Potential applicability and limitations of radiation-corrected empirical Green's functions for point-source cases
Potential applicability and limitations of radiation-corrected empirical Green's functions for point-source cases
复制标题
辐射校正经验格林函数对于点源情况的潜在适用性和局限性
DOI：
10.1093/gji/ggab503
复制
发表时间：
2021
影响因子：
2.8
通讯作者：
Ide Satoshi
中科院分区：
文献类型：
--
作者：
Shibata Ritsuya;Aso Naofumi;Oikawa Genki;Nakajima Junichi;Ide Satoshi
为了准确估计格林函数，人们已经做出了许多努力，格林函数将观测到的地震波与物理震源过程联系起来。根据给定的速度结构计算出的理论格林函数需要详细的优先级信息。相反，从具有相似震源机制的邻近地震的地震图中获得的经验格林函数(EGF)需要发生这样的适当事件。为了部分地释放这些限制，我们提出了通过校正EGF地震图的辐射模式来校正辐射校正的EGF。在这项研究中，我们进行了综合测试，以量化辐射校正的适用性及其局限性。这类测试是测试EGF适用性基准的有用方法。然后，我们将新方法应用于实际地震，以验证该概念的实际应用。合成试验和实际应用证实了辐射校正EGF在特定但现实的情况下优于传统EGF。
Numerous efforts have been made to accurately estimate Green's functions, which link observed seismic waves to physical source processes. Detaileda prioriinformation is required for the theoretical Green's function calculated from a given velocity structure. In contrast, the empirical Green's function (EGF) obtained from seismograms of nearby earthquakes with similar focal mechanisms requires the occurrence of such appropriate events. To partially release these constraints, we propose radiation-corrected EGF by correcting the radiation patterns of the EGF seismograms. In this study, we performed synthetic tests to quantify the applicability of radiation correction, together with its limitations. Such tests are a useful approach to test a benchmark of EGF applicability. We then applied the new method to real earthquakes to validate the concept for practical use. The synthetic test and real applications confirmed the superiority of the radiation-corrected EGF over the conventional EGF in specific, but realistic, cases.