【摘要】 利用自动经验基线校正方法,分析日本2008年岩手—宫城内陆Mw6.9地震震中周围密集强震动观测台网资料,快速解算出了同震位移场分布,并据此反演了震源滑动模型.经与GPS结果比较,两种不同方法给出的同震位移幅值、方向和总体分布特征较为接近.基于相同断层面参数反演的震源模型空间展布形态、主要滑动范围、平均和最大滑动量、滑动方向以及由模型计算的矩震级等均吻合较好,从而验证了方法的可行性.讨论了自动经验基线校正方法尚存在的问题和不足,为今后利用强震资料快速解算Mw6-7级及以上地震的同震位移场并反演震源滑动分布提供参考.更多还原

【Abstract】 Near-source co-seismic displacement field of the 2008 Mw6.9 Iwate-Miyagi Nairiku(Japan) earthquake is estimated from digital strong-motion records after correction for their baseline errors using an improved empirical method and compared with the GPS observations.Furthermore,different slip models of the earthquake are inverted from the GPS and strong-motion based displacement data separately and jointly,which are in good agreement.Based on these results,we conclude that using a dense strong-motion network,near real-time recovery of co-seismic displacement of large earthquakes is feasible and therefore useful in context of seismic early warning and rapid response systems.Finally,we discuss the minimum requirements on the strong-motion data that ensure a reliable recovery of the co-seismic displacement.更多还原