Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (3): 922-933.doi: 10.13278/j.cnki.jjuese.20170150

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Spatial Distribution of b-Value in Haicheng Region, Liaoning Province

Zheng Que, Liu Cai, Tian You   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2017-09-07 Online:2018-05-26 Published:2018-05-26
  • Supported by:
    Supported by National Natural Science Foundation of China (41430322, 41474030) and National Key Basic Research Program of China ("973" Program) (2016YFC0600301)

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Abstract: The frequency-magnitude distribution (FMD) is one of the most important empirical equations. The parameter b, presenting the characteristics of foreshocks and aftershocks, is often used in the tectonics and seismic hazard assessment. Earthquakes frequently occurred in Jinzhou fault zone before. Since the Haicheng Ms 7.3 earthquake occurred in 1975, the Haichenghe-Dayanghe fault interlaced with the Jinzhou fault has been active. An earthquake with Ms 5.6 occurred in Xiuyan in the year of 1999, and Gaizhou has high seismic activities recently as well. In this study, the spatial distribution of b-values were used to detect current stress state of Haicheng region. Relocated earthquake data by double-difference (DD) algorithm can significantly improve the location precision, although suffer from the degeneration of data completeness. We collected arrival-time data recorded by the seismic network, and used the DD method from 1981 to 2005. The spatial distribution of b-values from routine catalogue and data after using DD method were compared and analyzed,which revealed that DD data can be used for b-value calculation and has higher accuracy when the earthquakes clustered. We got the vertical and horizontal variation of b-values using gridding techniques with DD data in Haicheng and Xiuyan area. Our results revealed that the b-values were varied spatial significantly, ranging from 0.6 to 1.8, and decreased with depth. The Xiuyan and Gaizhou area with low b-values may indicate the area most likely seismogenic for future large earthquakes. The Hunhe area and the southeast part of Haichenghe-dayanghe fault have high b-values,indicating a low opportunity for seismic hazard. Near the intersection of Jinzhou and Haichenghe-Dayanghe faults, the b-value is closed to 1.0, such a stable stress suggests a low probability of future large earthquakes.

Key words: Haicheng, Liaoning, characteristic of b-value, double-difference method, seismic hazard

CLC Number: 

  • P631.4
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