汶川地震之震源破裂过程(英文)

英文篇名：Joint estimation for rupture processes of the 2008 Wenchuan earthquake from regional and near source seismic array observations
中文刊名：国际地震动态
英文刊名：Recent Developments in World Seismology
作者：黄柏寿
英文作者：Bor-Shouh Huang1) ; Jiuhui Chen2) ; Qiyuan Liu2) ; Yue-Gau Chen3) and Xiwei Xu2) Bor-Shouh Huang1) ; Jiuhui Chen2) ; Qiyuan Liu2) ; Yue-Gau Chen3) and Xiwei Xu2) 1) Institute of Earth Sciences ; Academia Sinica ; Taipei 115 2) Institute of Geology ; China Earthquake Administration ; Beijing 100081 3) Depart ment of Geosciences ; Tai wan University ; Taipei 10617
出版日期：2010-06-25
机构：Institute of Earth Sciences, Academia Sinica;
年：2010
期：06
出版单位：国际地震动态

摘要

Source rupture of the 2008 Wenchuan earthquake were estimated based on backward projection of seismic waves to its source plane. Observations from regional seismic arrays and near source stations were employed to study the rupture behavior in its different spatial and temporal stages. Regional broadband arrays from Taiwan and northern Vietnam were used to determine the overall rupture processes of this earthquake. With high density of station distribution of both seismic arrays, the rupture processes of this earthquake were determined. Seismic energy determined from array waveforms have been back-projected to the rupture plane of earthquake to determine its slip distributions in fault plane. The rupture processes have been reconstructed based on time-dependent imaged seismic energy radiated from earthquake fault plane. Analyzed results of this study indicated that the 2008 Wenchuan earthquake has rupture duration more than 80 seconds with major asperities radiated its energy on several seconds after the earthquake rupture initiation. The radiated seismic energy showed complex spatial distribution on the fault plane. The rupture initiated at its epicenter and extended to its northeast direction about 250 km. The averaged rupture velocity of this earthquake is determined to be near 3.3 km/s. According to near source records, the first large amplitude arrivals were delayed by seconds with respect to the origin time and were preceded by a small-scale slip. Based on a beamforming analysis, some near source recordings were used in this study to investigate the initial rupture process of this event. We will discuss the rupture behavior in multiple scales using both near fault and regional arrays for source images in its different stages.

引文