摘要
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.