Seismic studies at the Mt. Hood Volcano, northern Cascade Range, Oregon
Open-File Report
79-1691
By: Susan Molly Green, Craig S. Weaver, and Hariharaiyer Mahadeva Iyer
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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.
Suggested Citation
Green, S.M., Weaver, C.S., Iyer, H.M., 1979, Seismic studies at the Mt. Hood Volcano, northern Cascade Range, Oregon: U.S. Geological Survey Open-File Report 79-1691, 27 leaves, [13] leaves of plates :ill., maps ;27 cm.; (40 p. - PGS), https://doi.org/10.3133/ofr791691.
ISSN: 2331-1258 (online)
| 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 |
| DOI | 10.3133/ofr791691 |
| Year Published | 1979 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | 27 leaves, [13] leaves of plates :ill., maps ;27 cm.; (40 p. - PGS) |