<HTML><HEAD> <META charset=US-ASCII http-equiv=Content-Type content="text/html; charset=US-ASCII"> <META content="MSHTML 6.00.2800.1498" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #ffffff"> <DIV> <DIV>In a message dated 10/22/2005 17:01:13 PM Pacific Daylight Time, jacross@lamar.ColoState.EDU writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT face=Arial>Has anybody watched Riverside to determine if before the long eruptions it<BR>shows a disturbance at the 6-hour mark?<BR><BR>Has anybody ever timed the durations to see if they are longer following a<BR>long interval?<BR><BR>I believe John Wegel studied Riverside years ago, but what happened to the<BR>data he collected?</FONT></BLOCKQUOTE></DIV> <DIV> </DIV> <DIV>My opinion is that Riverside undergoes cyclic hotter-colder periods during it overflow (probably actually at all times), and it is during a hotter spell that it will erupt. Often enough it "tries" but fails, and it is just such an event that might be called a "disturbance at the 6-hour mark."</DIV> <DIV> </DIV> <DIV>[But OH, PLEASE, don't use the term "disturbance" here, as it is too well entranced for those large-scale events at Norris, etc.]</DIV> <DIV> </DIV> <DIV>I don't think there's a significant difference in duration, but I certainly haven't timed it. Given the sometimes-uncertainly as to the precise start of an eruption plus its gradual ending lapse from water-to-steam, this might be a difficult task to accomplish with any reliability.</DIV> <DIV> </DIV> <DIV>Did Wegel ever provide his data to the NPS. I know he did provide results, as they were used by Hutchinson in one or more of his annual reports. But the data itself -- all those wonderful microdays and such...? Is Wegel still in Bozeman?</DIV> <DIV> </DIV> <DIV>Scott Bryan</DIV></BODY></HTML>