Crustal P-wave velocity beneath the Loess Plateau and its surrounding region

Fang Wei; Bai Chaoying; Peng Jianbing

doi:10.3969/j.issn.0253-3782.2013.03.004

Acta Seismologica Sinica > 2013 > 35(3): 315-327. > DOI: 10.3969/j.issn.0253-3782.2013.03.004

Fang Wei, Bai Chaoying, Peng Jianbing. 2013: Crustal P-wave velocity beneath the Loess Plateau and its surrounding region. Acta Seismologica Sinica, 35(3): 315-327. DOI: 10.3969/j.issn.0253-3782.2013.03.004

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Crustal P-wave velocity beneath the Loess Plateau and its surrounding region

1.
Department of Geophysics, College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
2.
Earthquake Administration of Shaanxi Province, Xi’an 710068, China

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Received Date: January 16, 2012
Revised Date: September 16, 2012
Published Date: April 30, 2013

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Abstract

Abstract

A simultaneous travel time inversion procedure was developed in collaboration with a modified shortest path algorithm, which was applied to a bent ray tracing forward calculation. The conjugate gradient algorithm was used to solve a damped least square problem. The crustal P-wave velocity structure beneath the Loess Plateau and its surrounding regions of China were tomographically imagined down to the depth of 50 km by inverting P wave travel time data from local and regional earthquakes. The result indicates that lateral high velocity anomaly regions generally coincide with the seismically active zones, while vertical velocity variations show existence of a low velocity zone.
- 3D simultaneous inversion,
- crustal velocity structure,
- Loess Plateau,
- Fenwei seismic belt

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References

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