[Geysers] Giant Sunday, July 23 (A true Mastiff Function?)

[Karen Webb]

Please, did anyone take pictures??
Karen

Lynn Stephens wrote:

>David Monteith wrote the following about the July 23 eruption of Giant:
>
>  
>
>>Giant erupted today, Sunday July 23, at 1320.  The eruption came
>>approximately 10 hours after an approximately 34 hour Grotto Marathon.  At
>>the time of the expected Grotto re-start.
>>    
>>
>
>I think maybe what David meant to write was "At the time of the expected 
>recovery hot period."
>Following an approximately 34 hour marathon, I would not expect the Grotto 
>restart for a LONG time.  Intervals following marathons are ROUGHLY twice 
>the duration--i.e., after 24-26 hour marathons, the interval is about 45 - 
>50 hours and after 30 - 33 hour marathons, have been about 58 - 60 hours.  
>The marathon probably stopped somewhere between 3 and 4 am, so I would not 
>have expected the next Grotto start until sometime on July 24.
>
>I told several people that following an approximately 34 hour Grotto 
>Marathon, the recovery hot period should probably wait until 10-12 hours 
>after the end of the marathon, which put my window at 1pm - 3pm.  I believe 
>a couple other people had put the window at noon - 2 pm for the window for 
>the recovery hot period.
>
>
>  
>
>>The hot period was unusual.  Mastiff started erupting about 3 1/2 minutes
>>into the hot period with both the front and back vents taking part.  The
>>eruption reached 30 feet and lasted about 2 minutes.  At which point
>>everything stopped.  Mastiff dropped a few inches below overflow and
>>feather stopped (I can't remember what Tara said about Bijou but I think
>>she said it was off.)
>>    
>>
>
>Bijou did turn back on for a brief time following the first eruption of 
>Mastiff, then turned off again as the hot period restarted.
>
>
>  
>
>>For
>>a while now, the behavior of the geysers along the line from Grotto to
>>Oblong have been an excellent indicator of impending Giant eruptions.
>>    
>>
>
>The Oblong interval preceding this eruption was 5h34 minutes rather than the 
>sub-4 hour interval it's had prior to several of the recent eruptions of 
>Giant.
>
>  
>
>>Furthermore, this is the first Mastiff function I know of in
>>the last 12 years that mimics the behavior reported by Marler in the final
>>years of the 1950's activity.  In particular, the simultaneous eruptions of
>>Catfish, Mastiff and Giant resulting in exemplary eruptions of all three.
>>    
>>
>
>I don't have my logbooks here with me, but I do have a photograph of Catfish 
>(with the dual spires) from an eruption in either July or August 1997 when 
>Mastiff and Catfish and Giant were erupting simultaneously in exemplary 
>eruptions of all three.  (Even with my wide angle lens I couldn't get 
>Catfish, Mastiff, and Giant in the same photo plus there was plenty of steam 
>that morning.)  This eruption of Mastiff was taller than the 1997 eruption, 
>but Mastiff was still hitting 50 feet and Catfish was between 30-35 feet and 
>Giant was HUGE.  I'll have to check my logbooks, but I also believe I saw an 
>April eruption in the 2000's with an "exemplary" eruption of Catfish and a 
>50+ foot eruption of Mastiff.
>
>Lynn Stephens
>
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