[Geysers] More Oblong series--1988 Landis Report

[Ralph Taylor]

I looked back at some temperature files from 1998 and 2000.  The series of
eruptions show very clearly.  I'll try to get the data better organized and
charted and post some of the graphs.  The analysis I ran some years ago
showed series of 1, 2, or 3 eruptions from 15 July to 15 September, then
longer series of up to 6 eruptions in September to the end of data in early
October of 2000.  For 67 series recorded in 2000 series intervals ranged
from 14h28m to 73h25m, and in-series intervals from the initial eruption to
the second ranged from 2h27m to 6h28m for 50 series.  The mean and median
1-2 intervals were 3h05m and 3h01m respectively.  The statistics  for the
2-3 interval (11 examples) were similar, with a range of 2h41m to 5h12m,
mean and median values of 3h13m and 3h02m respectively.

The 1998 data needs more analysis, but it looked at first glance like the
series behavior occurred late in the summer.  There is no 1999 electronic
data that I can find.  The 2001 data looks like non-series behavior with
intervals around 3 hours and occasional gaps that look like double
intervals.

Ralph Taylor
On Fri, Jun 10, 2011 at 9:43 PM, Lynn Stephens <lstephens2006 at hotmail.com>wrote:

> Here's part of what Phil Landis wrote in his 1988 report:
>
> "These initial eruptions of a possible series of eruptions lated an average
> of 7 minutes...The second eruption of a series followed in an average
> 2h14m...These eruptions usually occurred from a pool level near rim top
> though on occasion from a level 1-2 feet down or an on overflowing pool.
> Second eruptions of a series were generally stronger than the first and had
> a longer average duration of 8 minutes.  the eruption form was the same as
> the initial eruption.  Third eruptions of a series followed the second after
> an average interval of 35 minutes, and had durations of only 6 1/2 minutes.
> Now the pool took 3-4 hours to recover to near rim top.  during the first
> half of the summer there was only one eruption per series.  From August on
> there was the possibility of a second or maybe even a third eruption, though
> the single eruptions were still most common.  The average interval between
> observed series (start to sarts) was 25 hours (page 292).  "Known" intervals
> were visually obtained or obtaioned through use of markers, and their
> average was 26 hours.  Note the random bell-shaped curve to the intervals,
> and yet I assume that some connection exists with Giant, but I have no proof
> so far."
>
> Phil did not include any comments about Oblong in his 1987 report.
>
> Lynn Stephens
>
> ------------------------------
> From: TSBryan at aol.com
> Date: Fri, 10 Jun 2011 11:03:37 -0400
> To: geysers at lists.wallawalla.edu
> Subject: [Geysers] More Oblong series
>
> As was suggested, the early issues of The Sput contain a bit of info about
> Oblong erupting in series. The following is from 1988 (I failed to check
> just which issue -- sorry):
>
> Oblonq -- Enjoyably Erratic
> Oblong is typically ranging from 24 to 48 hours between eruptive
> episodes. The average interval is likely near 30 hours. I say"episodes"
> because when there is one eruption, there may be a second and third.
> As seen in 1986-87, the interval between the first and second play is
> typically around 2-2 1/2 hours; the next interval, when it happens (and
> it usually does not) is of 28-42 minutes. Interestingly, the majority
> of eruption series have occurred near the time of something by Giant,
> and is therefore believed to serve as something of an indicator worth
> watching for.
>
> Scott Bryan
>
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