My project is funded by the European Commission, project SLATE (Submarine landslides and their impact on European continental margins). Topic: Quantitative Geotechnical Characterization of Seismic Strengthening Effect on Subaquatic Slope Stability
This project consists of a laboratory based, generic study that aims at quantifying the strengthening effect of earthquake loading on marine slope sediment deposits. The seismic strengthening process involves gradual densification of sediment caused by repeated earthquake events that dewater the sediment (also called: dynamic compaction, as opposed to liquefaction in case the shaking is more intense so that excess pore pressure destructs the sediment fabric and bonding forces between particles). By using a dynamic triaxial system at the MARUM with frequencies up to 50 Hz, the increase in undrained shear strength as a function of dynamic loading and pore water drainage can be measured, which sheds light on the stability of the studied slope as a result. The main goal is to explore the nature and significance of seismic strengthening in sediments of different mineralogical and grain size compositions. Expected scientific outcome is to enhance our understanding of:
- Seismic strengthening of granular material and its dependence on parameters such as the seismic intensity, number of seismic events and overburden stresses.
- Seismic strengthening of geotechnically more complex types of soils, for example silts, clays, sand-silt-clay mixtures, tephra, and diatom ooze.
- Case study on natural samples incorporating real earthquake signals.
2017 - present
PhD student at the MARUM, University of Bremen, Germany
2016 - 2017
Research assistant at the Institute of Earth Sciences, Academia Sinica, Taiwan
2014 - 2016
Master of Science (M.Sc.), Marine Geophysics, 1/12, University of Western Brittany (Brest), France
2010 - 2014
Bachelor of Science (B.Sc.), Earth Sciences, 8/50, National Central University, Taiwan
2012 - 2013 and 2016
Guest student to M. Sc. Marine Geosciences, University of Bremen, Germany
Expedition and Training
ECORD Training Course
Bremen MARUM (IODP virtual ship experience)
23 April - 27 April 2018
Nice Aiport landslide area
Ports: Catania - Málaga
25 May - 10 June 2016
Native: Taiwanese Mandarin, Taiwanese Hokkien
High (C2): American English
High-intermediate (N2): Japanese
Intermediate (B1): German, French
Roesner, A., Wiemer, G., Kreiter, S., Wenau, S., Wu, T.-W., Courboulex, F., Spiess, V., and Kopf, A., Impact of seismicity on Nice slope stability—Ligurian Basin, SE France: a geotechnical revisit. Landslides 13, p. 119. DOI: 10.1007/s10346-018-1060-7.
(Submitted to SCI journal) Wu, T.-W., Chi, W.-C., Lin, Y.-S., and Chen, S.-C., Temperature as a Tracer for Fluid Movement at Hydrothermal Sites Near the Yonaguni Knoll IV, Okinawa Trough.
Chi, W.-C., Lee, S.-Y., Lin, Y.-S., Chen, W.-J, and Wu, T.-W., Geological Investigation of Mineral Resource Potential in the Offshore Area of Northeastern Taiwan: Seismic and Heat Flow Surveys (2/4): Fluid Migration Model. Central Geological Survey report No. 106-12-C, 49 pp, Taipei. Originally written in Chinese with English abstract.
Kopf, A., Fleischmann, T., Gauchery, T., Meinecke, G., Renken, J., Spiesecke, U., Stange, N., Völker, D., von Wahl, T., Wenau, S., Wittauer, C., and Wu, T.-W., Report and preliminary results of R/V Poseidon cruise Pos500 “LISA”: Ligurian Slope AUV mapping, gravity coring and seismic reflection. Berichte aus dem MARUM und Fachbereich Geowissenschaften der Univ. Bremen, No. 312, 62 pp. (ISSN 2195-9633)