2011年安庆MS4.8地震前地下流体典型异常特征及机理研究

Abstract

Abstract: This paper summarized and analyzed typical underground fluid anomalies appeared before Anqing M_S4.8 earthquake occurred on Jan. 19th, 2011. The results show that there are many anomalies before the earthquake. According to time scale, it includes medium-term trend anomalies and short-term anomalies. They also have certain regularity on spatial evolution. During medium-term stage, it has two types of anomalies, one is water level anomalies and the other is water temperature anomalies. Water level anomalies scattered in the range of 100~400 km, and the water level of outlying wells show rising trend, and the water level of wells close to epicenter show downward trend. And water temperature anomalies are distributed in the range of 150 km. During short-term stage, anomalies are widely distributed along Tanlu fault. Moreover, they migrated far from epicenter in short-term stage and migrated back near to the epicenter in impending-term stage.

Key words: Underground fluid, Characteristics of earthquke anomalies, The 2011 Anqing M_S4.8 earthquake

CLC Number:

P315.7

MIAO A-li,WANG Jun,YE Bi-wen,WANG Wei,SHEN Hong-hui,ZHANG Yi. Typical Underground Fluid Anomalies before the 2011 Anqing M_S4.8 Earthquake and Mechanism Discussion[J]. EARTHQUAKE, 2017, 37(3): 180-189.

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Typical Underground Fluid Anomalies before the 2011 Anqing M_S4.8 Earthquake and Mechanism Discussion

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Typical Underground Fluid Anomalies before the 2011 Anqing MS4.8 Earthquake and Mechanism Discussion

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Typical Underground Fluid Anomalies before the 2011 Anqing M_S4.8 Earthquake and Mechanism Discussion