HR: 11:35h
AN: T32B-06 INVITED     [Abstracts]
TI: Airborne laser swath mapping of the metropolitan Taipei area
AU: * Chan, Y
EM: yuchang@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, Taipei, 115 Taiwan
AU: Lee, J
EM: jclee@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, Taipei, 115 Taiwan
AU: Chen, R
EM: roufei@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, Taipei, 115 Taiwan
AU: Liu, J
EM: JKLiu@itri.org.tw
AF: Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310 Taiwan
AU: Hsu, W
EM: ianhsu@itri.org.tw
AF: Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310 Taiwan
AU: Hu, J
EM: jchu@ntu.edu.tw
AF: Dept. of Geosciences, National Taiwan University, Taipei, 106 Taiwan
AU: Chen, W
EM: wenshan@ntu.edu.tw
AF: Dept. of Geosciences, National Taiwan University, Taipei, 106 Taiwan
AU: Chen, Y
EM: ygchen@ntu.edu.tw
AF: Dept. of Geosciences, National Taiwan University, Taipei, 106 Taiwan
AU: Cheng, D
EM: dyj@chsurvey.com.tw
AF: Chung-Hsin Survey Company, 159 Chungren St., Taichung, 403 Taiwan
AU: Tsao, S
EM: tsaosj@moeacgs.gov.tw
AF: Central Geological Survey, Ministry of Economic affairs, Taipei, 235 Taiwan
AB: Surface faulting commonly occurred in the tectonically active Taiwan region. Investigating and characterizing crustal surface faults become urgent because damaging earthquakes usually resulted from crustal surface faulting. In recent years, remote sensing technology has provided mapping tools that can pinpoint active structures more accurately. Among the mapping tools, airborne laser swath mapping, also known as airborne LIDAR (Light Detection and Ranging), has received much attention for its ability of collecting reliable and high-density elevation data. Also among its practical ability are filtering tree tops and buildings to provide earth ground models. Such digital elevation models are invaluable for better characterizing and evaluating urban crustal faulting and tectonic activities. Because of earthquake threats for the metropolitan Taipei area, we have organized a mapping and research team which uses airborne LIDAR to produce meter-resolution digital elevation models. These derived LIDAR models will subject to field verification and then be applied for active fault and geologic hazards research. In the Taipei region, two major earthquake sources were previously recognized as the Chinshan fault and the Sanchiao fault. The Chinshan fault is considered as a frontal thrust fault during the earlier episode of the Taiwan mountain collision. Around 0.5 Ma the stress field of northern Taiwan gradually turned into regional extension, normal faulting started to dominate the Taipei area. The Sanchiao fault, a normal fault, is a product of the crustal extension which contributes to the formation of the Taipei basin. However, the precise locations and the northern extension of the Sanchiao fault are still unclear and debatable. It is hoped that the LIDAR mapping project can unveil urban surface faults in a precise manner. We expect the project will produce reliable and high-precision digital elevation models for applications including evaluating tectonic and volcanic geomorphology in the populated metropolitan Taipei area. We have started reevaluating fault traces of active faults and will show preliminary results of the surficial expression of the Sanchiao fault as well as the Chinshan fault in the metropolitan Taipei area.
DE: 8002 Continental neotectonics (8107)
DE: 8107 Continental neotectonics (8002)
SC: Tectonophysics [T]
MN: Fall Meeting 2005