Spatial variation of lithospheric heterogeneity on the globe as revealed from transverse amplitudes of short-period teleseismic <I>P</I>-waves
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概要
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We systematically characterized the medium heterogeneity of the lithosphere by analyzing transversecomponent amplitudes of teleseismic <I>P</I>-waves from shallow earthquakes in short periods of 0.5 to 4 Hz. Normalized transverse amplitudes, which are less affected by a layered structure, were measured at each station of the IRIS GSN network. The data revealed significant regional differences in lateral heterogeneity of the lithosphere, with small amplitudes observed at stations on stable continents and large normalized transverse amplitudes observed in seismically active regions, such as island arcs or collision zones. These spatial changes are consistent with the tectonic settings of each station. However, large normalized transverse amplitudes were also observed in regions of very low seismicity and in regions where no seismic activity has been recognized, which may indicate the existence of medium heterogeneity in the lithosphere that has been formed in ancient times.
- 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文
著者
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Nishimura Takeshi
Department Of Biological Sciences Tokyo Metropolitan University
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Kubanza Mungiya
Department Of Geophysics Graduate School Of Science Tohoku University
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Sato Haruo
Department of Applied Chemistry, Faculty of Engineering, Keio University
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