Amplitude variation characteristics of active source airgun signals at Qilian Mountain |
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| Authors: | Xuzhou Liu Yuansheng Zhang Zhiguo Liu Manzhong Qin Rui Zou Xiao Guo |
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| Affiliation: | 1.Gansu Lanzhou Geophysics National Observation and Research Station, Lanzhou 730000, China2.Lanzhou Institute of Geotechnique and Earthquake, China Earthquake Administration, Lanzhou 730000, China |
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| Abstract: | In this study, Qilian Mountain active source airgun signals recorded at 79 stations were obtained after stacking waveforms from July 2015 to December 2016. Based on analysis of the amplitude variation characteristics of the airgun signals, the following conclusions were drawn:along the NW-SE fault distribution direction of the Qilian Mountain area, the decrease in amplitude of airgun signals was relatively slow in relation to the epicentral distance, while the decrease in amplitude in the direction perpendicular to the fault was relatively fast. This difference may be related to the energy loss of seismic waves reflecting and scattering by the regional faults mainly distributed along the NW-SE direction, which are caused by tectonic compression of the Qinghai-Tibet and Alxa blocks. |
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| Keywords: | airgun signal amplitude variation seismic wave di-rectional difference Qilian Mountain |
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