Japan Geoscience Union Meeting 2016

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Oral

Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS28] Seismic wave propagation: Theory and Application

Mon. May 23, 2016 3:30 PM - 5:00 PM A07 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Kiwamu Nishida(Earthquake Research Institute, University of Tokyo), Hisashi Nakahara(Solid Earth Physics Laboratory, Department of Geophysics, Graduate School of Science, Tohoku University), Jun Matsushima(School of Engineering, The University of Tokyo), Tatsuhiko Saito(National Research Institute for Earth Science and Disaster Prevention), Chair:Shunsuke Takemura(National Research Institute for Earth Science and Disaster Prevention), Kentaro Emoto(Graduate School of Science, Tohokuk University)

4:00 PM - 4:15 PM

[SSS28-14] Vector energy transfer of seismic waves and lithospheric heterogeneities beneath the US

*Piero Poli1 (1.EAPS MIT, Camrbidge USA)

Keywords:Scattering, Stochastic imaging, Wave propagation in complex media

Stochastic analysis of seismic waves can provide a different vision of the structures in the lithosphere, complementing the deterministic pictures provided by seismic tomography models. To infer the stochastic properties of the lithosphere beneath US we analyzed the vector transfer of energy using 3 component seismograms recorded at USarray seismic network. The application of theoretical scattering model based on the Markov approximation permits to interpret the vector energy ratio and derive statistical information about the heterogeneity distribution in the analyzed medium. By using high frequency seismic waves a continental vision of the scattering properties of the US lithosphere is obtained by the regionalization of our observations. The derived map of the lithospheric scattering reveals strong correlation of the scattering property with well-known geological features of the US lithosphere. High scattering is observed in tectonically active east US and highly deformed central regions, while low scattering is characteristic of old cratonic regions in the eastern US.