The Submarine Topographic Lineaments off Northern Taiwan
Speaker: Chung-Hui, Fang
Abstract
Based on bathymetric data collected in recent years, the topographic features and their structural implications in the offshore area of northern Taiwan are described in this study. The northern Taiwan coast includes the Chilung shelf, the Chilung Valley, the Mien-Hua Cayon, and the Northern Mien-Hua Cayon. The Chilung Sea Valley lies parallel to the coastline of northern Taiwan. It connects the coastal area to the Chilung Shelf through a descending rugged surface. This valley is about 65 km long, 7ˇV15 km width. On the Chilung Shelf, a series of topographical lineaments extends from onland Taiwan and are in the NE-SW orientation presently. The faults extend from land is discontinuous. It suggested that they are right strikeˇVslip faults. These right-lateral strikeˇVslip faults are suggested to result from a compressive shearing under the orogeny of the convergence between the Philippine Sea plate and the Eurasian plate. Based on seismic profiles, flower structure are clearly observed. It indicates there is a factor of normal faulting mechanics. It might indicate some different tectonic stress in Northern Taiwan.
Reference
Gow-Shyh Song, Chung-Ping Ma and Ho-Shing Yu,2000. Fault-controlled genesis of the Chilung Sea Valley (northern Taiwan) revealed by topographic lineaments. Marine Geology 169 (2000) 305ˇV325.
Gwo-Shyh Song, Yet-Chung Chang and Chung-Ping Ma,1997. Characteristics of Submarine Topography off Northern Taiwan. Terrestrial, Atmospheric and Oceanic Sciences Vol. 8, No. 4,461-480,December 1997.