Latest project
Project | 01
Project | 01 Earth structure
We are actively investigating the multi-scale structures of the Earth's interior at all depths, including elastic and anelastic properties of the anomalies from the crust to the core. Various topics are currently processing :
1. Globally Investigating the lower mantle and D" structures using state-of-the-art methods.
2. Mapping the potential magma chamber beneath Tatun volcano in northern Taiwan.
3. Investigating frequency-dependent attenuation structures in northern Taiwan.
4. Waveform modeling of fine-scale structures within the slab.
Project | 02
Project | 02 full-waveform inversion
Tomographic images from full-waveform approaches are starting to reveal fine details of Earth structures. However, the constructions of mesh and kernels for broadband waveforms based on full numerical methods are still computationally expensive, and choices of initial models are critical. We are currently developing a new full-waveform inversion technique based on the asymptotic approach, which is much faster than the full numerical methods.
Project | 03
Project | 03 Earthquake physics
It is always a challenge to robustly determine the source parameters, i.e., stress drop and corner frequency, due to the tradeoff between the path and source effects in the spectral fitting. We have developed the cluster event method (CEM) which can largely reduce the number of the model parameters in the inversion. The method now is well-established and can be used in various regions. Related works: Ko et al., 2012a,b; Ko and Kuo, 2016