
Activity Recorded by Data Logger  by Ralph Taylor 



Introduction 
A data logger has been deployed at Fountain Geyser since late August of 2000. We have attempted to obtain a continuous record of Fountain’s activity since that time, but the record has several gaps caused by equipment failure or our inability to recover the data in wintertime. There are gaps from 21 May to 20 June in 2001, 21 February to 23 March 2003, 6 March to 8 April and 23 May to 3 July in 2004, 19 January to 18 March 2005, 2 February to 2 March and 30 March to 21 April 2006, 15 January to 21 March 2007, and 7 January to 28 February 2008. In 2009 there are gaps from 23 February to 1 March due to the logger filling, and from 15 April to 29 May due to the logger filling when access to the area was not allowed because of the bear closure.



Activity in 2011 
The overall statistics for 2011 are shown at Fountain Geyser 2011 Statistics. A pdf of this summary is at Fountain Geyser Recent Activity Summary.




The activity of Fountain Geyser in 2011 is shown in the graph at the right. The blue line shows all of the eruption intervals and the yellow line shows the 1day 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.
Since the end of 2010 Fountain has become more variable in both interval and duration.

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The second graph expands the time line for the past three months.

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The next graph shows Fountain's intervals for the month prior to the most recent download.

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The next graph shows the interval distribution for 2011. 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 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 60 minutes. The bar appearing above the label "5:30," for example, contains intervals from 5h01m through 5h30m.

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The graph at the right shows Fountain's eruption durations for the year to date.

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The next graph shows the duration distribution for 2011. Blue shows the intervals for the whole year to date, maroon shows the previous month, and yellow the previous week.

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The monthly statistics graph shows the maximum, mean, median, and minimum intervals for each month. This chart summarizes the range and gives another perspective on the activity. The minimum value is an indication of how soon after the previous eruption one must arrive at Fountain to be (relatively) sure to see the next eruption and the difference between the minimum and maximum suggests how long the wait could be.

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Activity since August 2000 
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 2000.

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The interval graph shows the large variation in interval from one eruption to the next. Often a better idea of the change in intervals over time can be seen from the graph of the 1day moving median intervals, shown at the right.

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The graph at the right shows Fountain's interval statistics on a month by month basis, including the maximum, minimum, mean, and median intervals for each month.

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Activity in 2010

Activity in 2009

Activity in 2008

Activity in 2007

Activity in 2006
