CODA WAVES - A REVIEW
CODA WAVES - A REVIEW
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DOI：
10.1007/bf00879572
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发表时间：
1987-01-01
影响因子：
2
通讯作者：
ESPINOSA, AF
中科院分区：
文献类型：
--
作者：
HERRAIZ, M;ESPINOSA, AF
自七十年代初以来，尾波的分析和解释越来越受到人们的重视。近几年来，这一课题在世界范围内引起了广泛的兴趣，高频地震尾波的研究已成为一个十分重要的地震学课题。本次研究得出的结论是，尾波被认为是地震波不均匀性引起的散射过程的结果，PandS波在这种相互作用中发挥着特别重要的作用。该过程引入衰减，该衰减与固有吸收相加，给出观察到的表观衰减。因此，尾波构成了地震记录上不均匀性留下的指纹。尾波提供了散射和衰减发生机制的决定性信息。本文对尾波进行了详细的描述，并总结了到1986年为止在这方面所做的工作。在地震散射问题的研究背景下，尾波和衰减之间的关系被强调。特别注意的是尾波的应用，估计源和介质参数。文中还介绍了尾波波形随时间变化的研究现状，以及利用尾波波形变化作为地震前兆的可能性。已采取措施，介绍用于处理负责散射的异质性的统计模型。
The analysis and interpretation of coda waves have received increasing attention since the early seventies. In the past few years interest in this subject has spread worldwide, and the study of high-frequency seismic coda waves has become a very important seismological topic. As a conclusion of the studies accomplished in this time, coda waves are considered the result of scattering processes caused by heterogeneities acting on seismic waves.PandSwaves play a particularly important role in this interaction. The process introduces an attenuation which, added to the intrinsic absorption, gives the observed apparent attenuation. Therefore, coda waves constitute a thumbprint left by the heterogeneities on the seismograms. Coda waves offer decisive information about the mechanism of how scattering and attenuation take place. This review describes coda waves in detail, and summarizes the work done in this subject to 1986. The relation between coda waves and attenuation in the context of research on seismic scattering problems is stressed. Particular attention has been given to the application of coda waves to estimate source and medium parameters. The state-of-the-art of the temporal variations of coda wave shape, and the possible use of these variations as an earthquake precursor also are presented. Care has been taken to introduce the statistical models used to deal with the heterogeneities responsible for scattering.