wave energy is sufficiently large. For instance, oscillatory changes
of the groundwater level were observed in Taiwan as a response
to the M8.7 2004 Sumatra earthquake, whose epicenter was about
3000 km away from Taiwan (TWRA, 2005). Several earthquake
events with an epicentral distance farther than 1000 km led to
oscillatory changes in Taiwan (TWRA, 2005)