If this quake is the one which was in the shadow zone,
I think you cant trust the normal phases to give you
the right distances ??


On 1/11/2012 3:54 PM, Thomas Dick wrote:
> I didn't post this quake. It confused me. Did anyone notice an unusual
> number of spikes/peaks on their horizontal units (particularly E-W from
> Indiana) between the arrival of S and the arrival of LQ? They are on the
> USIN units as well as mine? (namely at 2 min after S, and between 19 and
> 39 minutes-- ending about 8 minutes before LQ predicted arrival) --- 
> PKP. PP, PPS and even SSS come through well on the vertical ...
> frequency of these mystery waves seems to be between .02 and .1 Hz --
> another quake????
> 
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