Friday, October 26, 2018

Research interests

I was trained as a sedimentologist and have been working on the paleoseismology field since 1999, the destructive Chi-Chi earthquake. For my earlier project in Taipei basin, we identified the Holocene activity of the Shanchiao Fault by establishing the stratigraphy of the drill holes and proposed the potential scenarios of seismic hazards to the metropolitan Taipei area. Later, I had the chance to work on the Tibetan Plateau and look into the detrital records that unveil intricate surface processes. Therein I initiated projects regarding river sediments along the Yarlung-Tsangpo, southern Tibet, to discuss 1) the glacially dammed lakes upstream of the Yarlung-Tsangpo Gorge; 2) the modern exhumation patterns of the Lhasa Terrane across the Nyainqentanghla Shear zone. Recently, I got involved in the work of risk assessments on extreme wave events along the coast of east Taiwan, where typhoon and tsunami are both potential candidates of shoreline inundation.

Research Projects 

ü   Paleoseismology study – Borehole correlations of fluvial to estuary sediments were conducted between pairs of drill holes in Taipei Basin, Taiwan. The boreholes were drilled across the major normal fault, Sanchiao Fault, which situates along the western boundary of the Taipei metropolitan area. With the occurrence of growth strata, we have identified Holocene activities of the Sanchiao Fault with good estimates of co-seismic offsets. (Details here)

ü   Glacially dammed Lake – Stratigraphy of lacustrine sediments and terrace fills documents the evolution of the glacial-related delta found in the tributary of Yarlung-Tsangpo, the great river of Tibet. The lacustrine sections represent a high-water-level stage when the Yarlung-Tsangpo was impeded by the advanced mountain glacier during late Pleistocene. (Details here)

 ü   Multi-thermochronology on detrital material – Multiple thermochronometers were applied to detrital samples from the tributaries of Yarlung-Tsangpo. Comparisons of age populations between different catchments and up-/down-stream samples reveal a focused denudation pattern within the Lhasa River catchment, particularly along the Yadong-Gulu (亞東-古露) Rifting belt. (Details here)

ü   Extreme wave events along the coast of east Taiwan – Exposed outcrops of modern marine terraces present plausible extreme wave records. Sedimentary features in conjunction with topographic survey suggest the occurrence of paleo-tsunami events at some sites along the east Taiwan.

 ü   Impacts of (extreme) storm surges to the coastal environment, east Taiwan – The severe damage resulted from typhoon Soudelor (蘇迪勒), Aug 2015, has brought up our attention toward the impact of storm surges to the east coast of Taiwan. My current investigation focus on the inundation limit, beach profile, and clast size distribution of storm-related deposits. We are in hopes of establishing a comprehensive index system in a near future to describe and estimate the impact of typhoon surges and applying that to the justification of tsunami deposits. (Details here)

ü  On 6 February 2018, a ML 6.2 earthquake struck the east coast of Taiwan and caused more than 200 casualties in the Hualien area. The mainshock initiated at a shallow depth of 6.3 km and was accompanied by numbers of foreshocks and aftershocks. We investigated the coseismic ruptures along the Milun Fault. Overall, the distinct features of the coseismic ruptures reflect the complex near-surface geology along the Milun Fault and offer new insights for future hazard assessments of the Hualien area. (Details here)

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