By The Nation
About 15-20 per cent of the island was sheared off when storm Noul and the southern monsoon brought heavy rain and strong waves to the area over the weekend.
Park chief Piya Nunil said Hin Tak island probably cracked apart when rainwater dissolved the limestone rock, causing it to rupture.
The park covers 102 square kilometres and 42 limestone-karst islands in the Gulf of Thailand.
Park staff have been ordered to monitor the situation as more land slips may occur. They are also checking the scale of the damage in the affected area. Park residents and fishermen have been told to keep away from coastal areas at danger of storm damage.