ONSHORE-OFFSHORE SEISMIC DATA PROCESSING AND PRELIMINARY RESULTS IN NE SOUTH CHINA SEA

In order to study the crustal structure across the Littoral Fault Belt and the transition zone of South China mainland and NE South China Sea, an onshore-offshore deep seismic experiment was carried out for the first time offshore Shantou, Guangdong Province. Air-gun arrays were used as seismic sources and five portable land stations were set up to record the seismic signals. The main flow steps for data processing were introduced in details. Three programs were written to convert the raw data to common data format. Preliminary results were obtained by using these three programs together with the seismic softwares of SAC and SU. Abundant crustal information and deep seismic phases were recognized in the seismic record sections. The apparent velocities of Pg and PmP are about 5.14 km·s~(-1) and 7.14—7.30 km·s~(-1) respectively. All these provide a strong base for the study of crustal structure for the next step.