Northeast Pacific Seismicity Quarterly Epicenter Maps

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Abstract: Earthquake location maps for the NE Pacific have been accumulated
since August 29, 1991. The source location fixes are based on bearing
and arrival time information at 3 to 11 SOSUS hydrophone sites. Source
levels are estimated from received amplitudes and a simple
transmission loss model.

Animations of selected seismic swarms from volcanic activity recorded
along the Juan de Fuca and Gorda Ridges are also available. In
addition, a .wav file is available for download to listen to
earthquake activity. These volcanic seismic swarms are characterized
by downrift migrations of epicenters through time. Note that you will
need an MPEG viewer for your Web client.
Related URL
Description: Northeast Pacific Seismicity link to maps and
eruption animation.

Geographic Coverage
Spatial coordinates   
  N: 55.0   S: 40.0   E: -120.0   W: -140.0

Originating Center
Data Center
VENTS, Pacific Marine Environmental Laboratory, OAR, NOAA, U.S. Department of Commerce Supplemental Info
Data Center URL:

Data Center Personnel
Phone: (541) 867-0183
Email: stephen.r.hammond at
Contact Address:
Hatfield Marine Science Center
2115 S.E. OSU Dr.
City: Newport
Province or State: OR
Postal Code: 97365
Country: USA
Phone: (541) 867-0175
Fax: (541) 867-0356
Email: robert.p.dziak at
Contact Address:
NOAA/Pacific Marine Environmental Laboratory
2115 S.E. OSU Drive
City: Newport
Province or State: OR
Postal Code: 97365
Country: USA
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Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2000-01-13
Last DIF Revision Date: 2004-06-10
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