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EARTHQUAKE ›› 2003, Vol. 23 ›› Issue (4): 21-26.

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Evolutional characteristics of ground deformation observed along the Qilian Mt.Before the Kunlun Mountain MS 8.1 earthquake

NIU An-fuα1, ZHANG Jingα1, ZHANG Xiao-qing2, GAO Yuan3, YAN Xu-dong1   

  1. 1. Center for Analysis and Prediction, CSB, Beijing 100036;
    2. Seismological Bureau of Qinghai Province, Xining 810001;
    3. Wudu Seismic Station, Gansu Province, Wudu 746000, China
  • Received:2002-12-30 Revised:2003-05-19 Online:2003-10-31 Published:2021-12-21

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Abstract: A series of deformation anomalies with g reat amplitude along the Qilian seismic belt have been observed prior to the Kunlun mountain MS 8.1 earthquake.Studied the characteristics of g round tilt, stress and st rain, we have obtained the following results:the amplitudes and duration of tilt s observed at Ledu, Lanzhou, Menyuan and Sunan station satisfied the general statistic relat ionship between them and the magnitudes of st rong earthquakes;Observed st ress curve has obvious turn, the di rection of maximum stress change is closely related to the azimuth of earthquake location.The observed st rain cure at Wudu station shows clear anomaly, and the direction of maximum shear st rain is NW 23°~ 44°, and the strain ampli tude also satisf ied the above-mentioned relat ionship.So the researched results demonstrated that the st ress, strain and tilt anomalies are related to the Kunlun Mountain MS 8.1 earthquake.

Key words: St ress, Strain, Tilt, Kunlun Mountain MS 8.4 g reat earthquake

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