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Wang, Jeen-Hwa

王錦華 Wang, Jeen-Hwa

Adjunct Research Fellows
Research Fields:Earthquake Physics

Research interest

2015 MOST project:
Project: Modeling of Nucleation and Rupture Propagation of Earthquakes (I)
Abstract: The rupture processes of earthquakes essentially consist of three steps: nucleation (or initiation), rupture propagation, and arrest. It is necessary to study the mechanisms controlling the whole rupture processes. Such processes are very complicated, and cannot be completely solved just using a simple model. A minimal set of ingredients of an ideal model must include plate tectonics, brittle-ductile fracture rheology, re-distribution of stresses after fracture, friction, the geometry of faults, the healing process from dynamic to static friction after a fault stops moving, pore fluid pressure, thermal effect, and stress corrosion. In the study, I will take three physical models into account. The first one is the 1-D dynamical spring-slider model (denoted by the 1-D BK model hereafter) proposed by Burridge and Knopoff (1967), the second one is the one-body spring-slider model, and the third one is the two-body spring slider model. The three models will be called the dynamical spring-slider models hereafter. For the purpose of comparison, the dislocation model will also be used in this study. For each model, the friction force will be three types: velocity- dependent friction, rate- and state-dependent friction, and thermal pressurized friction. In coming two years, I will focus on nucleation of an earthquake. Of course, I will also study the rupture propagation of an earthquake. Analytical approach and numerical simulations for nucleation and rupture propagation will be performed.

2016 MOST project:
Project: Modeling of Nucleation and Rupture Propagation of Earthquakes (II)
Abstract: The rupture processes of earthquakes essentially consist of three steps: nucleation (or initiation), rupture propagation, and arrest. It is necessary to study the mechanisms controlling the whole rupture processes. Such processes are very complicated, and cannot be completely solved just using a simple model. A minimal set of ingredients of an ideal model must include plate tectonics, brittle-ductile fracture rheology, re-distribution of stresses after fracture, friction, the geometry of faults, the healing process from dynamic to static friction after a fault stops moving, pore fluid pressure, thermal effect, and stress corrosion. In the study, I will take three physical models into account. The first one is the 1-D dynamical spring-slider model (denoted by the 1-D BK model hereafter) proposed by Burridge and Knopoff (1967), the second one is the one-body spring-slider model, and the third one is the two-body spring slider model. The three models will be called the dynamical spring-slider models hereafter. For the purpose of comparison, the dislocation model will also be used in this study. For each model, the friction force will be three types: velocity- dependent friction, rate- and state-dependent friction, and thermal pressurized friction. In coming two years, I will focus on nucleation of an earthquake. Of course, I will also study the rupture propagation of an earthquake. Analytical approach and numerical simulations for nucleation and rupture propagation will be performed.

2017 MOST project:
Project: Modeling of Nucleation and Rupture Propagation of Earthquakes (III)
Abstract: The rupture processes of earthquakes essentially consist of three steps: nucleation (or initiation), rupture propagation, and arrest. It is necessary to study the mechanisms controlling the whole rupture processes. Such processes are very complicated, and cannot be completely solved just using a simple model. A minimal set of ingredients of an ideal model must include plate tectonics, brittle-ductile fracture rheology, re-distribution of stresses after fracture, friction, the geometry of faults, the healing process from dynamic to static friction after a fault stops moving, pore fluid pressure, thermal effect, and stress corrosion. In the study, I will take three physical models into account. The first one is the 1-D dynamical spring-slider model (denoted by the 1-D BK model hereafter) proposed by Burridge and Knopoff (1967), the second one is the one-body spring-slider model, and the third one is the two-body spring slider model. The three models will be called the dynamical spring-slider models hereafter. For the purpose of comparison, the dislocation model will also be used in this study. For each model, the friction force will be three types: velocity- dependent friction, rate- and state-dependent friction, and thermal pressurized friction. In coming two years, I will focus on nucleation of an earthquake. Of course, I will also study the rupture propagation of an earthquake. Analytical approach and numerical simulations for nucleation and rupture propagation will be performed.

2018 MOST project:
Project: Modeling Nucleation and Precursors of Earthquakes based on Thermal- Pressurized Friction, Viscosity, and Mechanochemistry
Abstract: The rupture processes of earthquakes essentially consist of three steps: nucleation (or initiation), rupture propagation, and arrest. In this study, I will focus on nucleation and seismic precursors before and during the nucleation processes. It is necessary to study the mechanisms controlling the processes. Such processes are very complicated, and cannot be completely solved just using a simple model. A minimal set of ingredients of an ideal model must include plate tectonics, brittle-ductile fracture rheology, re-distribution of stresses after fracture, friction, the geometry of faults, the healing process from dynamic to static friction after a fault stops moving, pore fluid pressure, thermal effect, and stress corrosion. In the study, I will take three physical models into account. The first one is the 1-D dynamical spring-slider model (denoted by the 1-D BK model hereafter) proposed by Burridge and Knopoff (1967), the second one is the one-body spring-slider model, and the third one is the dislocation model. For each model, the friction force will be three types: velocity- dependent friction, rate- and state-dependent friction, and thermal pressurized friction. In addition, mechanochemistry will also be taken into account. The main issues to be done in coming three years (August 1, 2018 to July 31, 2021) are: (1) In the first year, a working model for mechanochemisty will be proposed and then this model will be put into the spring-slider or dislocation model in the presence of thermal-pressurized friction and viscosity to form a complete model to represent the mechanism for nucleation and precursor of earthquakes. Preliminary analytical solution and will be performed for studying the intrinsic properties of the model. (2) In the second year, based on the new model the analytical approach and numerical simulation will be performed for studying the possible generation of mechanical chemistry during earthquake nucleation. (3) In the third year, based on the new model analytic approach and numerical simulations will be performed for studying the generation of some seismic precursors.

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