Presenter: Yi-Ming Shie
Date: 2016/12/08
Abstract
The earthquakes of November 1951 constitute the most destructive seismic episode in the recorded history of the Longitudinal Valley,eastern Taiwan. However, information about their source parameters is sparse. To understand the relationship between the 1951 ruptures and new interpretations of the regional neotectonic architecture of the Longitudinal Valley, we re-evaluated the November 1951 ruptures by analyzing old documents, photographs, gps, seismicity and by interviewing local residents who experienced the earthquake. As a result, we have revised significantly the rupture map previously published. We divide the surface ruptures from south to north into the Chihshang, Yuli, and Rueisuei sections. The Chihshang and Rueisuei ruptures are along segments of the Longitudinal Valley fault, a left-lateral oblique fault along which the Coastal Range thrusts westward over the Longitudinal Valley. The Yuli rupture, on the other hand, appears to be part of a separate, leftlateral strike-slip Yuli fault, which traverses the middle of the Longitudinal Valley.
Reference
Chung, L. H., Chen, Y. G., Wu, Y. M., Shyu, J. B. H., Kuo, Y. T., Lin, Y. N. N., 2008. Seismogenic faults along the major suture of the plate boundary deduced by dislocation modeling of coseismic displacements of the 1951 M7. 3 Hualien–Taitung earthquake sequence in eastern Taiwan. Earth and Planetary Science Letters, 269(3), 416-426.
Shyu, J. B. H., Chung, L. H., Chen, Y. G., Lee, J. C., & Sieh, K., 2007. Re-evaluation of the surface ruptures of the November 1951 earthquake series in eastern Taiwan, and its neotectonic implications. Journal of Asian Earth Sciences, 31(3), 317-331.