唐山(1976)和三河--平谷地震(1679)附近的地应力场特征
ON STRESS FIELD IN EPICENTRAL AREAS OF 1976 TANGSHAN EARTHQUAKE AND 1679 SANHE-PINGGU EARTHQUAKE
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摘要: 本文讨论了唐山(1976)和三河-平谷地震(1679)附近的地应力场特征,发现位于震中附近的测点,其应力值比较低,而离开震中以远的测点则应力值比较高.同时还讨论了在唐山市凤凰山和顺义吴雄寺(三河-平谷地震附近)连续几年的测量结果,表明这两个地区震中附近的主应力值随时间变化的幅度不大,而它们的主应力方向随时间则有明显地变化.最后分析了引起震中附近低值应力的原因,并指出研究低值应力异常对地震预报的意义.Abstract: This paper discusses the characteristics of the stress field in the epicentral areasof two large earthquakes -- Tangshan of 1976 and Sanhe-Pinggu of 1679. Stressmeasurements in drill holes give lower values for the points close to the epicentral areas while higher values at points away from them. Meanwhile, a series of stress measurements at two points, Fenghuangshan in Tangshan City and Wuxiongsi of the Shunyi County, nearby the Sanhe-Pinggu epicenter in a period of several years show that the values of principal stress do not vary appreciably with time but their directions are changed obviously. Finally, a preliminary analysis on the cause of low stress values in the epicentral areas has been made and the significance relating to prediction of earthquakes mentioned.
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[3] D. Denham, L. G. Alcaader and G. Worotnicki, The stress field near the sites the Meckering(1968)and Oalin giri (1970) earthquakes, Western Australia, TecfonoPhysics, 67, 283——317, 1980.
[4] 梁国平、丁健民,郊城一庐江断裂带附近的地壳应力场特征,地壳形变与地震,4, 1982,
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[9] 李方全、孙世宗、李立球,华北及郊庐断裂带地应力测量,岩石力学与工程学报,1, 1982,
[10] B. Raleigh and J. Evernden, The ease for low deviatoric stress in lithosphere,岩石圈中低偏应力的论证,国外地震,6, 38——51, 1980,[1] M. D. Zoback and J. G. Roller, Magnitude of shear stress on the San Andreas Fault:Implica——tions of a stress moasurement profile at shallow depth. Scie},oe, 20G, 4417, 445——447, 1979.
[2] M. D. Zoback, H. Tsukahara and S. I3ickman, Stress measurements at depth in the vicinity of the San Andreas Fault:Implications for the magnitude of shear stress at depth, J. Geophys.Res.85,B11. 6157——6173. 1980.
[3] D. Denham, L. G. Alcaader and G. Worotnicki, The stress field near the sites the Meckering(1968)and Oalin giri (1970) earthquakes, Western Australia, TecfonoPhysics, 67, 283——317, 1980.
[4] 梁国平、丁健民,郊城一庐江断裂带附近的地壳应力场特征,地壳形变与地震,4, 1982,
[5] 刘霆、丁健民,八宝山断裂带附近的地应力场特征,地震科学研究,4, 8——11, 1982,
[6] 李方全、王连捷,华北地区地应力测量,地球物理学报,22, 1, 1——8, 1979,
[7] 王连捷、范雪玲、廖椿庭,平面地应力测量结果的最小二乘方整理方法,地应力测量的理论和应用,地质出版社,1981.
[8] 丁旭初,震后应力状态,地震战线,6, 27——30, 1980,
[9] 李方全、孙世宗、李立球,华北及郊庐断裂带地应力测量,岩石力学与工程学报,1, 1982,
[10] B. Raleigh and J. Evernden, The ease for low deviatoric stress in lithosphere,岩石圈中低偏应力的论证,国外地震,6, 38——51, 1980,
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