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2007年9月12～13日在苏门答腊西海域发生了3次震级分别为MW8.4,MW7.9和MW7.0的强烈地震.用全球范围内震中距在30°～90°的宽频带数字地震台的资料,借助于逆时成像技术,重新确定了这三次地震的震中位置和震源深度.利用北京首都圈数字地震台网33个宽频带数字地震台构成的“广义”台阵,借助于非平面波台阵技术,构建了这三次地震能量辐射源的时空变化图像,获得了它们的破裂持续时间、破裂尺度以及破裂速度,讨论了3次地震能量辐射源的相互关系。
Three strong earthquakes with magnitudes MW8.4, MW7.9 and MW7.0 occurred in the western Sumatra region from September 12 to September 2007 respectively.With the wide range of epicenters ranging from 30 ° to 90 ° Based on the data of seismic stations, the epicenter locations and focal depths of these three earthquakes were re-determined by means of reverse-time imaging technology.Based on the “generalized” array consisting of 33 broadband digital seismic stations in the Beijing metropolitan area digital seismic network, With the help of non-plane wave array technology, the temporal and spatial variations of these three seismic energy radiation sources were constructed, their duration of rupture, rupture scale and rupture speed were obtained. The relationships among the three seismic energy sources were discussed.