唐山地震震源区构造应力场强度的初步分析
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摘要
利用唐山地区丰富的震源机制解资料反演构造应力场 ,并结合构造物理研究手段 ,对唐山地震震源区现代构造应力场的 3个主应力绝对量值进行了估算 ,给出了地壳介质参数取理论平均值的情况下 ,唐山地震震源区构造应力场 3个主应力量值随深度的变化趋势 .研究分析了摩擦系数μc、孔隙压力 P0 和应力形因子Φ等参数与应力值的关系 ,发现最大主应力σ1的垂向增长率与摩擦系数 μc成正比 ,与孔隙压力 P0 和应力形因子 Φ成反比 ;而最小应力值σ3 的垂向增长率与孔隙压力 P0 成正比 ,与摩擦系数μc和应力形因子Φ成反比 .本文对应用震源机制解资料反演完整的应力张量进行了一次有意义的尝试
Based on the abundant data of focal mechanism solution in Tangshan region, we playback its tectonic stress field; combined with tectonophysical method, we estimate the absolute values of three principal stresses in the source of Tangshan earthquake, as well as their vertical variations under the average values of crustal dielectric parameters. We also study the relations of ctustal stress with friction μ c, pore pressure P 0 and streess factor Φ , which are: the vertical growth rate of the maximal principal stress σ 1 is direct ratio fiction, and inverse ratio to pore pressure P 0 and to stress factor Φ; while the vertical growth rate of the minimal principal stress σ 3 is direct ratio to pore pressure P 0, inverse ratio to friction μ c and to stress factor Φ . This paper is a significant probe to play back the complete stress tensor using the data of focal mechanism solution.
Based on the abundant data of focal mechanism solution in Tangshan region, we playback its tectonic stress field; combined with tectonophysical method, we estimate the absolute values of three principal stresses in the source of Tangshan earthquake, as well as their vertical variations under the average values of crustal dielectric parameters. We also study the relations of ctustal stress with friction μ c, pore pressure P 0 and streess factor Φ , which are: the vertical growth rate of the maximal principal stress σ 1 is direct ratio fiction, and inverse ratio to pore pressure P 0 and to stress factor Φ; while the vertical growth rate of the minimal principal stress σ 3 is direct ratio to pore pressure P 0, inverse ratio to friction μ c and to stress factor Φ . This paper is a significant probe to play back the complete stress tensor using the data of focal mechanism solution.
引文
“中国地震简目”汇编组.1988.中国地震简目.155
崔效锋,谢富仁.1999.利用震源机制解对中国西南及邻区进行应力分区的初步研究[J].地震学报,21(5):513～522
崔效锋,谢富仁.2001.1976年唐山地震前后华北地区现代构造应力场的时空变化特征[J].中国地震,17(3):280～289
高建理,丁建民,梁国平,等.1987.华北地区盆地内地壳应力随深度的变化[J].中国地震,3(4):82～89
国家地震局分析预报中心.1980.中国东部地震目录.北京:地震出版社,156
马林,刘韬,梁尚鸿,等.1989.京津唐张地区小震震源机制解[J].地震,(6):69～73
王椿镛,张先康,吴庆举.1994.冀中坳陷内深地震反射剖面揭示的滑脱构造[J].科学通报,39:625～628
许忠淮.1985.用滑动方向拟合法反演唐山余震区的平均应力场[J].地震学报,7(4):349～361
谢富仁.1994.利用断层滑动资料确定构造应力主方向的方法[A].见:活动断裂研究编委会编.活动断裂研究(3)[C].北京:地震出版社,191～201
谢富仁,李宏.1995.利用断层滑动资料确定鲜水河断裂带构造应力方向和大小[J].地震学报,17(2):164～171
杨理华,李钦祖.1980.华北地区地壳应力场[M].北京:地震出版社,132
杨绪充.1985.济阳坳陷沙河街组区域构造应力及水动力特征探讨[J].石油勘探与开发,(12):13～20
张诚,曹新玲,曲克信,等.1990.中国地震震源机制[M].北京:学术书刊出版社,34～183
AngelierJ.1979.Determination of the mean principal direction of stresses for a given fault population[J].Tectonophysics,56:17～26
ByerleeJD.1978.Friction of rock[J].PureApplGeophys,116:615～626
HaimsonB C.1978.Hydrofracturing stressmeasuring method and recentfield results[J].IntJ RockMechSciGeomechAb-str,15:167～178
PlenefischT,BonjerK P.1997.Thestressfield in theRhineGraben area inferred from earthquakefocalmechanismsand es-timation of frictional parameters[J].Tectonophysics,275:71～97
ZobackM L.1992.Stressfield constraintson intraplate seismicity in eastern northAmerica[J].J GeophysRes,97:11761～11782
崔效锋,谢富仁.1999.利用震源机制解对中国西南及邻区进行应力分区的初步研究[J].地震学报,21(5):513～522
崔效锋,谢富仁.2001.1976年唐山地震前后华北地区现代构造应力场的时空变化特征[J].中国地震,17(3):280～289
高建理,丁建民,梁国平,等.1987.华北地区盆地内地壳应力随深度的变化[J].中国地震,3(4):82～89
国家地震局分析预报中心.1980.中国东部地震目录.北京:地震出版社,156
马林,刘韬,梁尚鸿,等.1989.京津唐张地区小震震源机制解[J].地震,(6):69～73
王椿镛,张先康,吴庆举.1994.冀中坳陷内深地震反射剖面揭示的滑脱构造[J].科学通报,39:625～628
许忠淮.1985.用滑动方向拟合法反演唐山余震区的平均应力场[J].地震学报,7(4):349～361
谢富仁.1994.利用断层滑动资料确定构造应力主方向的方法[A].见:活动断裂研究编委会编.活动断裂研究(3)[C].北京:地震出版社,191～201
谢富仁,李宏.1995.利用断层滑动资料确定鲜水河断裂带构造应力方向和大小[J].地震学报,17(2):164～171
杨理华,李钦祖.1980.华北地区地壳应力场[M].北京:地震出版社,132
杨绪充.1985.济阳坳陷沙河街组区域构造应力及水动力特征探讨[J].石油勘探与开发,(12):13～20
张诚,曹新玲,曲克信,等.1990.中国地震震源机制[M].北京:学术书刊出版社,34～183
AngelierJ.1979.Determination of the mean principal direction of stresses for a given fault population[J].Tectonophysics,56:17～26
ByerleeJD.1978.Friction of rock[J].PureApplGeophys,116:615～626
HaimsonB C.1978.Hydrofracturing stressmeasuring method and recentfield results[J].IntJ RockMechSciGeomechAb-str,15:167～178
PlenefischT,BonjerK P.1997.Thestressfield in theRhineGraben area inferred from earthquakefocalmechanismsand es-timation of frictional parameters[J].Tectonophysics,275:71～97
ZobackM L.1992.Stressfield constraintson intraplate seismicity in eastern northAmerica[J].J GeophysRes,97:11761～11782
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