[Geysers] No Norris disturbance?

[Pat Snyder]

Thank you very much, Scott! What needs to happen to indeed verify  
that this is one of those rare years?
Pat S.


On Nov 30, 2005, at 8:23 PM, TSBryan at aol.com wrote:

> In a message dated 11/30/2005 5:15:13 PM Pacific Standard Time,  
> riozafiro at comcast.net writes:
> Scott, or anyone...just how rare is a "no significant disturbance  
> year"?
> Thanks,
> Pat S.
> This isn't all that easy to answer, but the following is known:
>
> 1. The first record of a (probable) disturbance was in 1878.
> 2. Disturbances have been recorded in not fewer than 77 years since  
> 1878 (so in 78 years, total). Apparently, though, it was not until  
> the disturbance of 1926 that details were recorded (by Phillips).  
> Records that cite any Norris activity were extremely sparse during  
> the first 50+ years of Yellowstone history.
> 3. USGS/NPS (most specifically in USGS Professional Paper 1456)  
> notes the disturbances as "almost with annual frequency."
> 4. There have been some years in which disturbances repeated  
> several times in a single season.
> 5. Some disturbances have affected ALL of Norris (Porcelain, Back,  
> 100 Springs, and even Elk Park) -- including that of 1974 which  
> PP1456 (read, Hutchinson [sorry, but true] ) stated "details not  
> recorded." See Transactions VII.
>
> Well, anyway -- it seems that a year without a disturbance is  
> indeed unusual.
>
> I should note, too, I suppose, that the official term for this (I  
> guess it's official, since it is used in PP1456) is "Widespread  
> Contemporaneous Changes." Yuk.
>
> Scott Bryan
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