Abstract
2-D crustal velocity structure and v P/v S are obtained by processing and interpretation of S-wave data from Maqen-Jingbian deep seismic sounding (DSS) profile. The result shows that there exist obvious differences in 2-D S-wave velocity structure and v P/v S ratio structure along the profile. The S-wave velocities are low and v P/v S ratio is high for the western section of the profile and Haiyuan region, while they are normal for the middle and eastern sections. The changes in lithologic characters of two major anomalous zones are discussed according to lateral variation of S-wave velocity structure and v P/v S ratio structure. It is concluded that the development and occurrence of the Haiyuan strong earthquake is not only related to tectonic activities, but also to lithologic characters of the region.
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Foundation item: State Key Basic Research Development and Programming Project (G1998040702).
Contribution No. RCEG200210, Research Center of Exploration Geophysics, China Seismological Bureau.
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Liu, Bf., Li, Sl., Zhang, Xk. et al. Study of crustal structure with S-wave data from Maqen-Jingbian profile. Acta Seimol. Sin. 16, 92–98 (2003). https://doi.org/10.1007/s11589-003-0010-0
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DOI: https://doi.org/10.1007/s11589-003-0010-0