ANALYSIS OF APPLICATION OF AIR GUN TO DEEP CRUST EXPLORATION
Yang Guangliang 1) ; Zhu Yuanqing 2) ; and Sun Lijian 2)
1) School of Ocean and Earth Science, Tongji University, Shanghai 2000922) Earthquake Administration of Shanghai Municiplity, Shanghai 200062
Abstract On the basis of the drilling data at a seismostation in Shanghai, the absorption medium model of cover and deep crust layer was established. The absorption and attenuation of airgun wavelet in the absorption medium were analyzed. The relation between the fault length which can be resolved and the depth of the earth layer. The results show that the signal’s energy decays faster within 5 km than within deep crust, and with the increases depth of the attenuation rate reduces. In depth of 25 km, the attenuation reaches 93 dB. When main frequency of the air gun’s wavelet is 6 Hz,the attenuation of wavelet is very small (the decay rate of lowfrequency can be ignored), the depth of the earth layer which can be resolved from 75 m increases to 290 m gradually.
Key words ：
air-gun wavelet
spherical spreading
layer absorption
frequency attenuation
resolution
Received: 01 January 1900
Corresponding Authors:
Yang Guangliang
Cite this article:
Yang Guangliang ,Zhu Yuanqing ,and Sun Lijian . ANALYSIS OF APPLICATION OF AIR GUN TO DEEP CRUST EXPLORATION[J]. , 2009, 29(2): 39-42.
Yang Guangliang ,Zhu Yuanqing ,and Sun Lijian . ANALYSIS OF APPLICATION OF AIR GUN TO DEEP CRUST EXPLORATION[J]. jgg, 2009, 29(2): 39-42.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2009/V29/I2/39
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