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(click to enlarge)
Plot of Earthquake Epicenters; Bathymetry is based
on satellite altimetry from Smith and Sandwell. Estimated error for the
site based on a numerical
simulation is 7-minutes in latitude and 5 minutes in longitude.
Mean position is 22 10.55'S, 113 10.86' W. |
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Beginning
September 5, 1996, the Autonomous
Hydrophone Array deployed by PMEL in the Eastern Equatorial Pacific
recorded an episode of seismicity from the East Pacific Rise near 22 S
and 113W. The activity continued for 3 days with a total of 165 events
located.
The
location is at the northern edge of the Easter Microplate. The seismicity
was originally interpreted to be of volcanic origin, but the presence
of a large (Ms = 7.1) thrust mainshock recorded by the global networks
indicates the activity to be an aftershock sequence.
A discussion
has been published by Delouis, Nicolas, Ildefonse, and Philip,
1998, GRL, vol 25, no.9 1443-1446.
Histogram
of number of earthquakes recorded from the volcanic site per one-hour
period.
(click to enlarge)
Listing
of earthquake epicenters from the EPR at 22 S recorded September, 1996.
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