利用GPS数据研究低纬度环球剪切带的活动性
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摘要
利用GPS速度研究了低纬度环球剪切带主要断裂的活动性,结果显示:北安纳托利亚断裂、北高加索断裂、嘉黎断裂、实皆断裂以及苏门答腊断裂均表现为右旋走滑特征,滑动速率分别为13.7±0.6、5.8±0.5、7.1±1.0、12.7±0.2和25.4±0.5 mm/a;索龙断裂和危地马拉断裂呈现左旋走滑特征,滑动速率分别为29.2±1.8、14.1±1.0 mm/a;嘉黎断裂和苏门答腊断裂表现出强挤压性,挤压量分别为18.5±1.0、15.2±0.6 mm/a;索龙断裂表现出强拉张性,拉张量为10.7±1.1 mm/a。低纬度剪切带总体上表现出较强的活动性并以剪切活动为主。
Global Positioning System(GPS) measure campaign in shear zone at low-latitudes was conducted in 1991 and 2003,for quantifying the present-day major faults' activity.The results are as follow,the north Antolia fault,Jiali fault,Sagaing fault and Sumatra fault are right lateral motion,the rates are(13.7±0.6),(5.8±0.5)(7.1±1.0),(12.7±0.2)and(25.4±0.5)mm/a respectively;while the Sorong fault and Guatemala fault are left lateral motion,the rates are 29.2±1.8),(14.1±1.0)mm/a,respectively.Besides,Sumatra fault and Jiali fault also show strong squeezing,(18.5±1.0),(15.2±0.6) mm / a,respectively,while Sorong fault show powerful pull,reached to :(10.7±1.1) mm / a.Overall,the shear activity dominats in the shear zone at low-latitudes.
Global Positioning System(GPS) measure campaign in shear zone at low-latitudes was conducted in 1991 and 2003,for quantifying the present-day major faults' activity.The results are as follow,the north Antolia fault,Jiali fault,Sagaing fault and Sumatra fault are right lateral motion,the rates are(13.7±0.6),(5.8±0.5)(7.1±1.0),(12.7±0.2)and(25.4±0.5)mm/a respectively;while the Sorong fault and Guatemala fault are left lateral motion,the rates are 29.2±1.8),(14.1±1.0)mm/a,respectively.Besides,Sumatra fault and Jiali fault also show strong squeezing,(18.5±1.0),(15.2±0.6) mm / a,respectively,while Sorong fault show powerful pull,reached to :(10.7±1.1) mm / a.Overall,the shear activity dominats in the shear zone at low-latitudes.
引文
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14 Bock Y,et al.Crustal motion in Indonesia from Global Posi-tioning System measurements[J].J.Geophys.Res.,2001,108(B8):2 367.
15陈健,陶本藻.大地形变测量学[M].北京:地震出版社,1987.(Chen Jian andTao Benzao.Earth DeformationSurveying[M].Beijing:Earthquake Press,1987)
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20王小亚,等.GPS监测的中国及其周边现时地壳形变[J]地球物理学报,2002,45(2):198-209(Wang Xi-aoya,et al.Present-time crustal deformation in China and itssurrounding regions by GPS[J].J.Geophys.,2002,45(2):198-209)
21 Le Dain A Y,P Tapponnier and P Molnar.Active faultingand tectonics of Burma and surrounding regions[J].J.Geophys.Res.,1984,89:453–472.
22 Guzmanspeziale M and J F Ni.Seismicity and active tec-tonics of the western Sunda Arc,in The Tectonic Evolutionof Asia[M].New York:Cambridge Univ.Press,1996:63-84.
23 Socquet A,et al.India and Sunda plates motion and de-formation along their boundary in Myanmar determined byGPS[J].J.Geophys.Res.,2006,111:B05406.
24 Bellier and M sebrier.Is the slip rate variation on the GreatSumatra Fault accommodated by fore-arc stretching?[J].Geophys.Res.Lett.,1995,22(15):1 969-1 972.
25 Bock Y,et al.Crustal motion in indonesia from Global Posi-tioning System measurements[J].J.Geophys.Res.,2003,108(B8):1-3.
2杜品仁,等.低纬度环球带和环太平洋带大地震的幕式活动分析[J].地球物理学报,2010,53(12):2 869-2 874.(Du Pinren,et al.An analysis on episodes of greatearthquakes in the low-latitude circum-earth zone and cir-cum Pacific zone[J].Chinese J.Geophys,2010,53(12):2 869-2 874)
3 Straub C and H Kahle.Active crustal deformation in the Mar-mara Sea Region,NW Anatolia,Inferred from GPS measure-ments[J].Geophys.Res.Lett.,1995,22(18):2 533-2 536.
4任金卫,等.西藏东南部嘉黎断裂新知[J].地震地质,2000,(12):344-355.(Ren Jinwei,et al.Quaternaryfaulting of Jiali fault southeast Tibetan plateau[J].Seismol-ogy and Geology,2000(12):344-355)
5 Vigny C,etal.Present-day crustal deformation around Saga-ing fault,Myanmar[J].J.Geophys.Res.,108(B11):2533.
6 Sieh K and D Natawidjaja.Neotectonics of the Sumatranfault,Indonesia[J].J.Geophys.Res.,2000,105(B12):28 295-28 326.
7 Socquet A,et al.Microblock rotations and fault coupling inSE Asia triple junction(Sulawesi,Indonesia)from GPS andearthquake slip vector data[J].J.Geophys.Res.,2006,111,:B08409.
8 Lyon-Caen H,et al.Kinematics of the North American-Car-ibbean-Cocos plates in Central America from new GPS meas-urements across the Polochic-Motagua fault system[J].Geo-phys.Res.Lett.,2006,33:L19309.
9 Floyd M A,et al.A new velocity field for Greece:Implica-tions for the kinematics and dynamics of the Aegean[J].J.Geophys.Res.,2000,115:B10403.
10 Ch Reigber,et al.New space geodetic constraints on thedistribution of deformation in Central Asia[J].Earth andPlanetary Science Letters,2001,191:157-165.
11 Ma Z,et al.Contemporary crustal movement of continentalChina obtained by Global Positioning System(GPS)meas-urements[J].Sci.Bull,2010,46(13):1 118-1 120.
12 Zhang P,et al.Continuous deformation of the Tibetan Plat-eau from global positioning system data[J].Geology,2004,32:809-812.
13 Niu Z,e tal.Contemporary velocity field of crustal move-ment of Chinese mainland from Global Positioning Systemmeasurements[J].Chin.Sci.Bull.,2005,50(9):939–941.
14 Bock Y,et al.Crustal motion in Indonesia from Global Posi-tioning System measurements[J].J.Geophys.Res.,2001,108(B8):2 367.
15陈健,陶本藻.大地形变测量学[M].北京:地震出版社,1987.(Chen Jian andTao Benzao.Earth DeformationSurveying[M].Beijing:Earthquake Press,1987)
16 Ambraseys N N.Some characteristic features of the AntolianFault zone[J].Tectonophysics,1970,9:143-165.
17 Barka A.The North Anatolian fault zone[J].Annales Tec-tonicase,1992,6(Supp.):164-195.
18 Taymaz T,Eyidogan H and Jackson J.Source parametersof lager earthquakes in the East Anatolian Fault Zone(Tur-key)[J].Geophy.J.Int.,1991,106:537-550.
19 Onur Tan and Tucncay Taymaz.Active tectonics of theCaucasus:Earthquake source mechanisms and rupture his-tories obtained from inversion of teleseismic body wave-forms[J].GSA Special paper,2006,409:531-578.
20王小亚,等.GPS监测的中国及其周边现时地壳形变[J]地球物理学报,2002,45(2):198-209(Wang Xi-aoya,et al.Present-time crustal deformation in China and itssurrounding regions by GPS[J].J.Geophys.,2002,45(2):198-209)
21 Le Dain A Y,P Tapponnier and P Molnar.Active faultingand tectonics of Burma and surrounding regions[J].J.Geophys.Res.,1984,89:453–472.
22 Guzmanspeziale M and J F Ni.Seismicity and active tec-tonics of the western Sunda Arc,in The Tectonic Evolutionof Asia[M].New York:Cambridge Univ.Press,1996:63-84.
23 Socquet A,et al.India and Sunda plates motion and de-formation along their boundary in Myanmar determined byGPS[J].J.Geophys.Res.,2006,111:B05406.
24 Bellier and M sebrier.Is the slip rate variation on the GreatSumatra Fault accommodated by fore-arc stretching?[J].Geophys.Res.Lett.,1995,22(15):1 969-1 972.
25 Bock Y,et al.Crustal motion in indonesia from Global Posi-tioning System measurements[J].J.Geophys.Res.,2003,108(B8):1-3.
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