西藏高原及其周围地区地震的地震矩张量及震源参数的尺度关系.
-
摘要: 本研究根据 WWSSN 的长周期远震体波记录,采用广义反演技术确定了1966至1980年期间发生在西藏高原及其周围地区的11个主要浅源地震的地震矩张量,同时得到了震源时间函数和震源深度.部分地震的地震矩张量解明显地偏离双力偶模型,偏离的程度似乎与震源机制参数有关.所分析的地震具有较浅的震源深度,均分布在上部地壳范围内.由最佳双力偶模型所得到的震源机制解与印度洋板块向东北方向移动与欧亚板块相碰撞,以及西藏高原向东移动的假设相一致.尺度关系分析表明,板内地震的应力降系统地高于缝合线附近地震的应力降.地震过程持续时间随着地震的规模而增长,但对于相同规模的地震,缝合线附近地震的持续时间长于板内地震.以上结果反映了大陆内部地震的地震矩张量的特征,并暗示缝合线附近地震具有与板内地震不同的发震环境和震源过程.
-
-
[1] 陈运泰、林邦慧、林中徉、李志勇，1975.根据地面形变的观测研究1966年邢台地震的震源过程.地球物理学报，18, 3. 164——182.
[2] 环文林、时振梁、鄢家全、汪素云，1979.中国及邻区现代构造形变特征.地震学报，1. 109——120.
[3] 叶洪、梁以山、沈丽琪、向宏发，1975.喜马拉雅弧形山系及其邻近地区现代构造应力分析.地质科学，1, 32——48.
[4] Chandra, U.，1978. Seismicity, earthquake mechanisms and tectonics along the Himalayan mountain range and vi——cinity. Phys. Earth Planet. Inter.，16. 109——131.
[5] Dewey, J. F. and Burke, K. C. A.，1973. Tibetan, Variscan and continental collisional orogeny. J. Geol.，81, 683——692.
[6] Dziewonski, A. M. and Woodhouse, J. H.，1983. An experiment in systematic study of global seismicity:Centroid——moment tensor solutions for 201 moderate and large earthquakes of 1981. J. Geophv"s. Re.s.，88, 3247——3271.
[7] Fitch, T. J.，1970. Earthquake mechanisms in the Himalayan, Burmese, and Andaman regions and continental tectonics in central Asia. J. Genphys. Res. ,75, 2699——2709
[8] Helmberger, D. V . and Johnson. L. R. , 1977·Source parameters of moderate size earthquakes and the importance of receiver crustal structure in interpreting observations of local earthquakes. Bull. Seismol. Snc. Amer.，67. 301——313.
[9] Kanamori, H. and Anderson, D. L.，1975. Theretical basis of some empirical relations in seismology. Bull. Seisnwl. Soc. Armr.，65, 1073——1095
[10] Kanamori, H. and Given, J. W.，1982. Use of long——period surface waves for rapid determination of earthquake source parameters 2, Preliminary determination of source mechanism of large earthquakes (Ms≥6.5)in 1980.Phys. Earth Planet. Inter.， 30, 260——268.
[11] Molnar, P. and Tapponnier, P., 1978. Active tectonics of Tibet. J. Geophys. Res. , 83. 5361., 5375.
[12] Molnar, P.，Fitch, T. and Wu, F. T.，1973. Fault plane solutions of shallow earthquakes and contemporary tectonics in Asia. Earth Planet. Sci. Lett.，19, 101——112.
[13] Ni, J. and York, J. E., 1978. Late Cenozoic tectonics of the Tibetan plateau. ,J. Geophy.c. Res. .83, 5377——5384.
[14] Whitten, C. A.，1957. The Dixie Valley——Fairview Peak, Nevada, earthquakes of December 16, 1954: Geodetic measurements in the Dixie Valley area. Bull. Seismol. Soc. Amer. .47, 321——325.
[15] Wiggins, R. A.，1972. The general linear inverse problem: implication of surface wave and &ee oscillations for earth structure. Rev .Geophys. Space Phys.，10, 251——285.
[16] Zheng, S. H.，1983. Seismic moment tensor inversion of earthquakes in and near the Tibetan Plateau and their tectonic implications. Ph. D. Thesis of Tohoku University, 1——187. Japan.[1] 陈运泰、林邦慧、林中徉、李志勇，1975.根据地面形变的观测研究1966年邢台地震的震源过程.地球物理学报，18, 3. 164——182.
[2] 环文林、时振梁、鄢家全、汪素云，1979.中国及邻区现代构造形变特征.地震学报，1. 109——120.
[3] 叶洪、梁以山、沈丽琪、向宏发，1975.喜马拉雅弧形山系及其邻近地区现代构造应力分析.地质科学，1, 32——48.
[4] Chandra, U.，1978. Seismicity, earthquake mechanisms and tectonics along the Himalayan mountain range and vi——cinity. Phys. Earth Planet. Inter.，16. 109——131.
[5] Dewey, J. F. and Burke, K. C. A.，1973. Tibetan, Variscan and continental collisional orogeny. J. Geol.，81, 683——692.
[6] Dziewonski, A. M. and Woodhouse, J. H.，1983. An experiment in systematic study of global seismicity:Centroid——moment tensor solutions for 201 moderate and large earthquakes of 1981. J. Geophv"s. Re.s.，88, 3247——3271.
[7] Fitch, T. J.，1970. Earthquake mechanisms in the Himalayan, Burmese, and Andaman regions and continental tectonics in central Asia. J. Genphys. Res. ,75, 2699——2709
[8] Helmberger, D. V . and Johnson. L. R. , 1977·Source parameters of moderate size earthquakes and the importance of receiver crustal structure in interpreting observations of local earthquakes. Bull. Seismol. Snc. Amer.，67. 301——313.
[9] Kanamori, H. and Anderson, D. L.，1975. Theretical basis of some empirical relations in seismology. Bull. Seisnwl. Soc. Armr.，65, 1073——1095
[10] Kanamori, H. and Given, J. W.，1982. Use of long——period surface waves for rapid determination of earthquake source parameters 2, Preliminary determination of source mechanism of large earthquakes (Ms≥6.5)in 1980.Phys. Earth Planet. Inter.， 30, 260——268.
[11] Molnar, P. and Tapponnier, P., 1978. Active tectonics of Tibet. J. Geophys. Res. , 83. 5361., 5375.
[12] Molnar, P.，Fitch, T. and Wu, F. T.，1973. Fault plane solutions of shallow earthquakes and contemporary tectonics in Asia. Earth Planet. Sci. Lett.，19, 101——112.
[13] Ni, J. and York, J. E., 1978. Late Cenozoic tectonics of the Tibetan plateau. ,J. Geophy.c. Res. .83, 5377——5384.
[14] Whitten, C. A.，1957. The Dixie Valley——Fairview Peak, Nevada, earthquakes of December 16, 1954: Geodetic measurements in the Dixie Valley area. Bull. Seismol. Soc. Amer. .47, 321——325.
[15] Wiggins, R. A.，1972. The general linear inverse problem: implication of surface wave and &ee oscillations for earth structure. Rev .Geophys. Space Phys.，10, 251——285.
[16] Zheng, S. H.，1983. Seismic moment tensor inversion of earthquakes in and near the Tibetan Plateau and their tectonic implications. Ph. D. Thesis of Tohoku University, 1——187. Japan.
计量
- 文章访问数: 1213
- HTML全文浏览量: 16
- PDF下载量: 41
下载:
