Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (5): 1572-1581.doi: 10.13278/j.cnki.jjuese.201705305

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One-Dimension Seismic Velocity Model of Shandong Province Based on Hyposat and HypoDD

Cui Xin1,2, Li Bo1, Zhu Yuanqing3, Li Yajun1, Mu Juan1, Wang Feng1   

  1. 1. Earthquake Administration of Shandong Province, Jinan 250014, China;
    2. Institute of Geophysics, CEA, Beijing 100081, China;
    3. Earthquake Administration of Shanghai Province, Shanghai 200062, China
  • Received:2017-02-07 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by Project of China Earthquake Administration (161504) and Project of Shandong Earthquake Agency of Province(JJ1703Y)

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Abstract: We collected earthquakes with local magnitude above 1.0 and travel time data in Shandong area from the year 2009 to 2016, and calculated one-dimension seismic velocity model. The process mainly included three steps:1)Initial model:to fit the travel time data and analyze the reduced travel time curve, eventually to get the initial model and its span; 2) Best model:to relocate the selected events of all possible models based on Hyposat software, according to the RMS and geophysical background, to get the best model of P phase and the possible model of S phase through adding a reasonable variable to theoretical seismic velocity ratio, then to relocate events of all models according to the RMS, and finally to reveal the best model; 3) Model test:to test the best model by using the test of natural earthquake event, blast event, horizontal epicenter comparison of three location methods, depth comparison of four location methods, HypoDD epicenter comparison of Rushan and Changdao earthquake clusters, and ultimately to get the best model. The one-dimension seismic velocity model in Shandong is:vP1=6.13 km/s, vP2=6.88 km/s, vP3=7.93 km/s, H1=22 km, H2=33 km, vS1=3.54 km/s, vS2=3.95 km/s, vS3=4.46 km/s. Besides, the location accuracy of nonlinear algorithm such as simplex generally is less dependent on the seismic velocity model; whereas the linear iterative positioning method based on the Geiger algorithm is more dependent on the seismic velocity model.

Key words: earthquake, one-dimension seismic velocity model, earthquake location, Shandong

CLC Number: 

  • P631.4
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