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EARTHQUAKE ›› 2006, Vol. 26 ›› Issue (3): 123-130.

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Analysis on variation of ambient shear stress and apparent stress at Laoshan, Qingdao area

ZHENG Jian-chang1, ZHANG Yong-xian2, PAN Yuan-sheng3, WU Yong-jia2, WAN Lian-chu3   

  1. 1. Earthquake Administration of Shandong Province, Jinan 250014;
    2. China Earthquake Network Center, CEA, Beijing 100036;
    3. Earthquake Monitoring Center of Qingdao City, Qingdao 266071, China
  • Received:2006-03-20 Revised:2006-04-13 Published:2021-11-01

Abstract: Using earthquake waveform records from numeric network in Qingdao Earthquake Monitoring Center, and setting the lower limit asML1.0, this paper calculate the variation of ambient shear stress and apparent stress in Qingdao area from 2003 to 2004. The result indicates that the raising change of stress reflected from small earthquakes with similar magnitude before moderate-earthquakes in the Laoshan sequence is not obvious, and the background stress field of Qingdao area does not show a clearly tendency change since 2003. It can be also found from the calculation and analysis that the values of ambient shear stress and apparent stress are correlative with magnitude, and the variation of these two stresses is clearly interrelated with activity behavior of the earthquake sequence.

Key words: Ambient shear stress, Apparent stress, Laoshan earthquake sequence, Qingdao area

CLC Number: