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EARTHQUAKE PRECURSOR RESEARCH |
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These pages indicate the detection times of recent earthquakes, as recorded by the Elfrad Group Washington State 02/28/01 18:54:31.0 UTC 47.2N 122.7W Depth= 49 Km M= 7.0
This graph indicates the electrical precursor and seismic activity, before and during the earthquake, that occurred near Seattle, Washington. The graph duration is 21 hours starting at 0:00:38
High electrical activity with a frequency range from .02 to .036 hertz began at 11:00 hrs and continued through the period of this graph. The magnetic field at the time was quiet with very little x-ray activity from Solar sources. The time from the beginning of high ULF radiation until the initial shock of the quake was 473 minutes. The photo below is a graph of data taken yesterday for the same time period and using the same filter.
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