Skip to Main Content
GEOREF RECORD

Surface-wave tomography of eastern and central Tibet from two-plane-wave inversion; Rayleigh-wave and Love-wave phase velocity maps

Li Lun and Fu Yuanyuan
Surface-wave tomography of eastern and central Tibet from two-plane-wave inversion; Rayleigh-wave and Love-wave phase velocity maps
Bulletin of the Seismological Society of America (March 2020) 110 (3): 1359-1371

Abstract

An understanding of mantle dynamics occurring beneath the Tibetan plateau requires a detailed image of its seismic velocity and anisotropic structure. Surface waves at long periods (>50 s) could provide such critical information. Though Rayleigh-wave phase velocity maps have been constructed in the Tibetan regions using ambient-noise tomography (ANT) and regional earthquake surface-wave tomography, Love-wave phase velocity maps, especially those at longer periods (>50 s), are rare. In this study, two-plane-wave teleseismic surface-wave tomography is applied to develop 2D Rayleigh-wave and Love-wave phase velocity maps at periods between 20 and 143 s across eastern and central Tibet and its surroundings using four temporary broadband seismic experiments. These phase velocity maps share similar patterns and show high consistency with those previously obtained from ANT at overlapping periods (20-50 s), whereas our phase velocity maps carry useful information at longer periods (50-143 s). Prominent slow velocity is imaged at periods of 20-143 s beneath the interior of the Tibetan plateau (i.e., the Songpan-Ganzi terrane, the Qiangtang terrane, and the Lhasa terrane), implying the existence of thick Tibetan crust along with warm and weak Tibetan lithosphere. In contrast, the dispersal of fast velocity anomalies coincides with mechanically strong, cold tectonic blocks, such as the Sichuan basin and the Qaidam basin. These phase velocity maps could be used to construct 3D shear-wave velocity and radial seismic anisotropy models of the crust and upper mantle down to 250 km across the eastern and central Tibetan plateau.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 110
Serial Issue: 3
Title: Surface-wave tomography of eastern and central Tibet from two-plane-wave inversion; Rayleigh-wave and Love-wave phase velocity maps
Author(s): Li LunFu Yuanyuan
Affiliation: Sun Yat-sen University, School of Earth Sciences and Engineering, Guangdong, China
Pages: 1359-1371
Published: 20200317
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 69
Accession Number: 2020-039338
Categories: SeismologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
N27°00'00" - N37°00'00", E79°00'00" - E99°00'00"
Secondary Affiliation: China Earthquake Administration, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202025
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal