基于SB-DInSAR时间序列探测地震形变过程的研究
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摘要
对2009年4月6日意大利拉奎拉6.3级地震9景ENVISAT重轨单视复数据采用双轨模式进行小基线(SB)干涉处理,获得了此次地震的SB-DInSAR时间序列干涉图、位移场以及位移速度场。结果表明:1)地震位移场形变过程为由震前的缓慢变化到震后的加速运动,速度明显由慢到快;2)震中以西为大面积隆起区,最大隆起量为140 mm;震中以东为大面积下沉区域,但形变集中在破裂区,主要在发震过程及震后形成,最大沉降量达185mm;3)地震产生的破裂主要沿震中的东南方向传播,集中在约13.4 km×7.6 km、方向约135°的椭圆形区域内。
On the basis of processing of 9-scene repeat track Single Look Complex Envisat ASAR data with Small Baseline(SB) method by 2-pass mode,a time series difference interferograms and deformation field and its velocity of L′Aquila Mw6.3 earthquake occurred on April 6,2009 were obtained.The results show as follows.1)There was an obvious process of displacement and its velocity from slow to speeded-up is determined from pre-seismic to post-seismic.2) In the analyzed area of about 54 km×59 km,westward of epicenter shows uplift,and its maximum uplift value is 140mm in the Line-Of-Sight(LOS) and the east to epicenter is subsidence area.However,the head subsidence region is a rupture area,and its majority formed in the course of shocking and subsequence.The maximum settlement reaches to 185 mm.3)The rupture propagates mainly southeastwards,about 135°,from epicenter,and concentrates on an elliptic area of about 13.4 km×7.6 km.
On the basis of processing of 9-scene repeat track Single Look Complex Envisat ASAR data with Small Baseline(SB) method by 2-pass mode,a time series difference interferograms and deformation field and its velocity of L′Aquila Mw6.3 earthquake occurred on April 6,2009 were obtained.The results show as follows.1)There was an obvious process of displacement and its velocity from slow to speeded-up is determined from pre-seismic to post-seismic.2) In the analyzed area of about 54 km×59 km,westward of epicenter shows uplift,and its maximum uplift value is 140mm in the Line-Of-Sight(LOS) and the east to epicenter is subsidence area.However,the head subsidence region is a rupture area,and its majority formed in the course of shocking and subsequence.The maximum settlement reaches to 185 mm.3)The rupture propagates mainly southeastwards,about 135°,from epicenter,and concentrates on an elliptic area of about 13.4 km×7.6 km.
引文
1杨久东,田辉,周春霞.基于D-InSAR技术的意大利拉奎拉地震同震形变分析[J].大地测量与地球动力学,2010,(1):9-13.(Yang Jiudong,Tian Hui and Zhou Chunxia.Coseismic deformation analysis of L'Aquila earthquake(Ita-ly)by using D-InSAR[J].Journal of Geodesy and Geody-namics,2010,(1):9-13)
2许才军,林敦灵,温扬茂.利用InSAR数据的汶川地震形变场提取及分析[J].武汉大学学报(信息科学版),2010,10:1 138-1 142.(Xu Caijun,Lin Dunling and WenYangmao.Extract and analysis surface deformation causedby Wenchuan Mw7.9 earthquake from InSAR data[J].Geo-matics and Information Science of Wuhan University,2010,10:1 138-1 142)
3王超,张红,刘智.基于D-InSAR的1993—1995年苏州市地面沉降监测[J].地球物理学报,2002,45(增刊):244-253.(Wang Chao,Zhang Hong and Liu Zhi.Subsid-ence of Suzhou city(China)from 1993 to 1995 detected byERS differential SAR interferometry[J].Chinese Journal ofGeophysics,2002,45(supl.):244-253)
4 Gatelli F,et al.The wavenumber shift in SAR interferometry[J].IEEE Trans Geosci Remote Sens.,1994,32(4):855-865.
5葛大庆,等.利用小基线差分干涉纹图集监测地表形变场[J].大地测量与地球动力学,2008,(2):61-66.(GeDaqing,et al.Surface deformation field monitoring by use ofsmall-baseline differential interferograms stack[J].Journalof Geodesy and Geodynamics,2008,(2):61-66)
6吴宏安,等.基于小基线DInSAR技术监测太原市2003—2009年地表形变场[J].地球物理学报,2011,54(3):673-680.(Wu Hongan,et al.Ground deformation monitoringusing small baseline DInSAR technique:A case study inTaiyuan City from 2003 to 2009[J].Chinese Journal of Ge-ophysics,2011,54(3):673-680)
7 Roberts G P and M ichetti A M.Spatial and temporal varia-tions in growth rates along active normal fault systems:an ex-am ple from The Lazio Abruzzo Apennines,central Italy[J].Journal of Structural Geology,2004,26:339-376.
8张勇,陈运泰,许力生.2009年4月6日意大利拉奎拉(L'Aquila)Mw 6.3地震的破裂过程[J].地球物理学报,2010,53(6):1428-1439.(Zhang Yong,Chen Yuntai andXu Lisheng.Rupture process of 6 April 2009 L'Aquila,Italy,Mw6.3 earthquake a comparison between apparent sourcetime function method and direct wave inversion method[J].Chinese Journal of Geophysics,2010,53(6):1 428-1439)
2许才军,林敦灵,温扬茂.利用InSAR数据的汶川地震形变场提取及分析[J].武汉大学学报(信息科学版),2010,10:1 138-1 142.(Xu Caijun,Lin Dunling and WenYangmao.Extract and analysis surface deformation causedby Wenchuan Mw7.9 earthquake from InSAR data[J].Geo-matics and Information Science of Wuhan University,2010,10:1 138-1 142)
3王超,张红,刘智.基于D-InSAR的1993—1995年苏州市地面沉降监测[J].地球物理学报,2002,45(增刊):244-253.(Wang Chao,Zhang Hong and Liu Zhi.Subsid-ence of Suzhou city(China)from 1993 to 1995 detected byERS differential SAR interferometry[J].Chinese Journal ofGeophysics,2002,45(supl.):244-253)
4 Gatelli F,et al.The wavenumber shift in SAR interferometry[J].IEEE Trans Geosci Remote Sens.,1994,32(4):855-865.
5葛大庆,等.利用小基线差分干涉纹图集监测地表形变场[J].大地测量与地球动力学,2008,(2):61-66.(GeDaqing,et al.Surface deformation field monitoring by use ofsmall-baseline differential interferograms stack[J].Journalof Geodesy and Geodynamics,2008,(2):61-66)
6吴宏安,等.基于小基线DInSAR技术监测太原市2003—2009年地表形变场[J].地球物理学报,2011,54(3):673-680.(Wu Hongan,et al.Ground deformation monitoringusing small baseline DInSAR technique:A case study inTaiyuan City from 2003 to 2009[J].Chinese Journal of Ge-ophysics,2011,54(3):673-680)
7 Roberts G P and M ichetti A M.Spatial and temporal varia-tions in growth rates along active normal fault systems:an ex-am ple from The Lazio Abruzzo Apennines,central Italy[J].Journal of Structural Geology,2004,26:339-376.
8张勇,陈运泰,许力生.2009年4月6日意大利拉奎拉(L'Aquila)Mw 6.3地震的破裂过程[J].地球物理学报,2010,53(6):1428-1439.(Zhang Yong,Chen Yuntai andXu Lisheng.Rupture process of 6 April 2009 L'Aquila,Italy,Mw6.3 earthquake a comparison between apparent sourcetime function method and direct wave inversion method[J].Chinese Journal of Geophysics,2010,53(6):1 428-1439)
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