Checkerboard resolution test for natural earthquake tomography of volcanic island in Hachijojima

PreviousNext No AccessProceedings of the 13th SEGJ International Symposium, Tokyo, Japan, 12–14 November 2018Checkerboard resolution test for natural earthquake tomography of volcanic island in HachijojimaAuthors: Kentaro OmoriYoshiya OdaKentaro OmoriDept.of Civil and Environmental. Eng., Tokyo Metropolitan UniversitySearch for more papers by this author and Yoshiya OdaDept.of Civil and Environmental. Eng., Tokyo Metropolitan UniversitySearch for more papers by this authorhttps://doi.org/10.1190/SEGJ2018-126.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Grasping the underground velocity structure of volcanoes to evaluate the activity of the volcanoes, which increase not only the possibility of estimating the presence and location of magma but also the accuracy of determining the hypocenter of volcanic earthquakes, is very important. As an effective method to grasp the velocity structure of the volcanoes, there is natural earthquake tomography. In natural earthquake tomography targeting a single volcano, in order to improve resolution, temporary seismic observation is carried out in general. However, since the number of observation points and observation period are limited, it is important to grasp the presumable resolution in advance. The purpose of this study, therefore, is to examine, by numerical experiments, how much resolution we can estimate the underground velocity structure by performing temporary seismic observation with how many observation points and observation period, when carrying out natural earthquake tomography on Hachijojima of volcanic islands in Tokyo. In order to evaluate the resolution of the velocity structure using natural earthquake tomography, we have employed a checkerboard resolution test (CRT). In this study, we conducted a parametric study in which the number of observation points and the number of earthquakes were changed. In addition, since the seismicity of beneath Hachijojima was relatively low, we needed to use earthquakes located relatively far from analysis area. Therefore, we have also investigated the influence of velocity inhomogeneity outside the analysis area by changing the rate of inhomogeneity outside the analysis area. Keywords: natural earthquake tomography, checkerboard resolution test (CRT), HachijojimaPermalink: https://doi.org/10.1190/SEGJ2018-126.1FiguresReferencesRelatedDetails Proceedings of the 13th SEGJ International Symposium, Tokyo, Japan, 12–14 November 2018ISSN (online):2159-6832Copyright: 2019 Pages: 588 publication data© 2018 Published in electronic format with permission by the Society of Exploration Geophysicists of JapanPublisher:Society of Exploration GeophysicistsSociety of Exploration Geophysicists of Japan HistoryPublished Online: 29 Apr 2019 CITATION INFORMATION Kentaro Omori and Yoshiya Oda, (2019), "Checkerboard resolution test for natural earthquake tomography of volcanic island in Hachijojima," SEG Global Meeting Abstracts : 491-494. https://doi.org/10.1190/SEGJ2018-126.1 Plain-Language Summary Keywordsnatural earthquake tomographycheckerboard resolution test (CRT)HachijojimaPDF DownloadLoading ...