Rupture history of the 1997 Cariaco, Venezuela, earthquake from teleseismic P waves
Geophysical Research Letters
By: C. Mendoza
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Abstract
A two-step finite-fault waveform inversion scheme is applied to the broadband teleseismic P waves recorded for the strike-slip, Cariaco, Venezuela, earthquake of 9 July 1997 to recover the distribution of mainshock slip. The earthquake is first analyzed using a long narrow fault with a maximum rise time of 20 sec. This line-source analysis indicates that slip propagated to the west with a constant rupture velocity and a relatively short rise time. The results are then used to constrain a second inversion of the P waveforms using a 60-km by 20-km two-dimensional fault. The rupture shows a zone of large slip (1.3-m peak) near the hypocenter and a second, broader source extending updip and to the west at depths shallower than 5 km. The second source has a peak slip of 2.1 meters and accounts for most of the moment of 1.1 × 1026 dyne-cm (6.6 Mww) estimated from the P waves. The inferred rupture pattern is consistent with macroseismic effects observed in the epicentral area.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Rupture history of the 1997 Cariaco, Venezuela, earthquake from teleseismic P waves |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/1999GL011278 |
| Volume | 27 |
| Issue | 10 |
| Year Published | 2000 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 1555 |
| Last page | 1558 |
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