基于InSAR形变数据分析台湾纵谷断层南段现今运动特征
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摘要
本文利用2007—2010年花东纵谷南段区域的InSAR形变数据作为约束,采用分段断层模型和层状介质模型,反演中国台湾东部纵谷断层南段滑动速率空间分布,并据此分析断层运动特征。研究结果表明,纵谷断层南段整体以逆冲运动为主,兼具左旋走滑运动。纵谷断层南段的滑动速率具有空间非均匀性,在空间上可以细分为深浅两个极值区,浅部(0~15 km)最大滑动速率为10 cm/a,位于深度2.5 km左右;深部(15~30 km)最大滑动速率为21 cm/a,位于深度25 km左右。反演结果与用重复地震估算的深部滑动速率基本吻合。
Based on segmented fault model and layered model,this paper use constraints from synthetic aperture radar interferometry( In SAR) deformation observations between 2007 and2010,to invert spatial distribution of slip rate in the southern Longitudinal Valley Fault in eastern Taiwan,China,and then analyze the characteristics of fault movement. The results show that,the southern Longitudinal Valley fault movement is dominanted by thrust with less left-lateral component. The slip rate of the southern Longitudinal Valley Fault has a non-uniform spatial distribution,and it can be divided into two extremes,the maximum slip rate in the shallow part( 0 ~ 15km) is about 10 cm / a,located at the depth of about 2. 5 km; and the maximum slip rate in the deep part( 15 ~ 30 km) is about 21 cm / a,located at the depth of about 25 km. The inversion results are consistent with the deep slip rate estimated by repeating earthquake.
Based on segmented fault model and layered model,this paper use constraints from synthetic aperture radar interferometry( In SAR) deformation observations between 2007 and2010,to invert spatial distribution of slip rate in the southern Longitudinal Valley Fault in eastern Taiwan,China,and then analyze the characteristics of fault movement. The results show that,the southern Longitudinal Valley fault movement is dominanted by thrust with less left-lateral component. The slip rate of the southern Longitudinal Valley Fault has a non-uniform spatial distribution,and it can be divided into two extremes,the maximum slip rate in the shallow part( 0 ~ 15km) is about 10 cm / a,located at the depth of about 2. 5 km; and the maximum slip rate in the deep part( 15 ~ 30 km) is about 21 cm / a,located at the depth of about 25 km. The inversion results are consistent with the deep slip rate estimated by repeating earthquake.
引文
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[15]Wu Y M,Chang C H,Zhao L,et al.Seismic tomography of Taiwan:Improved constraints from a dense network of strong motion stations[J].Journal of Geophysical Research,2007,112:B08312,doi:10.1029/2007JB004983.
[16]Wang R,Xia Y,Grosser H,et al.The 2003 Bam(SE Iran)earthquake:precise source parameters from satellite radar interferometry[J].Geophysical Journal International,2004,159(3):917-922.
[17]Chen K H,Nadeau R M,Rau R J.Characteristic repeating earthquakes in an arc-continent collision boundary zone:The Chihshang fault of eastern Taiwan[J].Earth and Planetary Science Letters,2008,276(3):262-272.
[18]Angelier J,Chu H T,Lee J C.Shear concentration in a collision zone:kinematics of the Chihshang Fault as revealed by outcrop-scale quantification of active faulting,Longitudinal Valley,eastern Taiwan[J].Tectonophysics,1997,274(1-3):117-143.
[19]Cheng L W,Lee J C,Hu J C,et al.Coseismic and postseismic slip distribution of the 2003 MW=6.5Chengkung earthquake in eastern Taiwan:Elastic modeling from inversion of GPS data[J].Tectonophysics,2009,466(3):335-343.
[20]Wu Y,Chen Y,Shin T,et al.Coseismic versus interseismic ground deformations,fault rupture inversion and segmentation revealed by 2003 MW6.8 Chengkung earthquake in eastern Taiwan[J].Geophysical Research Letters,2006,33:L02312,doi:10.1029/2005GL024711.
[2]Yu S B,Kuo L C.Present-day crustal motion along the Longitudinal Valley Fault,eastern Taiwan[J].Tectonophysics,2001,333(1):199-217.
[3]Shyu J B H,Sieh K,Chen Y G,et al.Geomorphic analysis of the Central Range fault,the second major active structure of the Longitudinal Valley suture,eastern Taiwan[J].Geological Society of America Bulletin,2006,118(11-12):1 447-1 462.
[4]Shyu J B H,Sieh K,Chen Y G,et al.Neotectonic architecture of Taiwan and its implications for future large earthquakes[J].Journal of Geophysical Research,2005,110:B08402,doi:10.1029/2004JB003251.
[5]Lee J C,Angelier J,Chu H T,et al.Active fault creep variations at Chihshang,Taiwan,revealed by creep meter monitoring,1998-2001[J].Journal of Geophysical Research,2003,108(B11):2 528,doi:10.1029/2003JB002394.
[6]Lee J C,Angelier J,Chu H T,et al.Monitoring active fault creep as a tool in seismic hazard mitigation.Insights from creepmeter study at Chihshang,Taiwan[J].Comptes Rendus Geoscience,2005,337(13):1 200-1 207.
[7]Champenois J,Fruneau B,Pathier E,et al.Monitoring of active tectonic deformations in the Longitudinal Valley(Eastern Taiwan)using Persistent Scatterer In SAR method with ALOS PALSAR data[J].Earth and Planetary Science Letters,2012,337-338:144-155.
[8]Hsu L,Bürgmann R.Surface creep along the Longitudinal Valley fault,Taiwan from In SAR measurements[J].Geophysical Research Letters,2006,33(6).
[9]Chen K H,Toda S,Rau R J.A leaping,triggered sequence along a segmented fault:The 1951 ML7.3Hualien-Taitung earthquake sequence in eastern Taiwan[J].Journal of Geophysical Research,2008,113:B02304,doi:10.1029/2007JB005048.
[10]Chung L H,Chen Y G,Wu Y M,et al.Seismogenic faults along the major suture of the plate boundary deduced by dislocation modeling of coseismic displacements of the 1951 M7.3 Hualien-Taitung earthquake sequence in eastern Taiwan[J].Earth and Planetary Science Letters,2008,269(3):416-426.
[11]Hsu Y J,Yu S B,Chen H Y.Coseismic and postseismic deformation associated with the 2003Chengkung,Taiwan,earthquake[J].Geophysical Journal International,2009,176(2):420-430.
[12]Peyret M,Dominguez S,Cattin R,et al.Present-day interseismic surface deformation along the Longitudinal Valley,eastern Taiwan,from a PS-In SAR analysis of the ERS satellite archives[J].Journal of Geophysical Research,2011,116(B3).
[13]Lohman R B,Simons M.Some thoughts on the use of In SAR data to constrain models of surface deformation:Noise structure and data downsampling[J].Geochemistry,Geophysics,Geosystems,2005,6(1):Q01007,doi:10.1029/2004GC000841.
[14]Thomas M Y,Avouac J P,Champenois J,et al.Spatiotemporal evolution of seismic and aseismic slip on the Longitudinal Valley Fault,Taiwan[J].Journal of Geophysical Research,2014,119(6):5 114-5 139.
[15]Wu Y M,Chang C H,Zhao L,et al.Seismic tomography of Taiwan:Improved constraints from a dense network of strong motion stations[J].Journal of Geophysical Research,2007,112:B08312,doi:10.1029/2007JB004983.
[16]Wang R,Xia Y,Grosser H,et al.The 2003 Bam(SE Iran)earthquake:precise source parameters from satellite radar interferometry[J].Geophysical Journal International,2004,159(3):917-922.
[17]Chen K H,Nadeau R M,Rau R J.Characteristic repeating earthquakes in an arc-continent collision boundary zone:The Chihshang fault of eastern Taiwan[J].Earth and Planetary Science Letters,2008,276(3):262-272.
[18]Angelier J,Chu H T,Lee J C.Shear concentration in a collision zone:kinematics of the Chihshang Fault as revealed by outcrop-scale quantification of active faulting,Longitudinal Valley,eastern Taiwan[J].Tectonophysics,1997,274(1-3):117-143.
[19]Cheng L W,Lee J C,Hu J C,et al.Coseismic and postseismic slip distribution of the 2003 MW=6.5Chengkung earthquake in eastern Taiwan:Elastic modeling from inversion of GPS data[J].Tectonophysics,2009,466(3):335-343.
[20]Wu Y,Chen Y,Shin T,et al.Coseismic versus interseismic ground deformations,fault rupture inversion and segmentation revealed by 2003 MW6.8 Chengkung earthquake in eastern Taiwan[J].Geophysical Research Letters,2006,33:L02312,doi:10.1029/2005GL024711.