IntroductionTheEastChinaSea(ECS)regionisapartoftheoff-shorecontinentalshelfregionintheeasternpartofChina.AlthoughmiddleandstrongearthquakesoccurfrequentlytoitssoutheastintheregionofOkinawatroughandRyukyuislandarc,andevenmorefrequentlytoitssouthinTaiw...