TY - JOUR
T1 - Rayleigh Wave Attenuation Tomography in the Crust of the Chinese Mainland
AU - Zhou, Lianqing
AU - Song, Xiaodong
AU - Yang, Xiaoning
AU - Zhao, Cuiping
N1 - The authors greatly appreciate constructive review and critical insights of two anonymous reviewers. We are also grateful to the Editor (Maureen Long) for valuable suggestions. The figures were plotted by using the GMT software (Wessel et al., 2013). This research was supported by the Natural Science Foundation of China (41774054 and U1939204), special project for basic scientific research of Institute of Earthquake Forecasting, China Earthquake Administration (2018IEF010205), and Department of Geology, University of Illinois at Urbana-Champaign.
The authors greatly appreciate constructive review and critical insights of two anonymous reviewers. We are also grateful to the Editor (Maureen Long) for valuable suggestions. The figures were plotted by using the GMT software (Wessel et al., 2013 ). This research was supported by the Natural Science Foundation of China (41774054 and U1939204), special project for basic scientific research of Institute of Earthquake Forecasting, China Earthquake Administration (2018IEF010205), and Department of Geology, University of Illinois at Urbana‐Champaign.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - In this study, we report a first major effort to measure surface wave amplitudes and to map attenuation structures of the Chinese mainland with dense modern broadband seismic networks in the country. We developed a method of phase-matched filtering to automatically extract fundamental-mode Rayleigh waves and to measure the spectral amplitudes. The results are compatible with those from the previous manual method with great improvement in efficiency. Using the automatic method, we extracted a large quantity of the amplitudes of Rayleigh waves at periods of 10 and 20 s recorded by 141 broadband stations from the China Digital Seismograph Network and 656 broadband stations from the China Regional Seismic Network. We performed tomographic inversions using the method of two-station amplitude ratios and obtained images of the surface wave attenuation maps at periods of 10 and 20 s for the Chinese mainland. The tomographic model resolution reaches 1–2° in central and eastern China, 3–5° in western China, and 5° in the southeastern margin of the Tibetan Plateau and northeastern China. The tomographic results demonstrate good correspondence with geological structures. The distribution of strong historical earthquakes indicates that in the Chinese mainland, these earthquakes occurred mainly in high-attenuation areas or the junctions between high- and low-attenuation areas.
AB - In this study, we report a first major effort to measure surface wave amplitudes and to map attenuation structures of the Chinese mainland with dense modern broadband seismic networks in the country. We developed a method of phase-matched filtering to automatically extract fundamental-mode Rayleigh waves and to measure the spectral amplitudes. The results are compatible with those from the previous manual method with great improvement in efficiency. Using the automatic method, we extracted a large quantity of the amplitudes of Rayleigh waves at periods of 10 and 20 s recorded by 141 broadband stations from the China Digital Seismograph Network and 656 broadband stations from the China Regional Seismic Network. We performed tomographic inversions using the method of two-station amplitude ratios and obtained images of the surface wave attenuation maps at periods of 10 and 20 s for the Chinese mainland. The tomographic model resolution reaches 1–2° in central and eastern China, 3–5° in western China, and 5° in the southeastern margin of the Tibetan Plateau and northeastern China. The tomographic results demonstrate good correspondence with geological structures. The distribution of strong historical earthquakes indicates that in the Chinese mainland, these earthquakes occurred mainly in high-attenuation areas or the junctions between high- and low-attenuation areas.
KW - Chinese mainland
KW - amplitude measurement
KW - attenuation tomography
KW - phase-matched filtering
KW - seismic surface waves
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U2 - 10.1029/2020GC008971
DO - 10.1029/2020GC008971
M3 - Article
AN - SCOPUS:85089852817
SN - 1525-2027
VL - 21
JO - Geochemistry, Geophysics, Geosystems
JF - Geochemistry, Geophysics, Geosystems
IS - 8
M1 - e2020GC008971
ER -