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| Activity Recorded by Data Logger - by Ralph Taylor |
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| Introduction |
When some additional data loggers became available in the late summer of 2002 we deployed one on Rift Geyser and one on West Triplet Geyser.
West Triplet Geyser is located to the southwest of Grand Geyser a few meters from the boardwalk and is known to be one of the interconnected geysers of the Grand Geyser complex. Other members of the complex are Grand Geyser, Turban Geyser, Rift Geyser, Percolator Geyser, and Vent Geyser.
The sensor for West Triplet is located a few meters downstream of the geyser formation in the runoff channel. Start times for West Triplet on the data logger lag visual times by a few minutes since no overflow occurs until the geyser has been in eruption for a few minutes.
I have written software to determine the end times for West Triplet's eruptions, but because of the gradual trailing off of the eruptions, the end times (and therefore durations) are not as accurate as the start times. At this time I do not have a quantification of the error in durations derived from logger data.
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| Activity in 2010 |
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The full statistics for 2010 are shown at West Triplet Geyser 2010 Statistics.
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The first graph shows the eruption intervals for 2010 plotted against the eruption start time and date. Many of the eruptions occur in pairs separated by an hour or so.
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The next graph shows the intervals over the past three months.
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The distribution of the intervals for 2010 to date along with the most recent month and week are shown in the histogram at the right. The intervals around 3h00m are the double eruptions, the ones between 5 and 10 hours are the longer intervals between pairs of eruptions.
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 30 minutes. The bar appearing above the label "5:00," for example, contains intervals from 4h31m through 5h00m.
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The next graph shows West Triplet's durations plotted against time and date of the eruption start.
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The next graph shows the West Triplet Geyser eruption durations for the past three months.
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The duration distribution histogram is another look at the pattern of durations. The labels shown on the X-axis represent the upper boundary of the class, not the midpoint. The durations represented by the bars over the label 1:20, for example, represents the percentage of durations between 1h15m and 1h20m.
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| Activity since 2002 |
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The graph at the right shows all of the electronically recorded intervals for West Triplet Geyser. The long gap in the spring of 2005 resulted from a logger failure. Note the gradual decline in the intervals, especially the longest intervals, between 2002-3 and 2005-6.
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The next graph shows the moving 1-week median intervals. this graph suppresses the extreme values and gives a somewhat clearer picture of the changes.
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The next graph shows the monthly minimum, mean, median, and maximum intervals.
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The final graph shows the monthly minimum, mean, median, and maximum durations. As with the interval statistics, there has been little change since 2002.
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Activity in 2009
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Activity in 2008
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Activity in 2007
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