The 21 September, 1999 Chi-Chi Earthquake in Taiwan: Implications for Tsunami Earthquakes


The 1999 Chi-Chi earthquake in Taiwan can be regarded as a subduction zone earthquake in a tectonic sense. It was associated with an abnormally uplifted area in the northwestern corner of the earthquake fault. The area is in the river bed where the Ta-Chia River runs from east to west. The large horizontal movement of the basement south of the river to the north could have produced the multiple thrusts and the abnormal uplifts amounting to 3-6 m due to the shortening of the accretionary prism.

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