14 17.,., Fig. 1 Bougeur gravity map of research region 2 Fig. 2 Magnetic map of research region

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1 1 7 1 Vol. 17 No (13 23) PROGRESS IN GEOPHYSICS March 2002 (,,100101) [ ],, 39.,,. [ ] ; ; [] P738 [] A [ ] (2002) ,,.,,, NE [1 ],.., ( NE, EW,NE ),.,.,, km ( km), ( 1)., km, ( 2).,,,, [ ] ; [ ] [ ] ( G ) ( KZCX ). [ ],,1957, ( c2geos. ac. cn)

2 14 17.,., Fig. 1 Bougeur gravity map of research region 2 Fig. 2 Magnetic map of research region

3 1 : 15, [2 ].,,., [3 14 ],, Fig. 3 Result of horizontal direction derivative (135 ) of gravity data , 6.,,,, 39 ( 7). :NE.,NE NNE 46 %, ,.. [7 ]. [15 ].,.,,,,. -., ,1998.,,,.., 1995.,,,..,1998.,,,..,1994.,,,..,2001.

4 16 17, NW...,, NE, SN NNW. 0., Fig. 4 Result of horizontal direction derivative (135 ) of magnetic data 5 Fig. 5 Gravity vertical gradient result map

5 1 : 17 6 Fig. 6 Bistribution of Moho depth in research region 7 Fig. 7 Distribution of main faults in research region.,.,, NW. 15 N..,, NE NW,..

6 18 17,,, NE, EW,NE,,,,.,...,,.,.,.. 1 Table 1 Geophysical field feature of main faults in research region 1. NE2NEE. 500 km...,. 2. NE2NNE.,,...,.. 5. NNE.. NE.,,., NE.,. 5 km, km....,,,ne,,sn 8. NW NNW. km, km...,.,..,., 35,,. NW. 15 N..,.,,..,2001.

7 1 : mgal. 10., NE.., , NE,,., mgal.,..,, ;, NE [5 ]. 2,, mgal.,., [16 ]. 13., NE. 30, 130, , NE NE, EW, NE,,. km.,..,.,,..., mgal. NE. 15..,,. EW NEE km,, NNE.,. NE NEE, ,.,.,.,,,. 3,.

8 NW. NW,. 22., SN...,,. NE.. NNE2 SN,. 25. NW.,, NW,. 135,. NE,, SW,, ;. 26. NE. 135, NE.. NW2, NE NWW EW km., NW ,, NE NW,., SN.,,, SN.. NE , NE..,

9 1 : 21,., [5,16 ].,.,, [17 ] ; [1 ]. [18 ]. [1 ],. :, mgal.,..,, ;, NE [5 ].,, mgal ( 8).,., [16 ]. 3 8 Fig. 8 Jiangshao fault belt in Tunxi2wenzhou gravity profile 3. 1 NE2NNE.,,. 3. 2,.

10 22 17.,,., 15 N,.,. 3. 3,., 200 km,., ( )... :, 2,,! [1 ]. [M]. :,1993. [2 ],,,. [12 ] Dennis E. Hayes, Susan Spangler Nissen, Peter Buhl, et [J ].,2001,44 (4) : [3 ],. [ A]. : : 2 [M]. : [13 ] Susan Spangler Nissen, Dennis E Hayes, Yao Bochu, et,1989. [4 ],. [J ] ,21 (1),1 6. [5 ],,. [14 ] Susan Spangler Nissen, Dennis E. Hayes, Peter Buhl, et [J ].,1996,39 (4) : [6 ]. [J ]. 2001,2001,193. [7 ],. [J ]., 1996,42 (5) : [8 ],. [J ].,1991,11 (4) :1 6. [9 ],,,. [J ].,1994,37 (1) : [ 10 ] Allen T Chen, Yosio Nakamura. Velocity structure beneath the eastern offshore region of southern Taiwan based on OBS data[j ]. TAO. 1998,9 (3) : [11 ],,. [J ] , 21 (1) : al., Throughgoing crustal faults along the northern margin of the South China Sea and their role in crustal extension [J ]. Journal of geophysical research, 1995, 100 (B11), al. Gravity, heat flow, and seismic constraints on the pro2 cesses of crustal extension : Northern margin of the South China Sea. Journal of geophysical research. 1995, 100 (B11) : al. Deep penetration seismic soundings across the northern margin of the South China Sea. Journal of geophysical re2 search, 1995,100 (B11), [15 ],. [J ] ,196. [16 ],,,. 2 [ A ]. :: [ C]. :,1993. [17 ],. [M]. :,1986. [18 ],,,. [J ] ,29 :43 55.

11 1 : 23 Geophysical Evidences of Some Important Faults in South China and Adjacent Marginal Seas Region HAO Tian2yao LIU Jian2hua SONG Hai2bin XU Yi ( Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing,100101, China) [ Abstract] South China and adjacent marginal seas region is located in the area where Euro2Asia Plate, Philippine Plate and India Plate meet together. It s an important window to research the forma2 tion and evolution about Chinese Continent and marginal seas. In this paper, 39 main faults with dif2 ferent directions in research area are distinguished after processing ( horizontal direction derivative, wavelet transform and inversion for special sections) and analysis for gravity and magnetic data of re2 search area. The feature, extension direction of some faults (for example : Red River Fault) and rela2 tionship between faults and adjacent geological blocks are discussed according to geophysical anomaly features. [ Keywords] South China and Adjacent Marginal Seas ; Faults ; Geophysical evidence 21 ( ) CNPC ( ) ( ) 9 20, ( ) :21, 20, 21,,,,,,,, 21, 21 21, 20, 21,, ( )

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