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Seismic studies at the Mt. Hood Volcano, northern Cascade Range, Oregon

Open-File Report 79-1691

By:
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Abstract

A sixteen station telemetered seismic network was established in the Mt. Hood, Oregon area to monitor local seismicity and to study crustal and upper mantle structure. The network was in operation 13 months, and recorded 10 local earthquakes, 25 regional events, and 300 teleseisms. A series of construction blasts were recorded and used to define an average upper crustal velocity of 5.4 km/s in the region. All local earthquakes occurred beneath Mt. Hood at shallow depths and roughly define a zone striking north-northwest beneath the mountain. The largest earthquake was a magnitude 3.4 event which had a strike-slip focal mechanism. The other events had magnitudes (ML) less than 2.0. P-wave travel time residuals from teleseismic events show a 0.5 second decrease in travel time from east to west across the Cascade Range. No travel time anomalies are associated directly with Mt. Hood.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Seismic studies at the Mt. Hood Volcano, northern Cascade Range, Oregon
Series title:
Open-File Report
Series number:
79-1691
Edition:
-
Year Published:
1979
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
27 leaves, [13] leaves of plates :ill., maps ;27 cm.; (40 p. - PGS)