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通过反演研究2008年日本岩手—宫城内陆地震(M～6.9),说明了用1Hz全球定位系统(GPS)观测数据推导中强震(M6级)震源过程的能力。比较了此次地震采样率为1Hz的GPS观测波形,发现与强震仪记录波形有很好的一致性。由于震源区及其周围有足够多的GPS台站很好地记录到了地面运动,因而使我们仅仅采用1Hz的GPS观测数据就可进行波形反演。反演的结果与大地测量和强震仪数据联合反演的结果相当一致,如地震矩(Mw～6.9)、累积滑动量分布和破裂传播等。这种一致性证明,采样率为1Hz的GPS观测数据不仅能用来推导M6级中强震破裂过程的动态特征,而且能用来推导其持久(或静态)的滑动。
The inversion of the Iwate-Miyagi inland earthquake (M ~ 6.9) in Japan in 2008 illustrates the ability to derive M6-level hypocenters from 1Hz global positioning system (GPS) observations. Compared with the GPS observation waveform with the seismic sampling rate of 1 Hz, it is found that there is a good consistency with the recorded waveform of the strong earthquakes. Since there are enough GPS stations in and around the source area to record ground motion well, we can perform waveform inversion using just 1 Hz GPS observations. The inversion results are in good agreement with the results obtained from the joint inversion of geodetic and seismograph data, such as the seismic moment (Mw ~ 6.9), the cumulative slip distribution, and the propagation of fractures. This consistency proves that GPS observation data with a sampling rate of 1 Hz can not only be used to derive the dynamic characteristics of the M6 medium-strong earthquake rupture process, but also to derive its persistent (or static) slip.