Relative directivity inversion of small earthquake rupture
Relative directivity inversion of small earthquake rupture
复制标题
小地震破裂相对方向性反演
DOI：
10.1093/gji/ggz179
复制
发表时间：
2019-07
影响因子：
2.8
通讯作者：
Lianxing Wen
中科院分区：
文献类型：
--
作者：
Yanyan Xu;Lianxing Wen
地震破裂的方向性为研究地震的物理机制和强震的产生提供了重要的信息。然而，由于小地震（如ML< 3.3）破裂尺度小，震源到台站的路径效应复杂，确定其破裂方向性是困难的。本文提出了一种确定小震破裂方向的新方法--相对方向性反演法。RDI方法基于目标地震单侧破裂的假设，利用一个地震对，以较小的同相轴为参考，通过确定较大同相轴相对于参考同相轴的起始点和质心能量点的位置，反演较大同相轴的方向性。将目标地震的破裂方向确定为从震源位置到能量质心位置的方向，破裂长度为两个位置之间距离的两倍。作为检验该方法的一个实例，我们应用RDI方法确定了日本ML3.2目标地震的破裂方向性，得到了观测波形特征、综合检验和该地区地震分布的支持。
The rupture directivity of an earthquake provides important insights into its physical mechanisms and strong motion generation. However, it is difficult to determine the rupture directivity of small earthquakes (e.g.ML< 3.3) because of their small rupture dimension and complex path effects from source to stations. Here we develop a new method, named ‘relative directivity inversion method’ (or RDI method), to determine rupture direction of small earthquakes. Based on the assumption that the target earthquake ruptures unilaterally, RDI method uses an earthquake pair and uses the smaller event as reference to invert the directivity of the larger event by determining the locations of its initiation point and the centroid energy point relative to those of the reference event. The rupture direction of the target earthquake is determined as the direction from the initiation location to the centroid energy location, and the rupture length as twice the distance between the two locations. As an example of testing the method, we apply RDI method to determine the rupture directivity of a target earthquake in Japan (ML3.2) and obtain results that are supported by the observed waveform features, synthetic test and the distribution of earthquakes in the region.
登录
查看更多内容
影响因子：
2
作者：
I. Kurzon;F. Vernon;Y. Ben‐Zion;G. Atkinson
通讯作者：
I. Kurzon;F. Vernon;Y. Ben‐Zion;G. Atkinson
影响因子：
3
作者：
Wen Yu
通讯作者：
Wen Yu
影响因子：
2.8
作者：
KENNETT, BLN;ENGDAHL, ER
通讯作者：
ENGDAHL, ER
影响因子：
5.2
作者：
Meng, Lingsen;Inbal, Asaf;Ampuero, Jean-Paul
通讯作者：
Ampuero, Jean-Paul
影响因子：
3
作者：
Ying Tan;D. Helmberger
通讯作者：
Ying Tan;D. Helmberger