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《Earthquake》 1994-S1
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HYDROCHEMICAL CHARACTERISTICS IN THE NORTHWEST CHINA REGION AND EARTHQUAKE PREDICTION

Zhang Xinji Wang Changling Zhang Hui (Lanzhou Institute of Seismology, SSB)  
Using the analytical method of anomaly series, we studied the evolutional characteristics of the hydrochemical anomaly group with time within a certain range before and after the moderate and strong earthquakes in the Northwest China region. The results show that the hydrochemical anomaly frequency accumulation curve before and after the earthquake exhibits three-period process: stable-accelerating ( increasing) -recovering. The changes of anomaly show a relation between accelerating (increasing ) and earthquake occurrence. This basic precursor pattern has a better recurrence to different earthquake magnitude and time scale (half a year, a month, ten days) . Using changing-velocity method anomaly frequency accumulation method, we also quantitatively described and counted the characteristics of hydrochemical precursor pattern and gave a time range of earthquake prediction. We provided prediction mark for occurrence location and magnitude of moderate and strong earthquakes in Northwest region according to the spatial distribution of anomalies and the relation between the anomaly frequency and the epicentra distance as well as the magnitude.
【CateGory Index】: P315.7
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