Crustal deformation and block kinematics in transition from collision to ...

4 downloads 0 Views 1MB Size Report
collision to subduction: Global positioning system measurements in northern Taiwan, 1995–2005, J. ...... and interseismic coupling on faults [e.g., Savage, 1983]. In ..... Timothy Dixon and two reviewers, Rob McCaffrey and David Wiltschko,.
Click Here

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 113, B09404, doi:10.1029/2007JB005414, 2008

for

Full Article

Crustal deformation and block kinematics in transition from collision to subduction: Global positioning system measurements in northern Taiwan, 1995–2005 Ruey-Juin Rau,1,2 Kuo-En Ching,1 Jyr-Ching Hu,3 and Jian-Cheng Lee4 Received 1 October 2007; revised 1 June 2008; accepted 26 June 2008; published 9 September 2008.

[1] We present global positioning system (GPS) measurements for the period 1995–2005 at

125 campaign-surveyed sites in northern Taiwan. Based on elastic, rotating block modeling analyses derived from the GPS data, we describe the transitional tectonics from arc– continent (Luzon–Chinese) collision to the converging Ryukyu trench subduction and back-arc opening along the Chinese continental margin. Station velocities relative to station S01R, in the Chinese stable continental margin, were estimated from coordinate time series of each station by using the weighted least squares technique. We found two distinct deformation patterns in two geological areas, which are basically separated by the surface projection of the NW-trending boundary of the subducting Philippine Sea plate across northern Taiwan: (1) a waning collision area to the west and (2) a transition zone to the east. In the waning collision area, the horizontal velocity field shows vectors of 0.3–7.3 mm/yr toward the NW in the foothills and the Hsuehshan Range of northwestern Taiwan. The tectonic blocks represent a significant NW–SE internal contraction along with a small block rotation rate (

Suggest Documents