1. Radiated seismic energy of earthquakes in the south–central region of the Gulf of California, Mexico.
- Author
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Castro, Raúl R, Mendoza-Camberos, Antonio, and Pérez-Vertti, Arturo
- Subjects
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EARTHQUAKES , *ATTENUATION (Physics) , *SEISMIC anisotropy , *VELOCITY , *PSYCHOLOGICAL stress testing - Abstract
We estimated the radiated seismic energy (E S) of 65 earthquakes located in the south–central region of the Gulf of California. Most of these events occurred along active transform faults that define the Pacific–North America plate boundary and have magnitudes between M 3.3 and M 5.9. We corrected the spectral records for attenuation using non-parametric S -wave attenuation functions determined with the whole data set. The path effects were isolated from the seismic source using a spectral inversion. We computed radiated seismic energy of the earthquakes by integrating the square velocity source spectrum and estimated their apparent stresses. We found that most events have apparent stress between 3 × 10−4 and 3 MPa. Model independent estimates of the ratio between seismic energy and moment (E S/ M 0) indicate that this ratio is independent of earthquake size. We conclude that in general the apparent stress is low (σa < 3 MPa) in the south–central and southern Gulf of California. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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