Rupture directivity effect on strong ground motion during the 12 May 2008 MW7.9 Wenchuan earthquake |
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| Authors: | Zhao An Jun-Ju Xie Yong Zhang Xiao-Jun Li Zeng-Ping Wen |
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| Affiliation: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2.School of Earth and Space Sciences, Peking University, Beijing 100871, China3.China Earthquake Hazard and Insurance Research Laboratory, Beijing 100081, China4.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | We focus here on the rupture directivity effect on the spatial distribution and attenuation characteristics of near-field ground motions during the 2008 MW7.9 Wenchuan earthquake. We examine the difference between the observed ground motions in and opposite the rupture directions and compare them with Next Generation Attenuation-West2 (NGA-West2) ground motion prediction models. The isochrone directivity predictor is used to quantify the band-limited nature of the rupture directivity effect on strong ground motion. Our results show that the observed peak ground velocity (PGV) and spectral accelerations of periods of 1.0 s and longer are significantly amplified in the rupture direction, but de-amplified in the opposite direction affected by rupture directivity effect of this event. In contrast, the effect of rupture directivity on the observed peak ground acceleration (PGA) and periods of shorter than 1.0 s are relatively weak. The rupture directivity of this event shows clear period dependent and band limited characteristics with the strongest effect occurring around the period of 7.5 s. |
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| Keywords: | Wenchuan earthquake long-period ground motion near-fault ground motion rupture directivity |
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