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Journal: Bulletin of Seismological Society of America  2016 No.4  Share to Sinaweibo  Share to QQweibo  Share to Facebook  Share to Twitter    clicks:740   
Title:
Detecting Multiple Surface Waves Excited by the 2011 Tohoku‐Oki Earthquake from GEONET Observations
Author: Jieming Niu, Caijun Xu, Lei Yi
Adress: Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, Hubei, China
Abstract:

Multiple surface waves circling the earth excited by the 2011 Mw 9.0 Tohoku‐Oki earthquake were well recorded by both global and regional broadband (BB) seismometer networks. In this study, we explore the ability of kinematic solutions of Global Positioning System (GPS) observations from GEONET to reveal the phases of multiple surface waves. Even though multipath effects and common mode errors are not reduced, the wave packages of G2/G3 of Love waves and R2/R3 of Rayleigh waves are clearly identified from the raw GPS displacement time series in the 100–500 s periods, which show great coherency with BB seismograms in both amplitude and time. The arrival times of these wave packages tally with the synthetic value by the group velocities from the global dispersion model. We consider that kinematic solutions of continuous GPS measurement can act as a supplementary tool for studying global surface‐wave dispersion.

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