OBSERVED STRAIN CHANGES FROM 4-COMPONENT BOREHOLESTRAINMETER NETWORK BEFORE 2008 WENCHUAN EARTHQUAKE
Qiu Zehua;Tang Lei; Zhou Longshou; and Kan Baoxiang
Institute of Crustal Dynamics, CEA, Beijing 100085
Abstract Following three criteria to testify the precursory anomaly before a great earthquake is adopted, 1) a normal background; 2) not interferences; 3) close correlation to the event. According to these criteria, no obvious abnormal changes related to the Wenchuan earthquake were found in preliminary investigation on the recordings of the 4component borehole strainmeters installed in the Tenth Five Year Project of CEA. A further study on the principal orientations of strain changes before the great shock shows that they did not all point to the epicenter.
Key words ：
Wenchuan earthquake
4-component borehole strainmeter
anomalous change
earthquake precursory
principal orientation
Received: 01 January 1900
Corresponding Authors:
Qiu Zehua
Cite this article:
Qiu Zehua,Tang Lei,Zhou Longshou et al. OBSERVED STRAIN CHANGES FROM 4-COMPONENT BOREHOLESTRAINMETER NETWORK BEFORE 2008 WENCHUAN EARTHQUAKE[J]. , 2009, 29(1): 1-5.
Qiu Zehua,Tang Lei,Zhou Longshou et al. OBSERVED STRAIN CHANGES FROM 4-COMPONENT BOREHOLESTRAINMETER NETWORK BEFORE 2008 WENCHUAN EARTHQUAKE[J]. jgg, 2009, 29(1): 1-5.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2009/V29/I1/1
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