Estimating high frequency energy radiation of large earthquakes by image deconvolution back-projection
Estimating high frequency energy radiation of large earthquakes by image deconvolution back-projection
复制标题
利用图像反卷积反投影估算大地震高频能量辐射
DOI：
10.1016/j.epsl.2016.05.051
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发表时间：
2016-09
影响因子：
5.3
通讯作者：
Mori Jim
中科院分区：
文献类型：
--
作者：
Wang Dun;Takeuchi Nozomu;Kawakatsu Hitoshi;Mori Jim
大地震的高频能量辐射是评价震动损伤的关键，也是了解破裂动力学的重要震源特征。我们开发了一种新的反演方法，图像解卷积反投影（IDBP），通过反投影方法观测图像的线性反演来检索震源的高频能量辐射。观察到的多个源的反投影图像被认为是真实辐射能量的图像和点源的阵列响应的卷积。在空间和时间上传播能量的阵列响应是通过使用较小的参考地震（可以假设为点源）的数据来评估的。综合测试表明，该方法的光源时空分辨率明显优于传统反投影方法。我们利用日本 Hi-net 记录的数据，将这种新方法应用于 2001 年昆仑 7.8 级地震。新方法解析了高频能量辐射的清晰图像，其中有很大一部分是超剪切破裂。
High frequency energy radiation of large earthquakes is a key to evaluating shaking damage and is an important source characteristic for understanding rupture dynamics. We developed a new inversion method, Image Deconvolution Back-Projection (IDBP) to retrieve high frequency energy radiation of seismic sources by linear inversion of observed images from a back-projection approach. The observed back-projection image for multiple sources is considered as a convolution of the image of the true radiated energy and the array response for a point source. The array response that spreads energy both in space and time is evaluated by using data of a smaller reference earthquake that can be assumed to be a point source. The synthetic test of the method shows that the spatial and temporal resolution of the source is much better than that for the conventional back-projection method. We applied this new method to the 2001 M w 7.8 Kunlun earthquake using data recorded by Hi-net in Japan. The new method resolves a sharp image of the high frequency energy radiation with a significant portion of supershear rupture.
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影响因子：
3
作者：
M. Kikuchi;H. Kanamori
通讯作者：
M. Kikuchi;H. Kanamori
影响因子：
3.9
作者：
Koper, Keith D.;Hutko, Alexander R.;Sufri, Oner
通讯作者：
Sufri, Oner
影响因子：
5.2
作者：
M. Haney
通讯作者：
M. Haney
影响因子：
3.7
作者：
Yan Xu;K. Koper;Oner Sufri;Lupei Zhu;A. Hutko
通讯作者：
Yan Xu;K. Koper;Oner Sufri;Lupei Zhu;A. Hutko
影响因子：
2.8
作者：
H. Nakahara;M. Haney
通讯作者：
H. Nakahara;M. Haney