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| Activity Recorded by Data Logger - by Ralph Taylor |
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| Introduction |
A data logger has been deployed at Lone Pine Geyser since July of 1997. From then to the winter of 2002-3 the electronic record only contains June-September data. The record since the summer of 2002 is complete except for a gap from early 2004 to 21 July 2004 caused by a logger failure. During the summer months data is recorded every minute; during the winter months data is recorded every three minutes.
During winter (about December to March) ice formation sometimes makes eruptions difficult or impossible to detect. Some eruptions leave only a one or two degree Celsius rise in temperature in the record; others are undoubtedly missed completely.
The sensor for Lone Pine is located in a runoff channels about five meters from the edge of the pool and about ten meters from the pool along the stream. The sensor easily detects the temperature rise from the initial overflow wave at the eruption start but does not record the actual eruption duration as the water is sprayed far into the air and does not follow the runoff channel.
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| Activity in 2010 |
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The overall statistics for 2010 are shown at Lone Pine Geyser 2010 Statistics. A pdf of this summary is at Lone Pine Geyser Recent Activity Summary.
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The activity of Lone Pine Geyser in 2010 to date is shown in the graph at the right. The blue line shows all of the eruption intervals and the yellow line shows the 1-week moving median interval. 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 second graph expands the time line for the past three months. Lone Pine's intervals dropped into the 24-hour range in early May and have remained there through mid-August.
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The next graph shows Lone Pine's intervals for the month before the last download.
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The next graph shows the interval distribution for 2010. The width of the peak shows the uncertainty in intervals. Blue shows the intervals for the whole year to date, maroon shows the previous month, and yellow the previous week. Note that in this and the other histograms displayed here the labels shown on the X-axis represent the upper boundary of the class, not the midpoint. Geyser times are traditionally truncated. The graph at the right has class widths of 60 minutes. The bar appearing above the label "22:00," for example, contains intervals from 21h01m through 22h00m.
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The year to date interval statistics for 2010 are summarized in the graph at the right.
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Since June of 2010 Lone Pine has had a strong preference for nighttime eruptions. The graph at the right shows the percentage of all eruptions that occurred in each hour. As of 10 August 83% of the eruptions occurred between 2000 and 0800.
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| Activity since 1997 |
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One way to present the eruption interval data is to graph the interval as a function of time. The graph shown at the right shows all of the electronically recorded intervals since 1997.
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The interval graph shows the large variation in interval from one eruption to the next. A better idea of the change in intervals over time can be seen from the graph of the 1-week moving median intervals, shown at the right. From both graphs the sharp drop in intervals from late winter of 2002 to about June of 2002 shows clearly. The large increase in intervals starting in November 2002 is believed to be caused by the Denali earthquake. At the time the Lone Pine intervals increased and became more erratic, nearby Occasional Geyser reactivated, and possibly has contributed to the increased Lone Pine intervals.
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Activity in 2009
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Activity in 2008
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