[Geysers] Giant and other May 19

[Lynn Stephens]

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Tara,
    Thanks for providing the information.  For what it's worth--your "noticeable" difference is statistically significant  at the .004 level of significance (in other words, there is less than a 1% chance that it would be a mistake to conclude that durations following a Mastiff function eruption are shorter than durations following a non-Mastiff function.)
     I'll try to remember to check my logbook to see if I have the duration of the August 5 eruption.
Lynn



________________________________
> From: fanandmortar at hotmail.com
> To: geysers at wwc.edu
> Date: Sun, 20 May 2007 01:57:32 -0600
> Subject: Re: [Geysers] Giant and other May 19
> 
> >GIANT May 19, 2007 @1209, interval exactly 5d 00h 00m, duration somewhat short @86 minutes.
> >Open question: is this sort of duration typical of a Mastiff function eruption?
> Interesting question.  This answer comes with the understanding that different observers may call the end of the eruption differently, but based on my experience, these numbers are pretty consistent; 8 of these durations are my own.
> Based on the data I have for 2006, eruptions of Giant that were not preceded by Mastiff tended to have longer durations than those that were.  I have duration data for 18 of the 26 eruptions witnessed between April 23 and November 26.  Here's the break-down (all durations in minutes):
> With Mastiff (11):  70, 85, 85, 86, 90, 94, 95, 96, 96, 97, 97, average 90.1
> Without Mastiff (7):  91, 95, 100, 101, 101, 102, 104, average 99.1
> This represents a noticeable difference of 9 minutes on average.
> There was a bit of a tendency (based on an admittedly small amount of data) for the shortest durations to follow the shortest intervals.  The shortest 3 durations for eruptions with Mastiff and the shortest 2 for eruptions without all occurred after intervals of 6 days or less.
> If anyone would like more specific information, or would like to report the durations for some of the eruptions I'm missing (5/31, 8/5, 9/22, 10/22, 10/27), please contact me.
> Thanks again to Scott for the reports!
> - Tara Cross
> fanandmortar at hotmail.com
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