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The 1999 Chi-Chi earthquake in Taiwan can be regarded as a subduc­ tion zone earthquake in a tectonic sense. It was associated with an abnor­ mally 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. These inelastic uplifts would imply an abnormal tsunami if the area were under the sea, thus suggesting a new factor for the mechanism of tsu nami earthquakes, which is an .uplift of the sediment or weak accretionary prism caused by a sudden horizontal movement on the decollement be­ neath the lowermost .inner trench slope like sand being pushed up by a bulldozer. This is consistent with the features of tsunami earthquakes hav­ ing the low dip angle thrust extending to the trench. (

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