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??????????????24??????????????????????????????α?????????????????????????о????????α???????????????????????????????????????α????????????????????????????????????????????????????????????仯?????????????????′?1994??????????????????????????????????????????????2??3???о?????????????????????????γ?????????????????????????е????????????????????????????????о??????????Χ???????????????????????????????????????????????????????й??

TEMPORAL AND SPATIAL EVOLUTION CHARACTERISTICS OF FAULT ACTIVITY BEFORE AND AFTER ZHANGBEI Ms6.2 EARTHQUAKE

We analyzed 24 observational data of temporary fault crossing leveling measurement in the Capital region of China and calculated the vertical fault deformation rate.With the principal component analysis method, we made a rate synthesizing from the vertical fault displacement rate in the study area, and then carried out a deep analysis of the deformation anomaly characteristics before and after the Zhangbei earthquake in the view from space and time. The results show that the part of stations in the Capital Region had some certain anomalies before the Zhangbei earthquake. In the view from time, the observation curves generally began to appear acceleration or turning simultaneously from 1994, the earthquake broke out after restoring to its original level, or exception to the maximum. From the point of space, 2 to 3 years before the earthquake the studied area as a whole converted to pressure from the tensile, and gradually formed a pressure zone around the epicenter area and the pressure gradually decreased in the area far from the epicenter. After the Zhangbei earthquake, the studied area emerged a wide range of tensile in a relatively stable spatial distribution, which may be related to the full release of the stress.