华东中强震的构造分类及地震活动图像中、 短期异常特征

Abstract

Abstract: The current moderately strong earthquakes in East China have been preliminarily classified according to the tectonics based on information from laboratory study results-it presents the similar fracture pattern and characteristics of precursory evolution to similar structural tectonics on the action of extra adding loads. Furthermore, we have analyzed and studied the seismicity patterns and some general and specific characteristics of seismic pattern before 19 earthquakes. The results show some features as follows: ① Most cases have medium-term seismological anomaly of 2 years, being mainly seismic band and enhancement of patterns; ② Medium-short term of 1 year calm occurs after the emerging of seismic bands, and then the concentrated or contracted patterns of 0.5 year before the earthquakes; ③ In most cases, there is principally seismic quiescence around epicenter about a short period of 3 to 6 months before the earthquakes; ④ Partly, for a short time before the earthquakes, significance seismic events occurred near the epicenter region; ⑤ Seismic anomaly patterns might be different before various tectonic types of earthquakes; ⑥ Moderately strong earthquakes occurred in East China are mostly dislocation slip type of earthquakes that its fracture along with pre-existing faults, and the focal mechanical behavior mainly belong to stretch type, the anomaly characteristics of stretch and compression type probably have some differences. Nevertheless, it's necessary to discuss further the cause and definition because of insufficiency of earthquake examples.

Key words: Seismicity, Medium-short term anomaly, Significance earthquake, East China

CLC Number:

ZHOU Cui-ying, JIANG Hai-kun, ZHOU Huan-peng, HOU Hai-feng, LI Yong-hong. Structure classification of moderately strong earthquakes in East China and the characteristics of medium-and short-term anomalies of seismicity pattern[J]. EARTHQUAKE, 2004, 24(4): 87-96.

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Structure classification of moderately strong earthquakes in East China and the characteristics of medium-and short-term anomalies of seismicity pattern

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