Rise time and source duration of the 2008 MW 7.9 Wenchuan (China) earthquake as revealed by Rayleigh waves

Details Rise time and source duration of the 2008 MW 7.9 Wenchuan (China) earthquake as revealed by Rayleigh waves Rise time and source duration of the 2008 MW 7.9 Wenchuan (China) earthquake as revealed by Rayleigh waves

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ep%26s...63..427h&link_type=abstract

Earth, Planets and Space, Volume 63, Issue 5, p. 427-434.

Physics

Scientific paper

The fault parameters of the 2008 Wenchuan earthquake were studied in a rupture directivity analysis by simultaneously inverting the period of the first Fourier spectral-node and the 100-s phase-delay time of the Rayleigh wave. The results show that the earthquake is a unilateral event with an optimal rupture azimuth of N59°E, consistent with the distribution of aftershocks. They also indicate that the fault plane strike is in the NE-SW direction, corresponding to the fault plane strike of 238° and NW-dipping (reported by the USGS). The inversion shows the source duration (including the rise time and rupture time) and rise time are 70±0.8 s and 9.3±0.6 s, respectively. The rupture velocity estimated only from the rupture time exhibits relatively higher value, 3.45±0.10 km/s, close to or larger than the S-wave velocity in the crust. One possible cause is that the rupture mechanism transferred from the thrust faulting in the southwestern portion of the fault to the strike-slip faulting in the northeastern one. The rise time offers an estimate of the dynamic stress drop (37.8±2.3 bars), from which through a macroscopic view the radiated seismic energy of (5.93±0.4) × 1016 N m is calculated. Although the estimated rupture length (˜210 km) and source duration are shorter than several source rupture models, the current analyses show the first-order rupture feature of the 2008 Wenchuan earthquake rupturing the Longmenshan fault zone.

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