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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.
The static dislocation model of Tokushima Mw9.0 Tokohu earthquake is retrieved by using layered media model, combined with terrestrial GPS data and seabed GPS / Acoustic data.In the inversion, a more realistic fault geometry is introduced based on prior information, The results show that the seismic moment is 3.68 × 1022Nm, the corresponding moment magnitude is 9.01 and the maximum coseismic slippage is about 45.8m. The faults are mainly distributed in the range of about 240km extending from 39.6 ° N to 36.97 ° N and most of them are in the shallow part of the fault less than 40km.The testing results of the test board show that compared with the case of using GPS data only on the land, Which can better discern the dislocation distribution of faults and the joint inversion results more truly reflect the fault rupture.