台灣大學 National Taiwan University

地球物理分析實驗室 Geophysical Analysis Lab, GAL

Emmy T. Chang
https://geophysical-analysis-lab4.webnode.tw/

Research Field

Earth Science

Introduction

Emmy T. Chang is a faculty member in Marine Geology and Geophysics at the Institute of Oceanography, National Taiwan University, where she conducts research in seafloor seismology. 

She received her Ph.D. in Geodynamics from Université Pierre & Marie Curie in France and has held visiting and research positions at JAMSTEC, Kyoto University, IFREMER, and Université Grenoble Alpes. Her research focuses on seafloor seismology, offshore tectonics, and lithospheric deformation in subduction and collision zones, using ocean-bottom seismometers, marine gravity, numerical modeling, and machine-learning approaches. She is actively involved in international marine experiments and currently collaborates with partners in Japan, Europe, and the United States.

The Geophysics Analysis Lab (GAL) is a research group led by Emmy Chang. The lab focuses on seafloor geophysics and seismology, integrating observations from ocean-bottom seismometers, marine geodesy, gravity data, and satellite products to investigate offshore tectonics and subduction-zone processes. Through international collaborations and participation in large-scale marine experiments, GAL aims to advance the understanding of Earth processes beneath the oceans and their links to plate convergence and natural hazards.


Research Topics

 

1. Seafloor Seismology

  * T-phase wave characteristics revealed by OBS arrays
  * Ambient-noise sources and nonlinear interactions between ocean currents and seafloor topography
  * Surface-wave tomography in offshore tectonic convergence zones

2. Lithospheric Deformation and Plate Convergence

  * Ground deformation from geodetic observations (cGPS, tide gauges, seafloor geodesy)
  * Shear-wave splitting and seismic anisotropy
  * Numerical modeling of lithospheric deformation processes

3. Subduction-Zone Seismotectonics and Seismic Sources

  * Seismic tomography using local earthquakes (onshore and OBS data)
  * Detection and characterization of offshore seismicity using OBS
  * Focal-mechanism solutions based on near-field waveform simulations
  * Tsunami waveform simulations using NOAA/DART observations
  * Surface-wave tomography

4. Seafloor Gravity and Integrated Tectonic Imaging

  * Marine gravity compilation from satellite altimetry and shipborne/airborne surveys
  * Tectonic interpretation and inversion using joint gravity and seismic velocity models

5. Machine-Learning Applications in Geosciences

  * Pattern recognition and signal detection in seismic and geophysical datasets
  * Automated analysis of large-scale marine and OBS observations

 


Honor

2009, 2013, 2023  College of Science, National Taiwan University Teaching Award
2025   Best Reviewer Award, TAO (2022 - 2024)
 


Educational Background

2002  PhD     Lab. Geodynamiques, Université Pierre & Marie Curie (Paris VI), France
1996  M.S     Institute of Oceanography, National Taiwan University
1993  B.S    Department of Geology, National Taiwan University