Many islands are scattered around the southern area of the Korean Peninsula and they may be very vulnerable to unexpected tsunami
attacks. During the East Japan Tsunami Event occurred on March 11, 2011, many islands located at the southern area were affected by
tsunamis. In this study, maximum run-up heights of solitary waves on a circular island with asymmetrical crest lengths investigated by
using a numerical model based on the shallow-water theory. The obtained results could be used by local authorities to establish a defense
plan against unexpected tsunami invasion.