南黄海和东海地区现代构造应力场特征的研究
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摘要
分析研究了南黄海和东海地区18口石油勘探钻井的井孔崩落特征，结合对琉球岛弧和冲绳海槽地区浅源地震震源机制解的分析，确认了南黄海地区与我国华北地区有类似的现代构造应力场特征；并得出东海地区的最大水平压应力方向为NEE-SWW，最小水平压应力方向为NNW-SSE，它们分别与冲绳海槽地区的最大和最小主压应力方向接近;东海地区地壳上层的水平差应力可能不强，这与该地区没什么地震活动的特点是一致的．根据应力场特征推断，我国东部地区并未受到菲律宾海板块俯冲的推挤作用，而是可能受到垂直于冲绳海槽走向的拉伸作用的影响．
On the basis of borehole breakouts analysis of 18 oil wells in the sea basins and focal mechanism data of shallow earthquakes in the Okinawa trough and Ryukyu arc region, the present-day crustal tectonic stress in the southern Yellow Sea and East China Sea region is studied. On the new evidence mis paper establishes that the Yellow Sea region shows similar directions of principal stress axes as that in North China. The result of thes study indicates that for the East China Sea region the maximum principal compression is in the direction of NEE-SWW, while the minimum compression is in NNW-SSE, both roughly coinciding with the corresponding principal stress directions in the Okinawa trough. It is qinte possible that the differential horizontal stress is rather weak in the East China Sea region, where moderate and strong earth quakes have not been seen. From the characteristics of crustal stress we can infer that eastern China may be affected by the tension in a direction perpendicular tO the trending of the Okinawa trough, instead of suffering from the push of the PhiliPPine Sea plate.
On the basis of borehole breakouts analysis of 18 oil wells in the sea basins and focal mechanism data of shallow earthquakes in the Okinawa trough and Ryukyu arc region, the present-day crustal tectonic stress in the southern Yellow Sea and East China Sea region is studied. On the new evidence mis paper establishes that the Yellow Sea region shows similar directions of principal stress axes as that in North China. The result of thes study indicates that for the East China Sea region the maximum principal compression is in the direction of NEE-SWW, while the minimum compression is in NNW-SSE, both roughly coinciding with the corresponding principal stress directions in the Okinawa trough. It is qinte possible that the differential horizontal stress is rather weak in the East China Sea region, where moderate and strong earth quakes have not been seen. From the characteristics of crustal stress we can infer that eastern China may be affected by the tension in a direction perpendicular tO the trending of the Okinawa trough, instead of suffering from the push of the PhiliPPine Sea plate.
引文
[1] 汪素云、许忠淮、葛民,黄海、东海及邻区的地震构造应力场.中国地震, 3(3),18-25,1987.
[2] 高建理、丁健民、梁国平等,中国海区及其邻域的原地应力状态,地震学报,14(1), 17-28, 1992.
[3] 鄢家全、汪素云、贾素娟,震源机制分析.见:刘光鼎主编,中国海区及邻域地质地球物理特征,北京:科学出版社,194-202,1992.
[4] 吴崇筠、薛叔浩等著,中国含油气盆地沉积学,北京:石油工业出版社,237, 1992.
[5] 高阿甲、许忠淮、陈家庚,用钻孔崩落推断四川盆地的水平主应力方向,地震学报,12,140-147,1990.
[6] Zobacki M.D., Moos, D., Mastin, L, Well bore breakouts and in situ sbess. J Geopys. Aes., 90(B7),5523-5530. 1985.
[7] Haimson, B. C. C. G. Herric, Borehole breakouts-a new tool for estimating in situ stress? In: Proceedingsof M International Symposium on Rock stress Measurements, Stockholm, 1-3 Sept., 271-280,1986.
[8] 国家地震局地球物理研究所编制,中国及邻近地区地震震中分布图(公元前780-1984,M≥4.7),北京:中国地图出版社,1987.
[9] 许忠淮、汪素云、高阿甲等,我国部分早期震源机制解答的重新测定.地震地磁观测与研究,15(5),1-9, 1994.
[10] Aki, K,Richnds, P.G., Quantitative Seismology, Theory and Methods, Vol.1. San Ftuncisco: Freemanand Company, 1980.
[11] 许忠淮、汪素云、黄雨蕊等,由大量的地震资料推断的我国大陆构造应力场,地球物理学报,32,636-647,1989.
[12] 臧绍先、宁杰远、许立忠,琉球岛弧地区的地震分布、Benioff带形态及应力状态,地震学报,11,113-123,1989.
[13] Jaeger, J. C., Cook, G.W., Fundamentals of Rock Mechanics. London: Chapman and Hall,1976.
[14] Shiono K., Mikumo, T., Ishikawa Y., Tectonics of the Kyushu-Ryukyu arc as evidencde form seismicityand focal mechnism of shallow to inermidiati0-edpth earthquakes. J. Phys. Earth, 28(1),17-43,1980.
[15] 黄培华、苏维加、陈金波,冲绳海槽和琉球岛弧的地震活动与应力场,地震学报,16,407-415,1994。
[16] Jun Myung-Soon, Body-wave analysis for shallow intraplate earthquakes in the Korean Pennisula andYellow Sea. Tectonophysics, 192, 345-357, 1991.
[17] Dziewonski, A. M., Ekstrom, G., Salganik, M. P., Centroid-moment tensor solutions for July-Suptember,1995.Phys. Earth Planet Inter, 97(1-4), 3-14, 1996.
[2] 高建理、丁健民、梁国平等,中国海区及其邻域的原地应力状态,地震学报,14(1), 17-28, 1992.
[3] 鄢家全、汪素云、贾素娟,震源机制分析.见:刘光鼎主编,中国海区及邻域地质地球物理特征,北京:科学出版社,194-202,1992.
[4] 吴崇筠、薛叔浩等著,中国含油气盆地沉积学,北京:石油工业出版社,237, 1992.
[5] 高阿甲、许忠淮、陈家庚,用钻孔崩落推断四川盆地的水平主应力方向,地震学报,12,140-147,1990.
[6] Zobacki M.D., Moos, D., Mastin, L, Well bore breakouts and in situ sbess. J Geopys. Aes., 90(B7),5523-5530. 1985.
[7] Haimson, B. C. C. G. Herric, Borehole breakouts-a new tool for estimating in situ stress? In: Proceedingsof M International Symposium on Rock stress Measurements, Stockholm, 1-3 Sept., 271-280,1986.
[8] 国家地震局地球物理研究所编制,中国及邻近地区地震震中分布图(公元前780-1984,M≥4.7),北京:中国地图出版社,1987.
[9] 许忠淮、汪素云、高阿甲等,我国部分早期震源机制解答的重新测定.地震地磁观测与研究,15(5),1-9, 1994.
[10] Aki, K,Richnds, P.G., Quantitative Seismology, Theory and Methods, Vol.1. San Ftuncisco: Freemanand Company, 1980.
[11] 许忠淮、汪素云、黄雨蕊等,由大量的地震资料推断的我国大陆构造应力场,地球物理学报,32,636-647,1989.
[12] 臧绍先、宁杰远、许立忠,琉球岛弧地区的地震分布、Benioff带形态及应力状态,地震学报,11,113-123,1989.
[13] Jaeger, J. C., Cook, G.W., Fundamentals of Rock Mechanics. London: Chapman and Hall,1976.
[14] Shiono K., Mikumo, T., Ishikawa Y., Tectonics of the Kyushu-Ryukyu arc as evidencde form seismicityand focal mechnism of shallow to inermidiati0-edpth earthquakes. J. Phys. Earth, 28(1),17-43,1980.
[15] 黄培华、苏维加、陈金波,冲绳海槽和琉球岛弧的地震活动与应力场,地震学报,16,407-415,1994。
[16] Jun Myung-Soon, Body-wave analysis for shallow intraplate earthquakes in the Korean Pennisula andYellow Sea. Tectonophysics, 192, 345-357, 1991.
[17] Dziewonski, A. M., Ekstrom, G., Salganik, M. P., Centroid-moment tensor solutions for July-Suptember,1995.Phys. Earth Planet Inter, 97(1-4), 3-14, 1996.
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