关键词: 电火花震源, GI枪震源, 小多道地震, 活动断裂, 台湾海峡

Abstract: Marine seismic zonation is closely related to the detection and identification of active fault structures in Marine areas. Based on the geophysical exploration in the fault-uplift zone of south-eastern coast of Fujian, this paper compares the fault interpretations between the GI gun source profile and the sparker source profile, three basement faults and two shallow faults with small vertical extension have been found, which have been active since the late Pleistocene. It is found that basement faults which can be identified by both GI gun profile and sparker profile, while the small faults can only be identified by the sparker profile. For the three basement faults, the locations of the fault strata and the geometry of fault on the two profiles, however, due to the influence of resolution, there are imaging differences in the strate form around the fault and the distribution pattern of secondary faults. The similarity of fault detection results shows the effectiveness?of the two methods, while the difference of profile imaging shows the necessity of combined detection in practical work. Therefore, it is necessary to attach importance to the combination of multiple detection methods in Marine seismic zonation and Marine seismic hazard assessment in order to conduct more accurate identification of fault activity.

Key words: sparker source, GI gun source, mini-multichanel seismic, active fault, Taiwan strait