Activity in 2011

Activity in 2010


Activity Recorded by Data Logger  by Ralph Taylor 



Introduction 
Oblong Geyser has been monitored electronically intermittently in 1997 and 1998, and then every year since 2001. The sensor for Oblong is located on the edge of the large sinter platform in a location that receives runoff water reliably in warm weather. However, in the wintertime sometimes the sensor becomes encased in ice when there is very low air temperature and long times between eruptions. Therefore, the interval data for December through March sometimes has long intervals that may include eruptions that were undetectable because the sensor was icebound. In many cases it is possible to detect a small temperature rise, but when looking at the analyses in this section keep in mind that there are potentially eruptions in the long intervals that were missed.
In other cases the sensor is moved by the force of the water making subsequent eruption detection difficult.



Activity in 2009 
The overall statistics for 2009 are shown at Oblong 2009 Statistics. A pdf of this summary is at Oblong Recent Activity Summary.
Since early 2007 Oblong has been remarkably consistent in its intervals. Many of the very long and very short intervals occurred near the time of a Giant Geyser eruption.




The interval graph shows all of the intervals for 2009. The graphs for the current year are updated about every six weeks from October to June and weekly from June to the end of September.

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The interval graph for the 3month period preceding the last data download and the graph of intervals for the most recent month show a definite trend to shorter intervals (as shown by the flat red regression fit line).

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The histogram of intervals shows a broad peak between 3h30m and 6n30m hours in the yeartodate (blue) bars. Note that in this and the other histograms displayed here the labels shown on the Xaxis represent the upper boundary of the class, not the midpoint. Geyser times are traditionally truncated. The graph at the right has class widths of 30 minutes. The bar appearing above the label "3:30," for example, contains intervals from 3h01m through 3h30m.

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The final graph for the current year is the monthly statistical summary.

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Activity since 1997 
The graph at the right shows the Oblong data since 1997. Oblong's activity remained substantially the same since the first electronic data available to me, from 1997. Beginning with the summer of 2002 we have substantially continuous coverage, and this shows a tendency to much more long interval activity in the winter months.
As noted before, some of this may be due to ice around the thermistor, but many of these long intervals are not iceaffected and represent the actual behavior of the geyser. Since April of 2006 Oblong's intervals have been shorter and more consistent, largely between three and six hours.

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The next graph shows the moving median interval, where the median was computed on approximately a weekly basis. The actual moving median computation was done each year by finding the average number of eruptions per week and using that number as the range for the median.

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The final graph in this section plots the monthly minimum, mean, median, and maximum interval for those months for which data is available. Minimum intervals are consistently in the 2h to 3h range (except for January 2005, when a few series of eruptions about an hour apart occurred).

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Activity in 2008

Activity in 2007

Activity in 2006

Activity in 2005
