星载SAR差分干涉测量提取汶川地震同震形变场
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摘要
采用合成孔径雷达差分干涉测量技术对2008年5月12日四川汶川地震(Ms=8.0)的形变信息进行了提取,并开展了研究,利用地震前后ALOS/PALSAR数据,进行重复轨道差分干涉处理,得到了震前—震后的干涉条纹图和形变结果图。由雷达视向形变图可知,此次地震造成了隆起形变,最大形变出现在北川—映秀断裂带上,最大雷达视向形变量超过了90 cm,形变范围较大,川西的大部分地方都出现了不同程度的地表形变。结合川西的地质和地型构造情况,根据地震同震形变场的空间分布特征,对形变特征和震源构造进行了分析,发现二者有很好的一致性。
Differential interferometric synthetic aperture radar(D-InSAR) was introduced to derive the deformation caused by Wenchuan earthquake(Ms=8.0) and the interferogram and the deformation result were obtained using two scenes ALOS/PALSAR data acquired respectively before and after the earthquake with the repeat-pass D-InSAR.From the deformation result in the radar line of sight(LOS) we can know that the Wenchuan earthquake leads to uplifting displacement and the maximum uplifting deformation in LOS is about 90 cm at the Beichuan-Yingxiu Fault.And there are varied degree of surface deformation in the most areas of west Sichuan.Considering the geological tectonism of the west Sichuan and spatial distribution of coseismic deformation field,the characters of the deformation and the earthquake source structure were analyzed.The result shows a good consistency.
Differential interferometric synthetic aperture radar(D-InSAR) was introduced to derive the deformation caused by Wenchuan earthquake(Ms=8.0) and the interferogram and the deformation result were obtained using two scenes ALOS/PALSAR data acquired respectively before and after the earthquake with the repeat-pass D-InSAR.From the deformation result in the radar line of sight(LOS) we can know that the Wenchuan earthquake leads to uplifting displacement and the maximum uplifting deformation in LOS is about 90 cm at the Beichuan-Yingxiu Fault.And there are varied degree of surface deformation in the most areas of west Sichuan.Considering the geological tectonism of the west Sichuan and spatial distribution of coseismic deformation field,the characters of the deformation and the earthquake source structure were analyzed.The result shows a good consistency.
引文
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[3]Peltzer G,CrampéF,King G,et a1.Evidence of nonlinear elasticity of the crust from Mw7.6 Manyi(Tibet)earthquake[J].Science,1999,286:273-276.
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[5]单新建,马瑾,柳稼航,等.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:D辑,2002,32(10):47-54.
[6]Lasserre C,Peltzer G,Crampe F,et a1.Coeismic deformation of the Mw7.8 Kokoxili earthquake in Tibet measured by synthetic aperture radar in-terferometry[J].J Geophys Res,2005,l10(B12)(B12408),doi:10.1029/2004JB003500.
[7]Wright TJ,Parsons B,England P,et a1.InSAR observations of low slip rates on the major faults of Western Tibet[J].Science,2004,305:236-239.
[8]Fialko Y.Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system[J].Nature,2006,441(04797):968-971.
[9]Hanssen R F.Radar Interferometry:Data Interpretation and Error Analysis[J].Kluwer Academic,2001.
[10]徐锡伟,闻学泽,郑荣章,等.川滇地区活动块体最新构造变动样式及其动力来源[J].中国科学:D辑,2003,33(B04):151-162.
[11]李延兴,杨国华,李智,等.中国大陆活动地块的运动与应变状态[J].中国科学:D辑,2003,33(z1):65-81.
[12]朱文耀,黄立人.利用GPS技术监测青藏高原地壳运动的初步结果[J].中国科学:D辑,1997,27(5):385-389.
[13]王二七,陈智梁.龙门山断裂带印支期左旋走滑运动及其大地构造成因[J].地学前缘,2001,8(2):375-384.
[14]刘和甫,梁慧社.川西龙门山冲断系构造样式与前陆盆地演化[J].地质学报,1994,68(2):101-118.
[15]Atsushi Iwashita,Marina Kudo,Hisatoshi Baba,et al.Study of ground surface displacement estimation using ALOS/PALSAR D-InSAR inter-ferometry[J].IGARSS’07,1616-1617,Barcelona,Spain,2007.
[16]陈运泰,许力生,张勇,等.2008年5月12日汶川特大地震震源特性分析报告[J].北京:中国地震局地球物理所,2008.
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