| 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 9237 |
| Citation Author: | Green, Susan Molly; Weaver, Craig S.; Iyer, Hariharaiyer Mahadeva |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 27 leaves, [13] leaves of plates :ill., maps ;27 cm.; (40 p. - PGS) |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 79-1691 |
| Citation Search Results Text: | Seismic studies at the Mt. Hood Volcano, northern Cascade Range, Oregon; 1979; OFR; 79-1691; Green, Susan Molly; Weaver, Craig S.; Iyer, Hariharaiyer Mahadeva |
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| Citation Year: | 1979 |
| Type: | citation/reference |
| Text: | Seismic studies at the Mt. Hood Volcano, northern Cascade Range, Oregon; 1979; OFR; 79-1691; Green, Susan Molly; Weaver, Craig S.; Iyer, Hariharaiyer Mahadeva |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1979/1691/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1979/1691/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
