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Re: The Hector Mine Earthquake, 10/16/1999

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Greg -

The 1964 Alaskan earthquake caused a seiche in Lake Pontchartrain.  Same 
basic phenomenon where very low frequency seismic energy is captured by a 
"liquid storage tank" (in that case, the lake).  I forget the magnitude of 
the seiche, though.  One thing to check out is what frequency range your 
instrumentation records.  I suspect the seiche should come from very low 
frequency levels & some accelerometers do not record below about 0.5 Hz.  
Not sure about the time frame, though.  2 hours could be about right since 
the propagation rate is relatively slow (I think) for most long period waves.
(in comparison with the high freq stuff).  


Charles Hamilton, EIT                   Graduate Student Researcher     
Department of Civil and                 Phone: 949.824.8694
    Environmental Engineering           FAX:   949.824.2117 
University of California, Irvine        Email: chamilto(--nospam--at)