利用重复重力观测资料研究地震活动与地壳的损伤演化过程
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摘要
利用细观损伤力学模型建立了地壳损伤演化过程与地球重力场变化的关系 ,讨论了利用重力观测资料计算地壳微裂纹密度参数变化分布的理论与计算方法。利用河西地区 1992～ 1999年多期重复重力观测资料对该地区的裂纹密度参数变化进行了计算 ,并将计算结果与该地区的各观测时间段内相应发生的一级以上地震活动进行了对比分析 ,取得了一些有意义的结论和认识。
The relationship between the evolution process and gravity rate is deduced by using micro damage mechanics model in this paper. The theory and method to compute the distribution of the density parameters of the micro crack in the earth crust by using gravity observations are discussed. At last, the variation of the density parameter in Hexi region is computed by using repeated gravity observation data in 1992 and 1999,and the computing result is compared with M s> 1.0 earthquake activities occurred in each observation span, and some significant conclusions and recognitions are obtained.\;
The relationship between the evolution process and gravity rate is deduced by using micro damage mechanics model in this paper. The theory and method to compute the distribution of the density parameters of the micro crack in the earth crust by using gravity observations are discussed. At last, the variation of the density parameter in Hexi region is computed by using repeated gravity observation data in 1992 and 1999,and the computing result is compared with M s> 1.0 earthquake activities occurred in each observation span, and some significant conclusions and recognitions are obtained.\;
引文
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3 KanamoriH .Thenatureofseismicitypatternbeforelargeearthquakes,earthquakeprediction-aninternationalreview(eds.simpsonDWandRichardsPG).MauriceEwingSeries(AGU4),1981,1～9.
4 NurA .Dilatancy,porefluidsandpremonitoryvariationsints/tpttraveltimes.Bull,Seismol.Soc.Am.,1972.62,1217～1222.
5 MjachkinV ,BraceW ,SobolevG .Twomodelsofearthquakeforerunners.PAGEOPH .,1975,113:169～181.
6 RiceJR .Thetheoryofprecursoryprocessintheinceptionofearthquakerupture.GerlandsBeitr.Geophysik,1979(b),88:91～127.
7 BudianskyBandO’ConnellRJ.Elasticmoduliofacracksolids.Int.J .Solids,1976,12(1):81～95.
8 余寿文,冯西桥著.损伤力学.北京:清华大学出版社,1997,327.
9 张永志,王文萍,梁伟锋,等.地壳损伤状态的重力频域反演研究.地震学报,1998,20(3):322～326.
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