Strong SH-to-Love wave scattering off the Southern California Continental Borderland
Geophysical Research Letters
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Abstract
Seismic scattering is commonly observed and results from wave propagation in heterogeneous medium. Yet, deterministic characterization of scatterers associated with lateral heterogeneities remains challenging. In this study, we analyze broadband waveforms recorded by the Southern California Seismic Network and observe strongly scattered Love waves following the arrival of teleseismic SH wave. These scattered Love waves travel approximately in the same (azimuthal) direction as the incident SH wave at a dominant period of ~10 s but at an apparent velocity of ~3.6 km/s as compared to the ~11 km/s for the SH wave. Back-projection suggests that this strong scattering is associated with pronounced bathymetric relief in the Southern California Continental Borderland, in particular the Patton Escarpment. Finite-difference simulations using a simplified 2-D bathymetric and crustal model are able to predict the arrival times and amplitudes of major scatterers. The modeling suggests a relatively low shear wave velocity in the Continental Borderland.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Strong SH-to-Love wave scattering off the Southern California Continental Borderland |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2017GL075213 |
| Volume | 44 |
| Issue | 20 |
| Year Published | 2017 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Earthquake Science Center |
| Description | 8 p. |
| First page | 10208 |
| Last page | 10215 |
| Country | Mexico, United States |
| State | California |
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