an interval of just 37 minutes. Yay -- a series. First I recall hearing of in several years. Oh, but 'sob', also an interval of 19h 41m.</DIV> <DIV> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>The really long Oblong interval could well have been a missed eruption or two as the temperature curve is flat at zero degrees C (freezing) suggesting ice dams.  Oblong has been having sets of eruptions four or so hours apart separated by longer intervals for some time now but I hesitate to call that behavior series behavior.  The 37 minute interval is real, and is almost certainly the old series behavior.  The good news is that fully 90% of the intervals in January and February were between 3 and 6 hours, with nearly 75% being between 3h30m and 5h30m.</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff></FONT></SPAN> </DIV> <DIV>DAISY -- tell me Ralph -- can that long interval of 16h 32m really be correct? Might there have been ice build up, or something?</DIV> <DIV> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>There could have been ice buildup, I suppose, but the temperature remained above freezing at the sensor for much of the 16 hours, and the shape of the curve (slow cooling after the last eruption then a slow rise suggestive of overflow) makes me think the long interval was real.  The one on 8 January is not so definitive and could have been the result of an ice dam.  There were three intervals over 12 hours, all of them having short intervals (around 3 hours) before and after.  Well, the 10h50m interval on 13 January followed a 6h14m interval, but the one before that was 3h45m and the one after was 2h46m.</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff></FONT></SPAN> </DIV> <DIV>Grotto shows an interval of 46h 21m. Does the electronic data indicate that this was the interval following a marathon?</DIV> <DIV> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>Yes, the 46h21m interval followed a 29h12m marathon eruption (the longest duration so far in 2005).</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff></FONT></SPAN> </DIV> <DIV>And last, Artemisia ranges all the way from 8h 14m to 25h 50m. The mean is 16h 16m. The question is, are the intervals widely scattered in that range, or are most clustered fairly near 16 hours?</DIV> <DIV> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>Artemisia has had varying intervals.  In January for three weeks intervals fluctuated widely (up to 24 hours) but were not consistent at all with the shortest interval of 2005 in that three week period.  From about 25 January to the end of March most intervals were between 14 and 18 hours with a lot of variation.  I'm tempted to say there was a pattern, but it was not definite.  For example, around 13 February successive intervals were 14h00m, 18h31m, 13h21m, 14h16m, 17h48m, 16h30m, 14h43m, 20h36m, 14h18m.  These form sort of a sawtooth graph, but not regular enough to be terribly helpful in predicting the next eruption.</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff></FONT></SPAN> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>Between 8 March and 8 April 56% of the intervals were between 13h30m and 17h30m, if that helps.</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff></FONT></SPAN> </DIV> <DIV>Thanks, Ralph.</DIV> <DIV> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>Happy to have interested readers!</FONT></SPAN></DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff></FONT></SPAN> </DIV> <DIV><SPAN class=421342803-11042005><FONT color=#0000ff>Ralph</FONT></SPAN></DIV> <DIV>Scott Bryan</DIV></BLOCKQUOTE></BODY></HTML>