Doppler effect of the rupture process of the great MW7.9 Wenchuan earthquake
Ge Jin1, 2, Youcai Tang1, Shiyong Zhou1, Yongshun John Chen1
1 Institute of Theoretical and Applied Geophysics (ITAG), School of Earth and Space Sciences, Peking University, Beijing 100871, China 2 Lamont-Doherty Earth Observatory, Columbia University in the New York City, Palisades, NY, 10964, USA
Doppler effect of the rupture process of the great MW7.9 Wenchuan earthquake
Ge Jin1, 2, Youcai Tang1, Shiyong Zhou1, Yongshun John Chen1
1 Institute of Theoretical and Applied Geophysics (ITAG), School of Earth and Space Sciences, Peking University, Beijing 100871, China 2 Lamont-Doherty Earth Observatory, Columbia University in the New York City, Palisades, NY, 10964, USA
摘要In this study we performed a classical spectrum analysis of seismic waveforms recorded at far field stations of the great MW7.9 Wenchuan earthquake to observe the shifts of the corner frequency with azimuth due to the Doppler effect. Our results show that this damaging great earthquake had a dominating rupture propagation direction of 64.0°. The equivalent radius of the fault rupture surface was estimated to be 33 km, yielding the rupture area of about 3 500 km2. Thus the length of the rupture fault surface is about 230 km if the depth (or width) extent is 15 km. The computer program developed in this study can quickly provide the information about the source of a future large (damaging) earthquake, which could be very useful for predicting aftershocks and planning the rescue operations.
Abstract:In this study we performed a classical spectrum analysis of seismic waveforms recorded at far field stations of the great MW7.9 Wenchuan earthquake to observe the shifts of the corner frequency with azimuth due to the Doppler effect. Our results show that this damaging great earthquake had a dominating rupture propagation direction of 64.0°. The equivalent radius of the fault rupture surface was estimated to be 33 km, yielding the rupture area of about 3 500 km2. Thus the length of the rupture fault surface is about 230 km if the depth (or width) extent is 15 km. The computer program developed in this study can quickly provide the information about the source of a future large (damaging) earthquake, which could be very useful for predicting aftershocks and planning the rescue operations.
Ge Jin, Youcai Tang, Shiyong Zhou, Yongshun John Chen. Doppler effect of the rupture process of the great MW7.9 Wenchuan earthquake[J]. 《地震学报》英文版, 2010, 23(6): 535-539.
Ge Jin, Youcai Tang, Shiyong Zhou, Yongshun John Chen. Doppler effect of the rupture process of the great MW7.9 Wenchuan earthquake. Earthquake Science, 2010, 23(6): 535-539.