汶川M_S8.0地震前地表潜热通量异常
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摘要
本文处理了汶川MS8.0大地震前后部分地表潜热通量(SLHF)数据,发现SLHF异常信息出现在地震前7天。SLHF异常时间上经历弱—强—弱变化过程,地震发生在强异常时段,异常两个高值点出现在活动断层较为发育的应力低值区,地震发生后,异常信息很快衰减。SLHF异常随时间有沿发震断裂带走向运移的规律。震前7天的综合SLHF异常主要分布在龙门山断裂带及周围地区,震中位于异常区的中心位置。
In this paper,surface latent heat flux(SLHF)data is processed and analyzed before the Wenchuan MS8.0 earthquake.According to the results,SLHF abnormity appears in local area 7 days before the earthquake.The abnormity information shows weak initially and then becomes strong gradually and becomes weak eventually.SLHF abnormity is very strong when the main earthquake takes place.There are two high SLHF value points which appear in relative low stress area with developed active faults.SLHF abnormity becomes weak quickly after the main shock.SLHF abnormity area migrates with time along main focus faults.7 days' synthetic SLHF abnormity area covers around Longmenshan Faults and the epicenter of the main shock locates in the center of the abnormity area.
In this paper,surface latent heat flux(SLHF)data is processed and analyzed before the Wenchuan MS8.0 earthquake.According to the results,SLHF abnormity appears in local area 7 days before the earthquake.The abnormity information shows weak initially and then becomes strong gradually and becomes weak eventually.SLHF abnormity is very strong when the main earthquake takes place.There are two high SLHF value points which appear in relative low stress area with developed active faults.SLHF abnormity becomes weak quickly after the main shock.SLHF abnormity area migrates with time along main focus faults.7 days' synthetic SLHF abnormity area covers around Longmenshan Faults and the epicenter of the main shock locates in the center of the abnormity area.
引文
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[13]牛安福,张凌空,闫伟,等.汶川地震前南北地震带中北段地形变变化特征的研究[J].地震,2009,29(1):100-107.
[14]高孟潭,陈学良,俞言祥,等.“5.12”汶川8.0级地震汉源烈度异常机理的初步探讨[J].震灾防御技术,2008,3(3):216-223.
[15]唐文清,陈智梁,刘宇平,等.青藏高原东缘鲜水河断裂与龙门山断裂交会区现今的构造活动[J].地质通报,2005,24(12):1169-1172.
[16]江在森,方颖,武艳强,等.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,2009.52(2):505-518.
[17]Singh P,Dey S,Bhoi S,et al.Anomalous increase of chlorophyll concentrations associated with earthquakes[J].Advances in Space Research,2006,(37):671-680.
[2]Dey S,Singh R.Surface Latent Heat Flux as an earthquake precursor[J].Natural Hazards and Earth System Science,2003,(3):749-755.
[3]Cervone G,Panait L,Singh R,et al.An Application of Evolutionary Algorithmto Predict the Ex-tent of SLHF Anomaly Associated with Coastal Earthquakes[J].Proceedings of GECCO-2004,Ge-netic and Evolutionary Computation Conference,Seattle,WA,June26-30,2004.
[4]Cervone G,Gautam R,Singh R,et al.Association of Surface Latent Heat Flux with Hurricane Isa-bel[J].COSPAR-2004,Committee on Space Research,Paris,France,July18-25,2004.
[5]Singh P,Cervone G,Singh P V,et al.Generic precursors to coastal earthquakes:Inferences from Denali fault earthquake[J].Tectonophysics,2007,(431):231-240.
[6]陈梅花,邓志辉,杨竹转,等.2004年印度尼西亚9级大地震前的潜热通量异常[J].科学通报,2006,51(1):118-120.
[7]中国地震局.2008年汶川8.0级地震科学总结与反思报告[C].2009.125-130.
[8]汶川8.0级地震前后原地应力重复测量研究成果[C].http://www.cea.gov.cn/.
[9]Bina C R.A note on latent heat release from disequilibrium phase transformations and deep seis-mogenesis[J].Earth Planets Space,1998,(50):1029-1034.
[10]Tronin A A,Hayakawa M,Molchanov O A.Thermal IRsatellite data for earthquake researchin Ja-pan and China[J].J Geodyn,2002,(33):519-534.
[11]丁鉴海,卢振业,黄雪香.地震地磁学[M].北京:地震出版社,1994,p262.
[12]戴华光,陈永明,苏向洲,等.天桥沟—黄羊川活动断裂带的几何学和运动学特征[J].西北地震学报,1999,21(3):259-267.
[13]牛安福,张凌空,闫伟,等.汶川地震前南北地震带中北段地形变变化特征的研究[J].地震,2009,29(1):100-107.
[14]高孟潭,陈学良,俞言祥,等.“5.12”汶川8.0级地震汉源烈度异常机理的初步探讨[J].震灾防御技术,2008,3(3):216-223.
[15]唐文清,陈智梁,刘宇平,等.青藏高原东缘鲜水河断裂与龙门山断裂交会区现今的构造活动[J].地质通报,2005,24(12):1169-1172.
[16]江在森,方颖,武艳强,等.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,2009.52(2):505-518.
[17]Singh P,Dey S,Bhoi S,et al.Anomalous increase of chlorophyll concentrations associated with earthquakes[J].Advances in Space Research,2006,(37):671-680.
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