Characteristics of neotectonic deformation in the Tuy Hòa coastal area, Phú Yên
Province and its significance for geological hazards
Bùi Thị Mến, Nguyễn Thị Vân, Mai Văn Cường
The Tuy Hòa area, locates at the eastern margin of the Kon Turn Massif, comprises a variety of sedimentary, volcanic and intrusive rocks formed from Paleozoic to Early Cenozoic. They are largely covered by unconsolidated Neogene I Quaternary sediments. The area has been strongly deformed by numerous tectonic events, the latest one has extended to the present. These tectonic movements include the presence of old and neotectonic fault systems, and terrane depression and elevation with numerous direct or indirect evidences. Intense tectonic activities have not only created various morphology differentiation controlled by basement structure but also various types of geological hazards including landslides and coastal erosion along the Đà Rằng and Bàn Thạch river systems as well as local depression. The areas of strong geological hazards are commonly controlled by neotectonic fault or fracture zones. The existence of neotectonic movements caused exogenetic geohazards. Thus, the idenfication of active tectonic factors and their nature are important for the prediction of and mitigation the effects of geohazards in the Tuy Hòa area, especially in the rising of sea level caused by climate change.
Người biên tập: PGS. TS Trần Thanh Hải.