[Geysers] Riverside's bimodality

[Ralph Taylor]

The electronic record does not contain enough information to determine
eruption duration, and I have not personally timed any durations recently.
I have not looked at the temperature trace for indications of unusual
activity at the 6-hour mark, but I will try to do so for some cases as soon
as I can.  

It is the case that nearly all of the variation is in the overflow time, as
Lynn Stephens pointed out to me a couple of years ago.  I certainly would
not be surprised to find out that there is some sort of increase in
overflow, temperature, boiling, or other indication of increased readiness
for a eruption at the six hour mark, since we often see such indications of
an "aborted eruption" in other geysers.  I am thinking of phenomena like big
preplay splashes in Old Faithful (often seen near the predicted eruption
time on long intervals) or big preplay splashes that delay Lion initial
eruptions, or delays at Grand.

Ralph

-----Original Message-----
From: geysers-bounces at wwc.edu [mailto:geysers-bounces at wwc.edu] On Behalf Of
Jeffrey Cross
Sent: Friday, October 21, 2005 23:49
To: geysers at wwc.edu
Subject: [Geysers] Riverside's bimodality


Riverside Geyser is known to erupt at intervals of (currently, per Ralph's
posted data for 2005) every 6h04m or every 6h42m.  The two intervals occur
in a ratio of 2.3 to 1, favoring the short mode.

Has anybody watched Riverside to determine if before the long eruptions it
shows a disturbance at the 6-hour mark?

Has anybody ever timed the durations to see if they are longer following a
long interval?

I believe John Wegel studied Riverside years ago, but what happened to the
data he collected?

Jeff Cross
jacross at lamar.colostate.edu
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