Work Description

Title: Characterizing Multi-Subevent Earthquakes Using the Brune Source Model Open Access Deposited

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Attribute Value
Methodology
  • The original source time functions are from the SCARDEC catalog, which is available through  http://scardec.projects.sismo.ipgp.fr/. Analysis to the source time function data is done through Python 3.
Description
  • The Brune source model is widely used in studies of complex earthquakes with multiple episodes of high moment release (i.e., multiple subevents). In this study, we investigate how corner frequency estimates of earthquakes with multiple subevents are biased if they are based on the Brune source model. By assuming complex sources as a sum of multiple Brune sources, we analyze 1,640 source time functions (STFs) of Mw 5.5-8.0 earthquakes in the SCARDEC catalog to estimate the corner frequencies, onset times, and seismic moments of subevents. We identify more subevents for strike-slip earthquakes than dip-slip earthquakes, and the number of resolvable subevents increases with magnitude. We find that earthquake corner frequency correlates best with the corner frequency of the subevent with the highest moment release (i.e., the largest subevent). This suggests that, when the Brune model is used, the estimated corner frequency and therefore the stress drop of a complex earthquake is determined primarily by the largest subevent rather than the total rupture area.

  • Our results imply that the stress variation of asperities, rather than the average stress change of the whole fault, contributes to the large variance of stress drop estimates.
Creator
Depositor
  • meichenl@umich.edu
Contact information
Discipline
Funding agency
  • National Science Foundation (NSF)
Date coverage
  • 1992 to 2017
Citations to related material
  • Meichen Liu, Yihe Huang, Jeroen Ritsema. 2021. Characterizing Multi-Subevent Earthquakes Using the Brune Source Model [Preprint]. https://essoar.org (2021) DOI: doi.org/10.1002/essoar.10507564.1
Resource type
Last modified
  • 11/19/2022
Published
  • 07/21/2021
DOI
  • https://doi.org/10.7302/4ga6-8574
License
To Cite this Work:
Liu, M. (2021). Characterizing Multi-Subevent Earthquakes Using the Brune Source Model [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/4ga6-8574

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Files (Count: 6; Size: 27.1 MB)

Thumbnailthumbnail-column Title Original Upload Last Modified File Size Access Actions
readme.txt 2021-07-10 2021-07-21 1.06 KB Open Access
decomp.py 2021-07-10 2021-07-10 9.32 KB Open Access
SCARDEC_decomp.npz 2021-07-10 2021-07-10 5.61 MB Open Access
SCARDEC.list 2021-07-10 2021-07-10 142 KB Open Access
sourcefunction_SCARDEC.zip 2021-07-10 2021-07-10 21.3 MB Open Access
syn.py 2021-07-10 2021-07-10 2.92 KB Open Access

## ---- README
This is the description of how to use the provided codes and data to produce results in the paper "Characterizing Multi-Subevent Earthquakes Using the Brune Source Model" by Meichen Liu, Yihe Huange, and Jeroen Ritsema.

## ---- SCARDEC analysis
## Input
"SCARDEC.list" is a list of earthquakes that are analyzed in the paper.
"sourcefunction_SCARDEC.zip" contains source-time information of all earthquakes in the list. It is also available through SCARDEC website: http://scardec.projects.sismo.ipgp.fr/ (all earthquakes Mw5.5-8.0 in 1992-2017).

## Running codes
"decomp.py" decomposes SCARDEC source time functions into Brune sources, plot reconstructed source time functions against the SCARDEC source time functions, and save the info of subevents for each earthquakes.

## Output
"SCARDEC_decomp.npz" is the output of "decomp.py" that contains info of subevents for each earthquakes.

## ---- Synthetic analysis
"syn.py" generates theoretical two-Brune-source source time functions with adjustable moment ratio, onset time difference, and corner frequencies.

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