thumbnail

Rupture history of the 1997 Cariaco, Venezuela, earthquake from teleseismic P waves

Geophysical Research Letters

By:
DOI: 10.1029/1999GL011278

Links

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.

Additional Publication Details

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
Number of Pages:
4