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Rupture Directivity of the 18 April 2008 Mt. Carmel, Illinois, Earthquake from Modeling of Local Seismic Waveforms

He, Xiaohui and Zhan, Zhongwen and Zhang, Peizhen and Zhang, Dongli (2018) Rupture Directivity of the 18 April 2008 Mt. Carmel, Illinois, Earthquake from Modeling of Local Seismic Waveforms. Bulletin of the Seismological Society of America, 108 (6). pp. 3278-3288. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20181009-122428173

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Abstract

The 2008 M_w 5.2 Mt. Carmel earthquake is the largest earthquake in the last 50 yrs in southeastern Illinois, near the north termination of the north‐northeast‐trending Wabash Valley fault system (WVFS). The earthquake shows almost pure strike‐slip focal mechanism, but it is still uncertain which nodal plane (NP) is the ruptured fault plane. To resolve the fault plane, we determine rupture directivity of the earthquake via the relative centroid method. We begin with inverting the point‐source solution (strike 297°/dip 84°/rake 1° for NP1, strike 206°/dip 89°/rake 173° for NP2, and centroid depth 16 km) and then determine the relative location between the centroid and hypocenter via regional waveform fitting. Two M 4+ aftershocks are used as reference events, and the waveform time shifts of reference events with respect to the 1D velocity model are used to calibrate the path effects. The results show that the Illinois mainshock ruptured to east‐southeast along the 297° NP for about 2–3 km, consistent with relocated aftershock distribution, and we infer that the sinistral causative fault connects the north‐northwest‐trending La Salle anticlinal belt and the north‐northeast‐trending WVFS.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1785/0120180156DOIArticle
ORCID:
AuthorORCID
Zhan, Zhongwen0000-0002-5586-2607
Additional Information:© 2018 Seismological Society of America. Manuscript received 29 May 2018; Published Online 9 October 2018. Data and Resources: Earthquake seismograms used in this study were obtained from the Incorporated Research Institutions for Seismology (IRIS) Data Management Center. The Global Centroid Moment Tensor (CMT) moment tensor solution was obtained from http://www.globalcmt.org (last accessed April 2018). The Saint Louis University (SLU) moment solution was obtained from http://www.eas.slu.edu/eqc/eqc_mt/MECH.NA/20080418093700/index.html (last accessed April 2018), and the website is maintained by Robert Herrmann. The U.S. Geological Solution (USGS) body‐wave solution was obtained from and https://earthquake.usgs.gov/earthquakes/eventpage/nm606657#moment-tensor?source=us&code=pde20080418093659110_14_M_US (last accessed April 2018). This work made use of the Generic Mapping Tools (GMT) and Seismic Analysis Code (SAC). This study is supported by the National Natural Science Foundation of China (Grant Number 41590854, 41774049, and 41661134011) and the Guangdong Province Introduced Innovative R&D Team of Geological Processes and Natural Disasters around the South China Sea (2016ZT06N331). The authors thank Editor‐in‐Chief Thomas Pratt and three anonymous reviewers for constructive comments that helped improve the article.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41590854
National Natural Science Foundation of China41774049
National Natural Science Foundation of China41661134011
Guangdong Province2016ZT06N331
Issue or Number:6
Record Number:CaltechAUTHORS:20181009-122428173
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181009-122428173
Official Citation:Xiaohui He, Zhongwen Zhan, Peizhen Zhang, Dongli Zhang; Rupture Directivity of the 18 April 2008 Mt. Carmel, Illinois, Earthquake from Modeling of Local Seismic Waveforms. Bulletin of the Seismological Society of America ; 108 (6): 3278–3288. doi: https://doi.org/10.1785/0120180156
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90192
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Oct 2018 18:03
Last Modified:03 Oct 2019 20:22

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