Abstract:In order to explore the characteristics of air-gun source, we deploy two circular arrays with portable seismographs around Binchuan Air-Gun Source Transmitting Seismic Station in February 2017. To get the radiation pattern of air-gun’s signals, we use the data received by circular arrays to get the signal’s duration, energy, and the area of S transform image. We get a preliminary result: 1) Differences can be seen obviously between signals from different azimuth. 2) Air-gun array formed by four air-guns shows a period of 90° and its main directions are NE, SE, SW and NW; single air-gun shows no clear periodicity and its main directions are NE, SW and NW. 3) The main cause of the radiation pattern is high-pressure-gas injection, which has strong directionality, and there is coupling between bubble and borehole wall. 4) If the air-gun signal ray path goes through a certain scale of water, its energy attenuation is smaller and time-frequency spectrum is smooth.