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EARTHQUAKE ›› 2015, Vol. 35 ›› Issue (2): 34-42.

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Crustal Thickness and Poisson’s Ratio of Hebei and Adjacent Areas from Teleseisimic Receiver Functions

GONG Meng1,2, LI Xin-fu3, ZHANG Su-xing1, LUO Yan4, ZENG Xiang-fang5, LIU Li1   

  1. 1. Earthquake Administration of Hebei Province, Hebei Shijiazhuang, 050000, China;
    2. Institute of Geology, CEA, Beijing 100081, China;
    3. China University of Geoscience, Beijing 100083, China;
    4. Institute of Earthquake Science, CEA, Beijing 100081, China;
    5. Key Laboratory of Computational Geodynamics, CAS, Beijing 100049, China
  • Received:2014-05-15 Online:2015-04-30 Published:2020-06-24

Abstract: We collect waveforms of teleseismic events which occurred from January 2007 to October 2011 from 174 broadband seismic stations deployed in Hebei province and adjacent areas and use H-k stacking method to calculate the average crustal thickness and Poisson’s ratios in the study area. In order to obtain reliable receiver functions, the broadband seismograms of 488 teleseismic earthquakes occurred in the epicentral distance range from 30 degree to 90 degree with magnitudes larger than Mb6.0 were collected. The results show that the crustal thickness exhibit conspicuous lateral heterogeneity and correlate well to the regional geological?tectonic features. Poisson's ratio is equated with global model's estimates which fluctuate at about 0.25. Crustal thickness correlates positively to the topography and the Taihang mountain range is the transition zone of thick and thin crustal thickness. Crustal thickness in the north and south of Shanxi Earthquake Zone exists obvious difference and Poisson's ratios in Tatong, Ningwu and Anze basins are greater than 0.3. Crustal thickness in the Zhangbo Earthquake Zone decreases from west to north and its Poisson’s ratio has conspicuous lateral heterogeneity. The Huabei basin's thin crust and low Poisson’s ratio may correlate with the North China craton delamination.

Key words: Crustal thickness, Poisson ratio, Receive function, H-k stacking, Hebei and adjacent areas

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