An Experimental Study on Modulating the Large Volume Airgun Array Signals through Asynchronous Excitation

作者：YANG Wei,WANG Baoshan,LUO Mingzhang,LI Xiaobin,CHEN Yong

摘要：Large volume airgun arrays have been widely used in exploring and monitoring underground structures for nearly a decade.Nowadays,large volume airgun arrays adopt the synchronous excitation mode,and source characteristics are controlled by the source signal of a single airgun,which to some extent limits its application.In order to realize the asynchronous excitation of the airgun array,we developed a new firing system for the airgun array,and carried out a field experiment in the Binchuan Fixed Airgun Signal Transmission station to study the influences of the asynchronous excitation on the source signal.The experimental results show that:the newly developed airgun array firing system can ignite the airguns according to the setting time series with high precision.By designing the excitation time series,the asynchronous excitation can enhance the energy of airgun source signal at 3-5 Hz,and reduce the energy of pressure pulse wave at 6-18 Hz.The signal detection capability of the asynchronous excitation with time series mode is equivalent to the synchronous excitation.

發文機構：Key Laboratory of Seismic Observation and Geophysical Imaging School of Earth and Space Sciences School of Electronic Information Yunnan Earthquabe Agency Institute of Geophysics and Geodynamics

關鍵詞：ACTIVESOURCELargeVOLUMEairgunASYNCHRONOUSEXCITATIONSOURCEcharacteristicsHighPRECISION

分類號： P[天文地球]