文章基本信息

标题：Effects of water domains on seismic wavefields: A simulation case study at Taal volcano, Philippines
本地全文：下载
作者：Yuta Maeda ; Hiroyuki Kumagai
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2013
卷号：65
期号：2
页码：85-96
DOI：10.5047/eps.2012.07.004
出版社：Springer Verlag
摘要：We examined the effects of water domains on seismic wavefields at the Taal volcano, Philippines, where there is a summit crater lake on an active volcanic island surrounded by a caldera lake.We conducted forward waveform simulation and synthetic waveform inversion using the 3D finite-difference method for various models with and without the water lakes.Our study demonstrated the existence of both near-and far-field effects of the water domains.The near-field effect is related to source excitation affected by a water domain, and the far-field effect is caused by dispersion of Rayleigh waves propagating through a water domain.Our study also showed that the replacement of water by a vacuum rather than by a solid medium provides a better approximation of a water domain.A water domain has considerable effect on seismic waveforms and must be properly treated when the waveform period is shorter than 2 s, even if recording stations lie in the near field.If the waveform period is longer than 5 s, a water domain has a minor effect on seismic waveforms and may be replaced by a vacuum. Key words Volcano seismology moment tensor inversion finite-difference method Taal volcano.
关键词：Volcano seismology ;moment tensor inversion ;finite-difference method ;Taal volcano