Visiting Researchers
 |
Institute |
Institut de Physique du Globe de Paris, Ecole Normale Supérieure, Paris |
Title |
Post-doctoral Researcher | |
Country |
France | |
Period of Stay |
2018/04/15 - 2018/06/17 | |
Research Theme |
Physics-based models of deep interseismic creep to constrain time-dependent stress-and slip-rate on the Japan trench megathrust | |
Host Researcher |
Junichi FUKUDA |
I am currently a post-doctoral researcher at the Institut de Physique du
Globe de Paris (IPGP) and the Ecole Normale Supérieure (ENS) in Paris,
France. My work aims at better understanding earthquake physics, through
the combination of data analysis and numerical modeling. After an initial
training in France, I went to Stanford University for my PhD, from which
I graduated in December 2017.
In my thesis, supervised by Prof. Paul Segall, I combined physics-based
models of the locked-to-creeping transition region with geodetic inversions
of surface deformations rates to assess the slip and stress behavior of
the down dip edge of the locked region. Most of my work focused on the
Cascadia subduction zone, for which I developed a new method that allows
interseismic slip to penetrate up dip into the locked region (Bruhat &
Segall 2017). This simple model considers deep interseismic slip as a crack
loaded at constant slip rate at the down-dip end. It provides analytical
expressions for stress drop within the crack, slip, and slip rate along
the fault.
During my stay at ERI, I will apply this new class of solution to the Japan
Trench megathrust. Recent studies, such as Mavrommatis et al. (2014), have
reported the existence of decadal-scale transient deformation along the
Japan trench before the Mw 9.0 Tohoku earthquake. We will use this new
method to better constrain the temporal and mechanical characteristics
of this transient.