2001年昆仑山口西8.1级地震同震形变场特征的初步分析
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摘要
利用差分干涉雷达测量技术获取的宏观震中区的同震形变场 ,结合对地震活动性、震源机制、野外考察等资料分析 ,对昆仑山口西 8.1级地震同震形变场特征进行了研究 .结果表明 :宏观震中位于库赛湖东北侧 ,宏观震中区发震断层可分为两个形变中心区域 ,其中西段长约 4 2km ,东段长约 4 8km ,整个发震断层主破裂段长 90km ;由干涉形变条纹分布格局可清楚地判断出发震断层的左旋走滑特征 ;断层两盘变形特征不同 ,南盘变形程度明显大于北盘 ;宏观震中附近最大斜距向位移量为 2 88.4cm ,最小斜距向位移量为 2 2 4 .0cm ,宏观震中发震断层最大左旋水平位错为 738.1cm ,最小地面左旋水平位错为 5 5 1.8cm .
Based on the analysis of coseismic deformation in the macroscopic epicentral region extracted by Differential Interferometric Synthetic Aperture Radar (D-InSAR), and combined with the seismic activity, focal mechanism solutions of the earthquake and field investigation, the characteristic of coseismic deformation of M S=8.1 western Kunlunshan Pass earthquake in 2001 was researched. The study shows that its epicenter lies in the northeast side of Hoh Sai Hu; and the seismogenic fault in the macroscopic epicentral region can be divided into two central deformation fields: the west and east segments with the lengths of 42 km and 48 km, respectively. The whole fault extends about 90 km. From the distribution of interferometry fringes, the characteristic of sinistral strike slip of seismogenic fault can be identified clearly. The deformations on both sides of the fault are different with an obviously higher value on the south side. In the vicinity of macroscopic epicenter, the maximum displacement in look direction is about 288.4 cm and the minimum is 224.0 cm; the maximum sinistral horizontal dislocation of seismogenic fault near the macroscopic epicenter is 738.1 cm and the minimum is 551.8 cm.
Based on the analysis of coseismic deformation in the macroscopic epicentral region extracted by Differential Interferometric Synthetic Aperture Radar (D-InSAR), and combined with the seismic activity, focal mechanism solutions of the earthquake and field investigation, the characteristic of coseismic deformation of M S=8.1 western Kunlunshan Pass earthquake in 2001 was researched. The study shows that its epicenter lies in the northeast side of Hoh Sai Hu; and the seismogenic fault in the macroscopic epicentral region can be divided into two central deformation fields: the west and east segments with the lengths of 42 km and 48 km, respectively. The whole fault extends about 90 km. From the distribution of interferometry fringes, the characteristic of sinistral strike slip of seismogenic fault can be identified clearly. The deformations on both sides of the fault are different with an obviously higher value on the south side. In the vicinity of macroscopic epicenter, the maximum displacement in look direction is about 288.4 cm and the minimum is 224.0 cm; the maximum sinistral horizontal dislocation of seismogenic fault near the macroscopic epicenter is 738.1 cm and the minimum is 551.8 cm.
引文
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单新建,马瑾,王长林,等.2002.利用星载D InSAR技术获取的地表形变场提取玛尼地震震源断层参数[J].中国科学,32(10):837～844
沈军,尹光华,赵瑞兵.2002.2001年11月14日新疆青海交界东昆仑山8.1级地震构造背景初探[J].内陆地震,16(1):1～7
王超,刘智,张红,等.2000.张北尚义地震同震形变场雷达差分干涉测量[J].科学通报,45(23):2550～2553
徐锡伟,陈文彬,于贵华,等.2002.2001年11月14日昆仑山库赛湖地震(MS8.1)地表破裂带的基本特征[J].地震地质,24(1):1～13
赵瑞斌,李军,向志勇,等.2002.昆仑山口西8.1级地震地表破裂带西段考察[J].内陆地震,16(2):175～179
MassonnetD ,RossiM ,CarmonaC ,etal.1993.ThedisplacementfieldoftheLandersearthquakemappedbyradarinterfer ometry[J].Nature,364:138～142
MeyerB ,ArmijoR ,MassonnetD ,etal.1996.The1995Grevena(NorthernGreece)earthquake:FaultmodelconstrainedwithtectonicobservationandSARinterferometry[J].GeophyResLetters,23(19):2677～2680
MichelR ,AvouacJ .2002.Deformationduetothe17August1999Izmit,Turkey,earthquakemeasuredfromSPOTimages[J].JGeophysRes,107(B4):ETG21～27
PeltzerG ,CrampeF ,KingG ,etal.1999.EvidenceofnonlinearelasticityofthecrustfromtheMW7.6Mani(Tibet)earth quake[J].Science,286:272～276
RodriguezE ,MartinJ .1992.Theoryanddesignofinterferometricsyntheticapertureradars[J].IEEEProcofRadarandSignalProcessing,139:147～159
ZebkerHA ,RosenPA ,GoldsteinRM ,etal.1994.Onthederivationofcoseismicdisplacementfieldsusingdifferentialradarinterferometry:TheLandersearthquake[J].JGeophysRes,99B(10):19617～19634
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