Once the volcanoes of northern Snow Mountains
erupted, the magma upwelled to heat the water of the natural underground
reservoirs, and then raised the water pressure and triggered the collapse,
which created a big landslide. The chain effect took place; whole an enormous
volume of earth rolled and fell that made the smooth coastline to form the
beautiful concave arc.
From the east flank of Snow Mountains to the
original coastline of Ilan, the area is about 800 km2. After volcano
erupted and collapsed that lowered the average elevation about 600 m;
therefore, estimating the volume of earth about 480 km3 dropped
into the Pacific Ocean that caused a mega-tsunami.
The
original coastline of northeast corner of Taiwan was pushed and raised by
Eurasia plate and Philippine marine plate. So, it should spread from the coast
of Hua-Tung straightly, through the east of Turtle Island, until reaches
Santiago, and presents with the precipitous rocky coast.
摘錄自何顯榮教授《認識台灣古文明》
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