Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well. ...Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well. However, the characteristics of seismic signals （especially far-field signals） from an airgun array in a reservoir and its affecting factors （firing pressure, airgun towing depth, water level of the reservoir, etc.） has not been adequately studied. We analyzed the seismic data collected from field experiments at Binchuan Transmitting Seismic Station in 2011 and 2013 and found that （1） The similarity of seismic signals decrease with distance, which is most likely induced by the decay of signal amplitude and signal to noise ratio （SNR）; （2） The amplitudes of far-field airgun signals are almost linearly proportional to the firing pres- sure; （3） The towing depth far-field signals; （4） The signals are proportional to of airgun has less effects on the amplitudes of far-field airgun the water level of the reservoir.展开更多
基金supported by the China National Special Fund for Earthquake Scientific Research in Public Interest(No.201208004)National Natural Science Foundation of China(Nos.41222029 and 41174040)+1 种基金Basic Research and Development Operations Special Fund of the Institute of Geophysics,China Earthquake Administration(No.DQJB10A01)Foundation for Young Scientists of Yunnan Earthquake Administration(No.201407)
文摘Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well. However, the characteristics of seismic signals （especially far-field signals） from an airgun array in a reservoir and its affecting factors （firing pressure, airgun towing depth, water level of the reservoir, etc.） has not been adequately studied. We analyzed the seismic data collected from field experiments at Binchuan Transmitting Seismic Station in 2011 and 2013 and found that （1） The similarity of seismic signals decrease with distance, which is most likely induced by the decay of signal amplitude and signal to noise ratio （SNR）; （2） The amplitudes of far-field airgun signals are almost linearly proportional to the firing pres- sure; （3） The towing depth far-field signals; （4） The signals are proportional to of airgun has less effects on the amplitudes of far-field airgun the water level of the reservoir.
