STUDY ON PRECURSORY STRAIN CHANGES OF WENCHUAN EARTHQUAKE WITH ORA METHOD
Qiu Zehua 1) ;Zhou Longshou 1) ; and Chi shunliang 2)
1)Institute of Crustal Dynamics,CEA,Beijing 1000852)Earthquake Administration of Hebi city, Henan Province, Hebi 458000
Abstract Frequent pulses, whose period from minutes to hours, were recorded with the YRY4 strainmeter at Guza station before the Wenchuan earthquake in 2008. Via highpass filtering, strong correlation between the recorded pulses and the main shock is revealed. In order to prove,an Overrun Rate Analysis (ORA) is carried out for a systematic and quantitative examination of the abnormal changes, based on three criteria with respect to the periods for before, during and after the main shock, respectively. The phenomenon does not seem to be close to the so called precursory longperiod wave preceding a macroquake but is similar to the acoustic emission prior to the fracture of rocks.
Key words ：
Wenchuan earthquake
earthquake precursor
borehole strainmeter observation
four component borehole strainmeter
Overrun Rate Analysis(ORA)
Received: 01 January 1900
Corresponding Authors:
Qiu Zehua
Cite this article:
Qiu Zehua ,Zhou Longshou ,and Chi shunliang . STUDY ON PRECURSORY STRAIN CHANGES OF WENCHUAN EARTHQUAKE WITH ORA METHOD[J]. , 2009, 29(4): 1-4.
Qiu Zehua ,Zhou Longshou ,and Chi shunliang . STUDY ON PRECURSORY STRAIN CHANGES OF WENCHUAN EARTHQUAKE WITH ORA METHOD[J]. jgg, 2009, 29(4): 1-4.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2009/V29/I4/1
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