ZENG BONGSHENG, ZHANG SHAOQUAN, ZHOU HAINAN, HE ZHENGQINmult. 1985: CRUSTAL STRUCTURE OF TANGSHAN EPICENTRAL REGION AND ITS RELATION TO THE SEISMOGENIC PROCESS OF A CONTINENTAL EARTHQUAKE. Acta Seismologica Sinica, 7(2): 125-142.
Citation: ZENG BONGSHENG, ZHANG SHAOQUAN, ZHOU HAINAN, HE ZHENGQINmult. 1985: CRUSTAL STRUCTURE OF TANGSHAN EPICENTRAL REGION AND ITS RELATION TO THE SEISMOGENIC PROCESS OF A CONTINENTAL EARTHQUAKE. Acta Seismologica Sinica, 7(2): 125-142.

CRUSTAL STRUCTURE OF TANGSHAN EPICENTRAL REGION AND ITS RELATION TO THE SEISMOGENIC PROCESS OF A CONTINENTAL EARTHQUAKE

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  • Published Date: August 31, 2011
  • In the present paper, the authors discuss the different phases in DSS profile records obtained from Tangshan, and the methods of their interpretations. The DSS data of some profiles running through the Tangshan epicentral region show that the crustal structure in this region is characterized by some special features, which may bear some significant relations to the cause of the occurence of a great earthquake in continintal region.In this area, the earths crust are of three different types, each of which exhibits some peculiar features in velocity structure. An abrupt change of depth of Moho and hence a certain type of faulting usually occurs at or near the boundary between two areas of different types of crust. The difference between different crustal structures may be largely due to the difference in degree of vertical migration of-materials from the uppermost mantle into the crust. The crustal strusture of the epicentral region exhibits the highest degree of material migration from the uppermost mantle in to the lower crust. However, the present crustal structure is a collective fossil inherited from a long span of geological time. Therefore, it is still not very clear whether the migration processes which seem to have been very prominent in the past, are still working effectively at the present. A comparison has been made of the boundaries between different types of crustal structure with the geological map in which the Tertiary surface layer has been stripped off. If is striking that the boundary between different crustal structures is in coincidence with a certain ancient geological map. It is possible that in such an area as Beijing-Tianjing-Tangshan, which is not very far from the coast, different kinds of small ancient geological bodies have been brought together and cemented by ancient global tectonic processes. The main shock of Tangshan earthquake of 1976 occured in the crustal structure of type Ⅱ and near the boundary of the crustal structure of type Ⅱ and type Ⅲ. Therefore, either the occurence of Tang-shan earthquake is due to vertical migration of material from the uppermost mantle into the crust, or it is caused by the reactivation of the weak zone while the whole region is at present under the action of a certain tectonic force. However, it is quite certain that in the area with crustal structure of type Ⅱ, the middle crustal layer has negligible thickness or is totally absent. Since the upper part of the crust may be brittle, it will easily collapse under the action of present tectonic stress.
  • [1] 国家地震局,1976年唐山地震,地震出版社,1982,

    [2] Brekovskikh, L., Waves in Layered Media, Academic Press, New York, 1980.

    [3] Cerveny, V. et al., Refraction of elastic waves mto.medium of low velocity——pseudospherical waves. Peere Appl. Geophys. 92, 115——132, 1971.

    [4] Cervenj", V., and J. Kozak, Experimental evidence and investigation of pseudospherical waves. J Geophys. 38, 617——628, 1972.

    [5] Fuchs, K. and K. Schulz, Tunnelling of low——frequency waves through the subcrustal lithosphere J. GeopEtys. 42, 175——190, 1976.

    [6] 曾融生等,岩石圈下部的速度结构,地球物理学报27,31——41 1976,

    [7] Meissner, R., Exploring deep interface by seismic wide angle measurements. Geophysical Prospe——trnR, 15, 598——616, 1967.

    [8] Prodehl, C., Crustal structure of the western United States, Geological Survey Professional Papet1034, 1979.

    [9] Molnar, P. and P. Taponnier, Cenozoic tectonics of Asia: Effects of a continental collision, Science,189, 419——420, 1975.

    [10] 族顺民等,唐山地震区域构造背景和发震模式的讨论,地质科学,4, 305——321,1977.

    [11] Richardson, R. H. et al., Intraplate stress as an indication of plate tectonic driving forces. J.Geophys. Res. 81, 1947——1956, 1976.

    [12] 曾融生,固体地球物理学导论,第十二章,科学出版社,1941.

    [13] Sykes, L. R., Intraplate seismicity, reactivation of preexisting zones of weakness, alkaline magmatism, and other tectonics postdating continental fragmentation, Rev. Geophys. and poce Phys. 16, 621——688, 1978.

    [14] 张少泉,俞玉琪,高世玉,周海南,横向非均匀介质的射线追踪方法及其应用,地震地磁观测与研究,4,6,1——3,1953

    [1] 国家地震局,1976年唐山地震,地震出版社,1982,

    [2] Brekovskikh, L., Waves in Layered Media, Academic Press, New York, 1980.

    [3] Cerveny, V. et al., Refraction of elastic waves mto.medium of low velocity——pseudospherical waves. Peere Appl. Geophys. 92, 115——132, 1971.

    [4] Cervenj", V., and J. Kozak, Experimental evidence and investigation of pseudospherical waves. J Geophys. 38, 617——628, 1972.

    [5] Fuchs, K. and K. Schulz, Tunnelling of low——frequency waves through the subcrustal lithosphere J. GeopEtys. 42, 175——190, 1976.

    [6] 曾融生等,岩石圈下部的速度结构,地球物理学报27,31——41 1976,

    [7] Meissner, R., Exploring deep interface by seismic wide angle measurements. Geophysical Prospe——trnR, 15, 598——616, 1967.

    [8] Prodehl, C., Crustal structure of the western United States, Geological Survey Professional Papet1034, 1979.

    [9] Molnar, P. and P. Taponnier, Cenozoic tectonics of Asia: Effects of a continental collision, Science,189, 419——420, 1975.

    [10] 族顺民等,唐山地震区域构造背景和发震模式的讨论,地质科学,4, 305——321,1977.

    [11] Richardson, R. H. et al., Intraplate stress as an indication of plate tectonic driving forces. J.Geophys. Res. 81, 1947——1956, 1976.

    [12] 曾融生,固体地球物理学导论,第十二章,科学出版社,1941.

    [13] Sykes, L. R., Intraplate seismicity, reactivation of preexisting zones of weakness, alkaline magmatism, and other tectonics postdating continental fragmentation, Rev. Geophys. and poce Phys. 16, 621——688, 1978.

    [14] 张少泉,俞玉琪,高世玉,周海南,横向非均匀介质的射线追踪方法及其应用,地震地磁观测与研究,4,6,1——3,1953
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