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A dense GPS observation immediately after the 2004 mid-Niigata prefecture earthquake

机译：2004年新泻县中地震后立即进行的密集GPS观测

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To investigate the postseismic crustal deformation associated with the 2004 mid-Niigata prefecture earthquake (M6.8), we newly started GPS observation to fill a gap of the nationwide continuous GPS network. Our GPS sites were mainly distributed in the focal region without permanent GPS site, and succeeded in obtaining the postseismic deformation. Coseismic displacements of two aftershocks were clearly detected because of immediate observation. Estimated fault parameters of the aftershock (M5.9) on November 8 occurring just beneath our GPS network indicated that geodetic data could be explained by either east- or west-dipping fault model inferred from detailed aftershock data. Moreover, clear postseismic deformation, which could be characterized by a logarithmic decay function, was observed. This signal probably suggests possible aseismic slip. Our results indicated that dense GPS observation could give important and interesting data to clarify the properties of shallow inland middle-size earthquakes.
机译：为了调查与2004年新泻县中部地震（M6.8）有关的地震后地壳变形，我们新近启动了GPS观测，以填补全国连续GPS网络的空白。我们的GPS站点主要分布在震源区，没有永久的GPS站点，并成功获得了地震后的变形。由于立即观察，清楚地发现了两个余震的同震位移。估计在11月8日发生在我们GPS网络正下方的余震（M5.9）的断层参数表明，大地数据可以用从详细余震数据推断出的东西向断层模型来解释。此外，观察到明显的地震后变形，其特征可以是对数衰减函数。该信号可能表明可能存在抗震滑动。我们的结果表明，密集的GPS观测可以提供重要而有趣的数据，以阐明浅层内陆中型地震的性质。

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