昆明周边地区活动断层滑动与现代构造应力场
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摘要
昆明盆地是一个受南北向活动断裂控制的新生代断陷盆地.昆明盆地及其周边地区共有8条主要断裂带,野外地震地质调查和断裂滑动观测表明,南北向和北东向活动断裂以左旋走滑为主,北西向活动断裂以右旋走滑为主.采用野外观测取得的22个测点共706条活断层擦痕数据,利用断层滑动资料反演构造应力张量的方法,计算获得了研究区现代构造应力场主要特征:昆明盆地及其周边地区现代构造应力场以北北西—南南东向挤压、北东东—南西西向拉张为特征,其最大主压应力(σ1)方向为333°—2°,平均倾角21°;最小主压应力(σ3)方向为44°—93°,平均倾角14°;中间主应力(σ2)倾角较陡,近垂直.应力结构均为走滑型.断层滑动反演结果与震源机制解资料分析结果基本一致.
Kunming basin is a Cenozoic faulted basin controlled by South--North striking active faults. In and around the Kunming basin there are totally 8 major active fault zones. Result of field geologic survey and fault slip observation indicates that the N--S and NE--SW striking faults are mainly of left-lateral strike-slip motion,while NW--SE striking ones are mainly right-lateral faults. We have measured 706 slicken-slides on active faults at 22 observation sites. By inverting these fault slip data we obtained the following result on the characteristics of contemporary tectonic stress field in the research region: In the Kunming basin region the maximum compression is generally in horizontal NNW--SSE direction, while the principal relative tension appears nearly in horizontal NE--SW,and the stress regime is of strike-slip faulting type. The direction of the maximum compressional stress(σ1)is in 333°—2°, and the average pluge is 21°. The minimum principal stress(σ3) is in 44°—93° , and the average plunge is 14°, and the intermediate principal stress(σ2) is nearly vertical. The result obtained by inverting fault slip data is in accordance with that by inverting earthquake focal mechanism solutions in Kunming and its adjacent region.
Kunming basin is a Cenozoic faulted basin controlled by South--North striking active faults. In and around the Kunming basin there are totally 8 major active fault zones. Result of field geologic survey and fault slip observation indicates that the N--S and NE--SW striking faults are mainly of left-lateral strike-slip motion,while NW--SE striking ones are mainly right-lateral faults. We have measured 706 slicken-slides on active faults at 22 observation sites. By inverting these fault slip data we obtained the following result on the characteristics of contemporary tectonic stress field in the research region: In the Kunming basin region the maximum compression is generally in horizontal NNW--SSE direction, while the principal relative tension appears nearly in horizontal NE--SW,and the stress regime is of strike-slip faulting type. The direction of the maximum compressional stress(σ1)is in 333°—2°, and the average pluge is 21°. The minimum principal stress(σ3) is in 44°—93° , and the average plunge is 14°, and the intermediate principal stress(σ2) is nearly vertical. The result obtained by inverting fault slip data is in accordance with that by inverting earthquake focal mechanism solutions in Kunming and its adjacent region.
引文
何宏林,方仲景,李坪.1993.小江断裂带西支断裂南段新活动初探[J].地震研究,16(3):291--298.
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乔学军,王琪,杜瑞林.2004.川滇地区活动地块现今地壳变形特征[J].地球物理学报,47(5):805--811.
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王绍晋,龙晓帆,余庆坤.2005.昆明地区现代构造应力场分析[J].地震研究,28(2):178--184.
谢富仁,刘光勋.1989.阿尔金断裂带中段区域新构造应力场分析[J].中国地震,5(3):26--36.
谢富仁,祝景忠,梁海庆,刘光勋.1993.中国西南地区现代构造应力场基本特征[J].地震学报,15(4):407--417.
谢富仁,刘光勋,梁海庆.1994.滇西北及邻区现代构造应力场[J].地震地质,16(4):329--338.
谢富仁,苏刚,崔效锋,舒赛兵,赵健涛.2001.滇西南地区现代构造应力场分析[J].地震学报,23(1):17--23.
许忠淮,戈澍谟.1984.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,6(4):395--404.
俞维贤,谢英情,张建国,杨继武.2004.昆明盆地周边地区主要断裂活动时代研究[J].地震研究,27(4):357--362.
张岳桥,施炜,廖昌珍,胡博.2006.鄂尔多斯盆地周边断裂运动学分析与晚中生代构造应力体制转换[J].地质学报,80(5):639--647.
Angelier J.1979.Determination of the mean principal direction of stresses for a given fault population[J].Tectonophy-sics,56:17--28.
Etchcopat A.Vsseur G,Daignieres M.1981.Aninverse problemin microtectonics for the deternfination of stress ten-sors fromfault striation analysis[J].Journal of Structural Geology,(3):51--55.
Gaais D,Cobbold P R,Bourgeois O,Rouby B,Urreiztieta MD.2000.Tectonic significance of fault-slip date[J].Jour-nal of Structural Geology,22(7):881--888.
Garcia S,Angelier J,Bergerat F,Homberg C.2002.Tectonic analysis of an oceanic transformfault zone based onfault-slip data and earthquake focal mechanisms:The H挷sav姫k-Flatey fault zone,Iceland[J].Tectonophysics,344(3--4):157--174.
Yamaji A,Otsubo M,Sato K.2006.Paleostress analysis usingthe Houghtransformfor separating stresses fromhetero-geneous fault-slip data[J].Journal of Structural Geology,28(6):980--990.
姜朝松,周瑞琦,胡耀雄.2003a.昆明盆地的地质构造特征[J].地震研究,26(1):67--74.
姜朝松,周瑞琦,王绍晋.2003b.昆明盆地形成模式及其演化[J].地震研究,26(2):172--175.
乔学军,王琪,杜瑞林.2004.川滇地区活动地块现今地壳变形特征[J].地球物理学报,47(5):805--811.
沈军,王一鹏,宋方敏,曹忠权,申旭辉,俞维闲,侯学英,李志祥.1997.小江断裂带中段的北东向断裂与断块结构[J].地震地质,19(3):203--210.
唐文清,刘宇平,陈智梁,张清志,赵济湘.2006.云南小江断裂中南段现今活动特征[J].沉积与特提斯地质,26(2):21--24.
王绍晋,龙晓帆,余庆坤.2005.昆明地区现代构造应力场分析[J].地震研究,28(2):178--184.
谢富仁,刘光勋.1989.阿尔金断裂带中段区域新构造应力场分析[J].中国地震,5(3):26--36.
谢富仁,祝景忠,梁海庆,刘光勋.1993.中国西南地区现代构造应力场基本特征[J].地震学报,15(4):407--417.
谢富仁,刘光勋,梁海庆.1994.滇西北及邻区现代构造应力场[J].地震地质,16(4):329--338.
谢富仁,苏刚,崔效锋,舒赛兵,赵健涛.2001.滇西南地区现代构造应力场分析[J].地震学报,23(1):17--23.
许忠淮,戈澍谟.1984.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,6(4):395--404.
俞维贤,谢英情,张建国,杨继武.2004.昆明盆地周边地区主要断裂活动时代研究[J].地震研究,27(4):357--362.
张岳桥,施炜,廖昌珍,胡博.2006.鄂尔多斯盆地周边断裂运动学分析与晚中生代构造应力体制转换[J].地质学报,80(5):639--647.
Angelier J.1979.Determination of the mean principal direction of stresses for a given fault population[J].Tectonophy-sics,56:17--28.
Etchcopat A.Vsseur G,Daignieres M.1981.Aninverse problemin microtectonics for the deternfination of stress ten-sors fromfault striation analysis[J].Journal of Structural Geology,(3):51--55.
Gaais D,Cobbold P R,Bourgeois O,Rouby B,Urreiztieta MD.2000.Tectonic significance of fault-slip date[J].Jour-nal of Structural Geology,22(7):881--888.
Garcia S,Angelier J,Bergerat F,Homberg C.2002.Tectonic analysis of an oceanic transformfault zone based onfault-slip data and earthquake focal mechanisms:The H挷sav姫k-Flatey fault zone,Iceland[J].Tectonophysics,344(3--4):157--174.
Yamaji A,Otsubo M,Sato K.2006.Paleostress analysis usingthe Houghtransformfor separating stresses fromhetero-geneous fault-slip data[J].Journal of Structural Geology,28(6):980--990.
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