| Abstract: | To investigate near-surface site effects in granite rock, we drilled 300-m deep boreholes at two sites which are collocated with stations from the digital array at Anza, California. Significant motion perpendicular to the polarizations of the first shear-wave arrival was recorded within a few meters of the surface. Apparently, the rock structure is sufficiently complicated that body waves are being converted (SH to SV at oblique incidence) very close to the surface. The presence of these elliptical particle motions within a mere few m of the pure shear-wave source suggests that the detection of polarizations perpendicular to the main shear arrival at a single location at the surface is not, by itself, a good method for detecting shear-wave splitting within the upper few tens of kilometers of the earth‘s crust. -from Authors |
| Genre: | Article |
| ProdID: | 70016096 |
| Citation Author: | Fletcher, J. B.; Fumal, T.; Hsi-Ping, Liu; Carroll, L. C. |
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| Citation End Page: | 831 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bulletin - Seismological Society of America |
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| Citation Number Of Pages: | 25 |
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| Citation Search Results Text: | Near-surface velocities and attenuation at two boreholes near Anza, California, from logging data; 1990; Article; Journal; Bulletin - Seismological Society of America; Fletcher, J. B.; Fumal, T.; Hsi-Ping, Liu; Carroll, L. C. |
| Citation Start Page: | 807 |
| Citation Volume: | 80 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Near-surface velocities and attenuation at two boreholes near Anza, California, from logging data; 1990; Article; Journal; Bulletin - Seismological Society of America; Fletcher, J. B.; Fumal, T.; Hsi-Ping, Liu; Carroll, L. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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