关键词: 遥感解译, 活动构造, 多源信息融合

Abstract: The occurrence of earthquake is related to active structure,so the active structure is key to seismogeological study.For the broad field of vision of RS technology,it can play an important role in macro-active structure study.Furthermore,the ability of multi-temporal,multi-spectral,high-resolution,dynamic monitoring and so on also makes RS a very important tool for geological application.The studies of active fault using RS image were based on optical image before,therefore the study depends considerably on the fieldwork because of the limited information available from image.In the paper,we combine optical image with SAR image and implement image fusion,as a result,we can obtain more information and interpret more features of active fault.The paper puts emphasis on the study of distribution of active fault in Hainan Island utilizing satellite image.First,MSS,TM and SAR images are selected as the basis datum;preprocessing and image enhancements are manipulated for data fusion to highlight more features of geological body and extract more texture,tonal and other structure features to improve the efficiency of RS image greatly.Then the expression of geological physiognomy is analyzed,the symbol for interpretation is established,and each geological body on image is analyzed.At last,the geologic and geomorphic feature of the study area is analyzed generally,and detailed description of development of active fault in the northern area of Hainan Island is presented.After image processing and interpretation,we can conclude that there are mainly three groups of active faults striking EW,NW and NE,respectively in Qiongbei area.The EW-and NW-trending faults have great effect on the geologic and geomorphic development of the region.The image feature of active fault is clear,the phenomena of crustal movement such as linear distributed lake,volcano crater and flexed coastline,exist on the earth surface or near surface.The three groups of faults intersect with each other and have different movement intensities,which make the crust of the study area bitty and the physiognomic feature various.The movement of EW-and NW-trending faults is strong in this area.Along the NW-trending faults between Wangwu-Wenjiao and Puqian-Qinglan faults,the crustal deformation is intense in the Neoid period.Analysis indicates that the EW-and NW-trending active faults are highly active since the Quaternary,which affect significantly the stability of crust of the northern Hainan Island.

Key words: RS data interpretation, active fault, multi-source information fusion