M_w9.0日本Tohoku大地震静态位错模型:陆地GPS资料和海底GPS/Acoustic资料联合反演的结果
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摘要
采用分层介质模型,联合陆地GPS资料和海底GPS/Acoustic资料反演了Mw9.0日本Tokohu大地震的静态位错模型.反演中,根据先验信息引入更切合实际的断层几何构型,即倾角随深度增加,而走向角则随海沟的走向而变化.结果显示,这次地震的地震矩为3.68×1022Nm,对应的矩震级为9.01,最大同震滑移量约为45.8m.位错主要分布在从39.6°N延伸至36.97°N约240km的范围,并且绝大部分位移在小于40km的断层浅部.检测板测试结果显示,相对于仅使用陆地GPS资料的情况,联合反演能更好地分辨断层的位错分布情况,联合反演结果更真实地反映了断层的破裂情况.
引文
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2Ammon C J,Lay T,Kanamori H,et al.A rupture model of the2011off the Pacific coast of Tohoku Earthquake.Earth Plantes Space,2011,63:693-696
3Lay T,Ammon C J,Kanamori H,et al.Possible large near-trench slip during the2011Mw9.0off the Pacific coast of Tohoku Earthquake.Earth Plantes Space,2011,63:687-692
4Yoshida Y,Ueno H,Muto D,et al.Source process of the2011off the Pacific coast of Tohoku Earthquake with the combination of teleseismic and strong motion data.Earth Plantes Space,2011,63:565-569
5Yoshida K,Miyakoshi K,Irikura K.Source process of the2011off the Pacific coast of Tohoku Earthquake inferred from waveform inversion with long-period strong-motion records.Earth Plantes Space,2011,63:577-582
6Suzuki W,Aoi S,Sekiguchi H,et al.Rupture process of the2011Tohoku-Oki mega-thrust earthquake(M9.0)inverted from strong-motion data.Geophys Res Lett,2011,38:L00G16,doi:10.1029/2011GL049136
7Yagi Y,Fukahata Y.Rupture process of the2011Tohoku-oki earthquake and absolute elastic strain release.Geophys Res Lett,2011,38:L19307,doi:10.1029/2011GL048701
8Simons M,Minson S E,Sladen A,et al.The2011Magnitude9.0Tohoku-Oki earthquake:Mosaicking the megathrust from seconds to centuries.Science,332:1421-1425
9Hao J L,Wang W M,Yao Z X.Source process of the2011Mw9.0Tohoku Japan earthquake.Sci China Earth Sci,2011,54:1105-1109
10Ozawa S,Nishinura T,Suito H,et al.Coseismic and postseismic slip of the2011magnitude-9Tohoku-Oki earthquake,Nature,475:373-376
11刁法启,熊熊,倪四道,等.利用GPS位移反演日本Mw9.0仙台地震及Mw7.9强余震静态位错模型.科学通报,2011,56:1999-2005
12Sato M T,Ishikawa N,Ujihara S,et al.Displacement Above the Hypocenter of the2011Tohoku-Oki Earthquake,Science,2011,332:1395
13Miura S,Takahashi N,Nakanishi A,et al.Structural characteristics off Miyagi forearc region,the Japan Trench seismogenic zone,deduced from a wide-angle and refraction study.Tectonophysics,2005,407:165-188
14Huang Z,Zhao D,Wang L.Seismic heterogeneity and anisotropy of the honshu arc from the Japan trench to the Sea of Japan.Geophys J Int,2011,184:1428-1444
15Wang L,Wang R,Roth F,et al.After-slip and viscoelastic relaxation following the1999M7.4ízmit earthquake,from GPS measurements.Geophys J Int,2009,178:1220-1237
16Mooney W D,Laske G,Masters T G.CRUST5.1:A global crustal model at5°×5°.J Geophys Res,1998,103:727-747
17Hashimoto C,Noda A,Sagiya T,et al.Interplate seismogenic zones along the Kuril-Japan trench inferred from GPS data inversion.Nat Geosci,2009,2:141-144
18Loveless J P,Meade B J.Geodetic imaging of plate motions,slip rates,and partitioning of deformation in Japan.J Geophys Res,2010,115:B02410,doi:10.1029/2008JB006248
19Pollitz F F,Brooks B,Tong X,et al.Coseismic slip distribution of the February27,2010Mw8.8Maule,Chile earthquake.Geophys Res Lett,38:L09309,doi:10.1029/2011GL047065
20Mendoza C,Hartzell S H.Aftershock patterns and main shock faulting.Bull Seismal Soc Am,1988,78:1438-1449
21Pollitz F F,Bürgmann R,Banerjee P.Geodetic slip model of the2011M9.0Tohoku earthquake.Geophys Res Lett,2011,38:L00G08,doi:10.1029/2011GL048632
22Ito T,Ozawa K,Watanabe T,et al.Slip distribution of the2011off the Pacific coast of Tohoku Earthquake inferred from geodetic data.Earth Planets Space,2011,63:627-630
23Wessel P,Smith W H F.Free software helps map and display data.Eos Trans Am Geoph,1991,72:445-446
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