Towards an extensible local magnitude scale
Abstract/Contents
- Abstract
- A consistent earthquake catalog containing homogeneous event size estimates is very crucial for many applications, including determination of long-term seismic activity rates, estimation of average site conditions, and most importantly, for seismic hazard assessment. The local magnitude, ML, is one of the most widely-used magnitudes for local and small earthquakes. However, ML as it was originally dened by Richter can be very biased due its arbitrary anchor at 100 km, and the fact that Richter derived it specifically for southern California. This thesis aims to redefine the local magnitude scale in a more intentional and physical way, as Richter had intended it to be. The primary purpose for chapter 2 is to introduce a physically-meaningful, data-driven approach to calibrate the local magnitude scale. We apply this approach to southern Kansas, Texas, Oklahoma and southern California. In chapter 3, we develop a model-driven approach to calibrate ML where earthquake data is scarce or unavailable. This approach utilizes information about the crustal structure and gives results that are consistent with the empirical approach. In chapter 4, we investigate the relationship between ML and seismic moment, M0, and use time-domain measurements of the maximum displacement amplitude, filtered using seven one-octave band-pass filters, to analyze the frequency content of S-wave and gain knowledge about the regional wave propagation characteristics as well as source parameters. The last chapter discusses the secondary project, in which we perform ultrasonic velocity experiments on Utica shale samples in order to characterize their anisotropy, and to estimate their dynamic elastic parameters. It is an attempt to better understand the in-situ behavior of the rock.
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 | 2020; ©2020 |
| Publication date | 2020; 2020 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Al-Ismail, Fatimah Mohammad |
|---|---|
| Degree supervisor | Beroza, Gregory C. (Gregory Christian) |
| Thesis advisor | Beroza, Gregory C. (Gregory Christian) |
| Thesis advisor | Ellsworth, William L |
| Thesis advisor | Zoback, Mark D |
| Degree committee member | Ellsworth, William L |
| Degree committee member | Zoback, Mark D |
| Associated with | Stanford University, Department of Geophysics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Fatimah Al-Ismail. |
|---|---|
| Note | Submitted to the Department of Geophysics. |
| Thesis | Thesis Ph.D. Stanford University 2020. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2020 by Fatimah Mohammad Al-Ismail
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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