4.A large earthquake of M 7.3 took place on September 21, 1999 at Chi Chi of Western Foothill, central Taiwan region. It caused severe damage and a great number of casualties that had gone beyond the destruction and casualty caused by any one of the historical earthquakes in the past 20 th century in Taiwan region. The magnitude of the earthquake is also the largest one of the shocks occurred in the inland of Taiwan Island.
1999年9月21日,台湾中部山麓带发生了M7.3的大地震,震源深度为8km,财产损失及人员伤亡是百年来台湾许多地震中损失及伤亡最大的1次,其震级也是台湾本岛陆上所发生的地震级别最大的。