Dynamic pattern characteristics of fault deformation and gravity field in the development process of Yongdeng M S=5.8 earthquake |
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| Authors: | Zai-Sen Jiang Yi-Qing Zhu Qing-Liang Wang Shuang-Xu Wang and Bing Chen |
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| Institution: | (1) The Second Crustal Deformation Monitoring Center, State Seismological Bureau, 710054 Xi’an, China |
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| Abstract: | In this paper, the fault deformation abnormality, dynamic evolution features of gravity and vertical deformation field in
the seismogenic process of the Yongdeng, Gansu Province earthquake on July 22, 1995 are studied primarily. There appeared
α-β-γ tri-stage anomaly at three sites near the epicenter, and there appeared anomalies of step and sudden jump at more than
10 sites in outer region since 1993. The high value area before shock, coseismic effect and process of recovery aftershock
were monitored by portable gravity data. Data reflects the changing process of fault movement from the quasi-linear to the
nonlinear in the near source region during seismogenic development of the Yongdeng earthquake and evolution of gravity field
from heterogeneity of seismogenic term to quasi-homogeneity of postseismic term. There exists close relationship between strong
earthquake and dynamic evolution of regional stress-strain field. Considering all above, the experience and lessons in this
medium-short term prediction test are summarized. |
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| Keywords: | Yongdeng earthquake crustal deformation gravity field variation precursor pattern |
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