Group velocity estimation of Rayleigh wave of crust and upper mantle based on the broadband seismic data in Vietnam East Sea

Hung Nguyen Tien; Giang Ha Thi; Minh Nguyen Le; Satoru Tanaka; Yasushi Ishihara; Long Ha Vinh; Khoi Le Quang

doi:10.15625/1859-3097/17/4B/13008

Author affiliations

Authors

Hung Nguyen Tien Institute of Geophysics, VAST Graduate University of Science and Technology, VAST
Giang Ha Thi Institute of Geophysics, VAST
Minh Nguyen Le Institute of Geophysics, VAST
Satoru Tanaka Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan
Yasushi Ishihara Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan
Long Ha Vinh Institute of Geophysics, VAST
Khoi Le Quang Institute of Geophysics, VAST

DOI:

https://doi.org/10.15625/1859-3097/17/4B/13008

Keywords:

Group velocity of Rayleigh, dispersion curve, multiple filter analysis.

Abstract

In this study, the Rayleigh wave group velocity (V_gr) of Vietnam East Sea is determined by using 36,195 broadband velocity seismograms recorded by 95 seismic stations from 381 events with magnitude larger than 6.0, depth lower than 100 km, from 2000 to 2016 and applying the multiple filter analysis, integrated into Computer Program Seismology (CPS) by Herrmann and Ammon (2002). Using 2,600 high quality dispersion curves of V_rg passing through the Vietnam East Sea, the results show that: (i) The dispersion curves of V_gr in the continent region have the function graph of grade 3 with a minimum (at V_rg ≈ 2.8 km/s; T = 20 - 26 s) and a maximum (at V_rg ≈ 3.9 km/s; T = 50 - 90 s) and the dispersion curves of V_gr in the ocean have the function graph of grade 2 with a maximum (≈ 3.9 km/s; T = 40 - 90 s); (ii) At the period lower than 40s, the V_rg in Vietnam East Sea is from 2.8 km/s to 4.0 km/s and reaches a maximum at the center area; (iii) At the period over 50s, the V_rg in Vietnam East Sea is from 3.2 km/s to 4.2 km/s and the low V_gr area appears along the Red river, Con Co island, Dai Loan island, Visayas, Philippines and Borneo island.

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