
Activity Recorded by Data Logger  by Ralph Taylor 



Introduction 
A data logger has been deployed at Spouter Geyser since July of 2000, and some data files from previous years also exist. We have attempted to obtain a continuous record of Spouter’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 9 August to 4 October in 2001, 30 January to 28 May 2002, 8 April to 14 July 2004 and three very short gaps in January, July, and December 2005.



Activity in 2010 
The overall statistics for Spouter Geyser in 2010 to date are shown at Spouter Geyser 2010 Statistics.




Spouter Geyser's intervals in 2010 are shown in the graph at the right. The blue line shows all of the eruption intervals and the green 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.

Click for a larger image



The next graph shows the interval distribution for 2009. 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.

Click for a larger image



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

Click for a larger image



The next graph shows the duration distribution for 2009. Blue shows the intervals for the whole year to date, maroon shows the previous month, and yellow the previous week.

Click for a larger image



Spouter Geyser demonstrates a striking correlation between the duration of one eruption and the interval from the start of that eruption to the start of the next eruption.
The graph at the right illustrates the correlation for all of the eruptions recorded in 2010 to date.

Click for a larger image


Activity since July 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.

Click for a larger image



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.

Click for a larger image


Activity in 2009

Activity in 2008
