Backprojection analyses from four regional arrays for rupture over a curved dipping fault: The Mw 7.7 24 September 2013 Pakistan earthquake
Backprojection analyses from four regional arrays for rupture over a curved dipping fault: The Mw 7.7 24 September 2013 Pakistan earthquake
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DOI：
10.1002/2015jb012168
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
Dun Wang;H. Kawakatsu;J. Mori;B. Ali;Z. Ren;X. Shen
中科院分区：
文献类型：
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作者：
Dun Wang;H. Kawakatsu;J. Mori;B. Ali;Z. Ren;X. Shen
我们使用欧洲、中国和日本四个不同区域阵列（Hi-net 和 F-net）记录的数据，通过反投影分析对 2013 年 9 月 24 日巴基斯坦地震（震级 7.7）进行了分析。所有阵列的结果显示破裂向西南方向传播，持续时间约为 40-50 秒。其中，Hi-net 和 China 阵列子集的结果显示出明显的快速破裂传播部分，破裂速度可能比局部剪切波速度更快。使用自举测试、余震反投影以及合成源模型的数值测试来研究各种阵列结果的分辨率。这些测试的结果显示了四个阵列的结果质量存在差异。中国的阵列和日本的 Hi-net 在这种情况下显示出最好的结果。日本的 F-net 由于站数较少，结果最差。大振幅（相当于 M 6.8 事件）的位置具有约 20 至 30 km 的绝对不确定性（忽略源维度）。
We analyzed the 24 September 2013 Pakistan earthquake (Mw 7.7) with backprojection analyses using data recorded on four different regional arrays in Europe, China, and Japan (Hi‐net and F‐net). The results from all the arrays show propagation of the rupture toward the southwest for duration of about 40–50 s. Among them, results for Hi‐net and a subset of China array show a clear segment of fast rupture propagation, with a rupture speed probably faster than the local shear wave velocity. Resolutions of the results from the various arrays are investigated using bootstrap tests, backprojection of aftershocks, and numerical tests with synthetic source models. The results of those tests show differences in the quality of the results from the four arrays. The China array and the Hi‐net in Japan show the best results for this case. F‐net in Japan shows the poorest results because of the few number of stations. The locations of large amplitudes (equivalent to a M 6.8 event) have absolute uncertainties of about 20 to 30 km (ignoring the source dimension).