Study on Azimuth Variation of Airgun Signal Propagation

作者：HE Suge,ZHOU Qingyun

摘要：Based on the data recorded by the observation network during the intensive excitation period from November to December 2015 at Binchuan Earthquake Signal Transmitting Seismic Station(BESTSS)in Yunnan Province,the noise in waveform recording is removed by S-transform template filtering method,and the azimuth of airgun signal propagation is calculated and analyzed from the horizontal waveform recordings.The results show that:①the azimuth angle of airgun signal after propagation is sensitive to stress change,and can clearly reflect the diurnal variation of tidal stress,which can be used to monitor the change of stress state in crustal medium;②the azimuth angle of airgun signal in some stations has changed abruptly after propagation on December 4,which may be related to the change of airgun source;③five-shot superposition or fivepoint smoothing of azimuth angle of single shot are carried out for airgun signals in stations far away from epicenter,and results show that azimuth angle from superposition or smoothing is more stable and has clear diurnal variation characteristics after propagation.

发文机构：Yunnan Earthquake Agency

关键词：AirgunsourceAZIMUTHCHANGES-TRANSFORMTEMPLATEmatchedFILTERINGCRUSTALmediumCHANGE

分类号： F42[经济管理—产业经济]