Fluid-induced seismicity and fully dynamic earthquake rupture in fractured poroelastic media : models, discretization and computation
Abstract/Contents
- Abstract
- This thesis establishes a computational modeling framework for earthquakes induced by anthropogenic fluids. The medium of interest is a fault-hosting porous elastic solid saturated with a single-phase compressible fluid and subjected to external fluid perturbations. The fluid and solid interact in a fully coupled manner (namely poroelastic coupling) to produce changes and drive a source fault through the inter-seismic quasi-static earthquake triggering and toward the subsequent co-seismic dynamic earthquake rupture. In modeling these subprocesses, I first resolve fault-related model additions in the mathematical formulations and then develop accordingly some new discretization and computational procedures for efficiently finding the numerical solutions. Specifically, in Chapter 2, I establish a single-phase, nonlinear, transient, quasi-static and fully coupled poromechanical modeling framework in the presence of an arbitrary network of hydraulically conductive faults. A hybrid-dimensional two-field mixed low-order finite element method is developed for efficient space discretization. Chapters 3 and 4, both drawing inputs from Chapter 2, are dedicated to the modeling of fluid-induced earthquakes. In Chapter 3, I am concerned with the modeling of large numbers of events and the associated source characteristics (seismicity). To do so, I utilize (1) the fracture-poro-mechanical modeling technique from Chapter 2 for the inter-seismic triggering and (2) a physics-based stochastic stress drop modeling technique to statically approximate the co-seismic failure. A new computational procedure is then developed to couple the two and advance them through seismic cycles. In Chapter 4, I focus on a single earthquake event and closely examine the associated co-seismic fully dynamic spontaneous rupture, after first resolving the pre-seismic triggering following Chapter 2. I then address how the fluid effect enters the model formulation and discretization and how it impacts the computational procedures ranging from preconditioner design to solver selection. In each chapter, I also conduct numerical experiments and investigate the effects of faults and/or poroelastic coupling on model responses. This thesis provides new insights into various aspects of fluid-induced earthquakes and the presented computational modeling framework offers a first step toward a more comprehensive and capable tool for modeling this type of seismic event in the future.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Jin, Lei |
|---|---|
| Degree supervisor | Zoback, Mark D |
| Thesis advisor | Zoback, Mark D |
| Thesis advisor | Borja, Ronaldo Israel |
| Thesis advisor | Dunham, Eric |
| Thesis advisor | Sleep, Norman H |
| Degree committee member | Borja, Ronaldo Israel |
| Degree committee member | Dunham, Eric |
| Degree committee member | Sleep, Norman H |
| Associated with | Stanford University, Department of Geophysics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Lei Jin. |
|---|---|
| Note | Submitted to the Department of Geophysics. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Lei Jin
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...