摘要: interest is to make clear the occurring mechanism of the init(?) (?)ion on the limestone terrain I have been investigating (?) (?)ssions on several islands over the Ryukyu islands under the hum(?) (?) zone.The Ryukyus are composod of more than 70 isiands with (?) (?) reef limestone There are geomor(?)hological feature of var karstic initial depressions on each isiand affeeted by diff(?) crustal movement with (?)eated aplifted dro(?)ed and