[irised] wells nevada record, station SHMT

[John Taber]

Craig,

Picking the phases for a closer event can be difficult if you only  
have a single station, so I've attached a plot made by Chuck Ammon  
that shows hundreds of stations from USArray.   At your distance I  
think your first arrival is a refraction from the Moho (the base of  
the crust) and the second arrival is the direct wave traveling  
through the crust.   The S wave would then be around 14:21:10.

John Taber

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On Feb 26, 2008, at 4:28 PM, Craig Messerman wrote:

> Hi All,
> I'm attaching our record of the Wells quake. My students are  
> analyzing it this week, but the arrival interpretation is  
> difficult. The first motion seems to be the low amplitude waves  
> that arrive at 14:19:18, but then a very distinct and stronger   
> phase arrives just 21 seconds later, too soon to be an S.  Could be  
> PP? If that's the case then the S arrival seems buried between that  
> phase and the surface arrivals. We haven't had the chance until now  
> to work with such a close and recent event, so if anyone could take  
> a look and advise, we'd appreciate it.
>
> Craig Messerman
> Sentinel High School, Missoula, Montana
>
>
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