高频GPS测定的汶川Ms8.0级地震震时近场地表变形过程
摘要
以龙门山断裂带下盘的四川GPS连续观测网高频(1Hz)GPS观测资料为基础,得出了2008年5月12日发生在四川汶川的Ms8.0级大地震的震时近场地表形变过程.结果显示:地震在近场产生的最大形变量明显大于震后位移,破裂带北段各站水平分量震时先向震中方向运动,后转折垂直于破裂带方向运动,南段各站水平分量形变相对较小且基本为可恢复性变形.各站垂向均先下沉,然后呈周期性上下起伏波动.将高频GPS所得位移与强震仪所得结果进行对比分析,发现震动初期两者具有较好的一致性,但中后期虽然相位基本同步,但其振幅存在10cm左右的差异,其具体原因还需进一步研究论证.此次记录到的汶川大地震近场地表变形过程,可为进一步研究地表破裂过程和地震波的传播方式提供非常有价值的基础资料.
引文
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6殷海涛,张培震,甘卫军,等.利用高频GPS技术进行强震地面运动监测的研究进展.地球物理学进展,2009,24:2012—2019
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15张培震.青藏高原东缘川西地区的现今构造变形、应变分配与深部动力过程.中国科学D辑:地球科学,2008,38:1—15
16King R W,Bock Y.Documentation for the GAMIT GPS Analysis Software,Release10.2.Cambridge:Massachusetts Institute of Tech-nology,2004
17Boehm J,Heinkelmann R,Schuh H.A global model of pressure and temperature for geodetic applications.J Geodesy,2007,81:679—683
18Boehm J,Niell A,Tregoning P,et al.Global Mapping Function(GMF):A new empirical mapping function based on numerical weather model data.Geophys Res Lett,2006,33:L07304
19甘卫军,张锐,张勇,等.中国地壳运动观测网络的建设及应用.国际地震动态,2007,343:43—52
20Choi K,Bilich A,Larson K M,et al.Modified sidereal filtering:Implication for high-rate GPS positioning.Geophys Res Lett,2004,31:L24610,doi:10.1029/2004GL021621
21Altamimi Z,Sillard P,Boucher C.ITRF2000—New release of the international terrestrial reference frame for earth science applications.J Geophys Res,2002,107:B10,doi:10.1029/2001JB000561
22朱铉.数字地震仪的发展历史及展望.地球物理学进展,2002,17:301—304
2国家重大科学工程“中国地壳运动观测网络”项目组.汶川地震同震形变.中国科学D辑:地球科学,2008,38:1195—1206
3张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因.地球物理学报,2008,51:1066—1073
4徐锡伟,闻学泽,于慎鄂,等.汶川地震地表破裂的发现及其发震构造讨论.地震地质,2008,30:597—629
5王卫民,赵连锋,李娟,等.四川汶川8.0级地震震源过程.地球物理学报,2008,51:1403—1410
6殷海涛,张培震,甘卫军,等.利用高频GPS技术进行强震地面运动监测的研究进展.地球物理学进展,2009,24:2012—2019
7Kouba J.Measuring seismic waves induced by large earthquakes with GPS.Stud Geophys Geod,2003,47:741—755
8Larson K M,Bodin P,Gomberg J.Using1-Hz GPS data to measure deformations caused by the Denali Fault Earthquake.Science,2003,300:1421—1424
9Bock Y,Prawirodirdjo L,Melboume T.Detection of arbitrarily large dynamic ground motions with a dense high-rate GPS network.Geophys Res Lett,2004,31:L06604
10Miyazaki S,Laeson K,Choi K,et al.Modeling the rupture process of the2003Septempter25Tokachi-Oki(Hokkaido)earthquake using1Hz GPS data.Geophys Res Lett,2004,31:L21603
11Emore G,Haase J,Choi K,et al.Recovering absolute sesmic displacements through combined use of1-Hz GPS and strong motion accel-erometers.Bull Seismol Soc Am,2007,97:357—378
12Ji C,Larson M,Tan Y,et al.Slip history of the2003San Simon earthquake constrained by combining1-Hz GPS,strong motion,and teleseismic data.Geophys Res Lett,2004,31:L17068
13Wang G,Boore D M,Tang G,et al.Comparisons of ground motions from collocated and closely spaced one-sample-per-second Global Position System and accelerograph recordings of the2003M6.5San Simeon,California earthquake in the Parkfield region.Bull Seismol Soc Am,2007,97:76—90
14Ohta Y,Meiano I,Sagiya T,et al.Large surface wave of the2004Sumatra-Andaman earthquake captured by the very long baseline ki-nematic analysis of1-Hz GPS data.Earth Planets Space,2006,58:153—157
15张培震.青藏高原东缘川西地区的现今构造变形、应变分配与深部动力过程.中国科学D辑:地球科学,2008,38:1—15
16King R W,Bock Y.Documentation for the GAMIT GPS Analysis Software,Release10.2.Cambridge:Massachusetts Institute of Tech-nology,2004
17Boehm J,Heinkelmann R,Schuh H.A global model of pressure and temperature for geodetic applications.J Geodesy,2007,81:679—683
18Boehm J,Niell A,Tregoning P,et al.Global Mapping Function(GMF):A new empirical mapping function based on numerical weather model data.Geophys Res Lett,2006,33:L07304
19甘卫军,张锐,张勇,等.中国地壳运动观测网络的建设及应用.国际地震动态,2007,343:43—52
20Choi K,Bilich A,Larson K M,et al.Modified sidereal filtering:Implication for high-rate GPS positioning.Geophys Res Lett,2004,31:L24610,doi:10.1029/2004GL021621
21Altamimi Z,Sillard P,Boucher C.ITRF2000—New release of the international terrestrial reference frame for earth science applications.J Geophys Res,2002,107:B10,doi:10.1029/2001JB000561
22朱铉.数字地震仪的发展历史及展望.地球物理学进展,2002,17:301—304
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