昆仑8.1级地震前青藏块体东北缘构造运动特征
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摘要
利用青藏块体东北缘 1993、1999和 2 0 0 1年的GPS观测资料和 1980年以来的跨断层流动形变资料 ,分析了昆仑 8.1级地震前青藏块体东北缘地区水平运动演变与断层异常活动的一些特征。结果显示 :震前水平运动与变形强度减弱 ,断层形变异常发育。结合块体和构造研究认为 ,青藏块体内部 8.1级大震的蕴育和发生 ,对块体边界构造区域影响显著 ;震后调整和应力转移可能加速块体东北部某些构造部位应变能的积累。
By analying observational data of crustal deformation which include results observed by GPS in 1993,1999 and 2001, together with results of mobile deformation measurment crossing main faults since 1980, the features of regional horizontal movement and deformation evolution and abnormal fault activity in northeast margin of Qinghai Tibet block before the Kunlun \%M\%s8.1 earthquake are preliminarily studied. The results show that the regional horizontal movement and deformation intensity decreased before the earthquake, and anomalies of fault deformation developed. In addition, combined with the investigation on block and structure,the analysis indicates that the occurrence and development of this \%M\%s8.1 earthquake inside Qinghai Tibet block has obviously affected the tectonic region of block boundary, and after the Kunlun \%M\%s8.1 earthquake, the adjustment and shift of tectonic stress have probably promoted accelerating and accumulation of strain of some tectonic positions in this area.
By analying observational data of crustal deformation which include results observed by GPS in 1993,1999 and 2001, together with results of mobile deformation measurment crossing main faults since 1980, the features of regional horizontal movement and deformation evolution and abnormal fault activity in northeast margin of Qinghai Tibet block before the Kunlun \%M\%s8.1 earthquake are preliminarily studied. The results show that the regional horizontal movement and deformation intensity decreased before the earthquake, and anomalies of fault deformation developed. In addition, combined with the investigation on block and structure,the analysis indicates that the occurrence and development of this \%M\%s8.1 earthquake inside Qinghai Tibet block has obviously affected the tectonic region of block boundary, and after the Kunlun \%M\%s8.1 earthquake, the adjustment and shift of tectonic stress have probably promoted accelerating and accumulation of strain of some tectonic positions in this area.
引文
1 王双绪,江在森,张希,等.甘宁青地区现今构造形变异常与地震[J].大地测量与地球动力学,2002,24(4):44～48
1 WangShuangxu,ZhangXi,ZhangSixin,etal.Recenttec tonicdeformationanomalyandearthquakesinGansuNingxi aQinghaiarea[J].JournalofGeodesyandGeodynamics,2002,22(4):44-48.(inChinese)
2 乔学军,王琪,杜瑞林,等.昆仑山口西Ms8.1地震的地壳变形特征[J].大地测量与地球动力学,2002,22(4):6～11.
2 QiaoXuejun,WangQi,DuRuilin,etal.CharacteristicsofcrustaldeformationrelatingtoMs8.1kunlunshanearth quake[J].JournalofGeodesyandGeodynamics,2002,22(4):6-11.(inChinese)
3 王庆良,王文萍,崔笃信,等.青藏块体东北缘现今地壳运动[J].大地测量与地球动力学,2002,22(4):12～16.
3 WangQingliang,WangWenping,CuiDuxin,etal.Present daycrustalmovementofnortheasternmarginofQinghaiTi betblock[J].JournalofGeodesyandGeodynamics,2002,22(4):12-16.(inChinese)
4 张晓亮,江在森,陈兵,等.对青藏东北缘现今块体划分、运动及变形的初步研究[J].大地测量与地球动力学,2002,22(1):63～67.
4 ZhangXiaoliang,JiangZaisen,ChenBing,etal.Preliminaryresearchonpresentblockdemarcation,movementanddefor mationinnortheastmarginofQinghaiTibet[J].JournalofGeodesyandGeodynamics,2002,22(1):63-67.(inChi nese)
5 陈兵,江在森,马文静,等.青藏块体东北缘断层形变与中强地震[J].大地测量与地球动力学,2002,22(4):49～55.
5 ChenBing,JiangZaisen,MaWenjing,etal.Faultdeforma tionandmoderate strongearthquakesinnortheasternmarginofQinghaiTibetblock[J].JournalofGeodesyandGeody namics,2002,22(4):49-55.(inChinese)
6 薄万举,张祖胜,郭良迁,等.昆仑山口大地震与地形变异常的讨论[J].大地测量与地球动力学,2003,23(1)22～28.
6 BoWanju,ZhangZusheng,GuoLiangqian.DiscussionofKunlunmountainlargeearthquakeandrelatedanomaliesofcrustaldeformation[J].JournalofGeodesyandGeodynam ics,2003,23(1)22-28.(inChinese)
7 江在森,张希,崔笃信,等.青藏块体东北缘近期水平运动与变形[J].地球物理学报,2001,44(5):636～644.
7 JiangZaisen,ZhangXi,CuiDuxin,etal.Reccenthorizon talmovementanddeformationinthenortheastmarginofQinghaiXizangblock[J].ActaGeophysicaSinica,2001,44(5):636-644.(inChinese)
8 江在森,张希,陈兵,等.华北地区近期地壳水平运动与应力应变场特征[J].地球物理学报,2000,43(5):657～665
8 JiangZaisen,ZhangXi,ChenBing,etal.Thecharacteris ticsofreccentcrustalhorizontalmovementandstrainstressfieldinNorthChina[J].ActaGeophysicaSinica,2000,43(5):657-665.(inChinese)
9 江在森,马宗晋,张希,等.青藏块体东北缘水平应变场与构造变形分析[J].地震地质,2001,23(3):337～345
9 JiangZaisen,MaZongjin,ZhangXi,etal.Analysisofre centhorizontalcrustalstrainfieldandtectonicdeformationinthenortheastmarginofQinghaiTibetblock[J].SeismologyandGeology,2001,23(3):337-345.(inChinese)
10 江在森,丁平,王双绪,等.中国西部大地形变监测与地震预测[M ].北京:地震出版社,2001,7～46.
10 JiangZaisen,DingPing,WangShuangxu,etal.Thegeodeticdeformationmonitoringand predictionfortheearthquakeinwestChina[M ],Beijing:SeismologicalPress,2001.(inChinese)
1 WangShuangxu,ZhangXi,ZhangSixin,etal.Recenttec tonicdeformationanomalyandearthquakesinGansuNingxi aQinghaiarea[J].JournalofGeodesyandGeodynamics,2002,22(4):44-48.(inChinese)
2 乔学军,王琪,杜瑞林,等.昆仑山口西Ms8.1地震的地壳变形特征[J].大地测量与地球动力学,2002,22(4):6～11.
2 QiaoXuejun,WangQi,DuRuilin,etal.CharacteristicsofcrustaldeformationrelatingtoMs8.1kunlunshanearth quake[J].JournalofGeodesyandGeodynamics,2002,22(4):6-11.(inChinese)
3 王庆良,王文萍,崔笃信,等.青藏块体东北缘现今地壳运动[J].大地测量与地球动力学,2002,22(4):12～16.
3 WangQingliang,WangWenping,CuiDuxin,etal.Present daycrustalmovementofnortheasternmarginofQinghaiTi betblock[J].JournalofGeodesyandGeodynamics,2002,22(4):12-16.(inChinese)
4 张晓亮,江在森,陈兵,等.对青藏东北缘现今块体划分、运动及变形的初步研究[J].大地测量与地球动力学,2002,22(1):63～67.
4 ZhangXiaoliang,JiangZaisen,ChenBing,etal.Preliminaryresearchonpresentblockdemarcation,movementanddefor mationinnortheastmarginofQinghaiTibet[J].JournalofGeodesyandGeodynamics,2002,22(1):63-67.(inChi nese)
5 陈兵,江在森,马文静,等.青藏块体东北缘断层形变与中强地震[J].大地测量与地球动力学,2002,22(4):49～55.
5 ChenBing,JiangZaisen,MaWenjing,etal.Faultdeforma tionandmoderate strongearthquakesinnortheasternmarginofQinghaiTibetblock[J].JournalofGeodesyandGeody namics,2002,22(4):49-55.(inChinese)
6 薄万举,张祖胜,郭良迁,等.昆仑山口大地震与地形变异常的讨论[J].大地测量与地球动力学,2003,23(1)22～28.
6 BoWanju,ZhangZusheng,GuoLiangqian.DiscussionofKunlunmountainlargeearthquakeandrelatedanomaliesofcrustaldeformation[J].JournalofGeodesyandGeodynam ics,2003,23(1)22-28.(inChinese)
7 江在森,张希,崔笃信,等.青藏块体东北缘近期水平运动与变形[J].地球物理学报,2001,44(5):636～644.
7 JiangZaisen,ZhangXi,CuiDuxin,etal.Reccenthorizon talmovementanddeformationinthenortheastmarginofQinghaiXizangblock[J].ActaGeophysicaSinica,2001,44(5):636-644.(inChinese)
8 江在森,张希,陈兵,等.华北地区近期地壳水平运动与应力应变场特征[J].地球物理学报,2000,43(5):657～665
8 JiangZaisen,ZhangXi,ChenBing,etal.Thecharacteris ticsofreccentcrustalhorizontalmovementandstrainstressfieldinNorthChina[J].ActaGeophysicaSinica,2000,43(5):657-665.(inChinese)
9 江在森,马宗晋,张希,等.青藏块体东北缘水平应变场与构造变形分析[J].地震地质,2001,23(3):337～345
9 JiangZaisen,MaZongjin,ZhangXi,etal.Analysisofre centhorizontalcrustalstrainfieldandtectonicdeformationinthenortheastmarginofQinghaiTibetblock[J].SeismologyandGeology,2001,23(3):337-345.(inChinese)
10 江在森,丁平,王双绪,等.中国西部大地形变监测与地震预测[M ].北京:地震出版社,2001,7～46.
10 JiangZaisen,DingPing,WangShuangxu,etal.Thegeodeticdeformationmonitoringand predictionfortheearthquakeinwestChina[M ],Beijing:SeismologicalPress,2001.(inChinese)
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