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Long-Period Long-Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals?

Li, Chenyu and Li, Zefeng and Peng, Zhigang and Zhang, Chengyuan and Nakata, Nori and Sickbert, Tim (2018) Long-Period Long-Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals? Seismological Research Letters, 89 (5). pp. 1652-1659. ISSN 0895-0695. https://resolver.caltech.edu/CaltechAUTHORS:20180802-083040921

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Abstract

In this study, we apply a recently developed local similarity method to detect long‐period long‐duration (LPLD) seismic events using 1‐month continuous waveforms recorded by a nodal array from the Incorporated Research Institutions for Seismology (IRIS) community wavefield experiment in Oklahoma. The local similarity method detects seismic events by correlating waveforms at each station with its neighboring stations. Using this method, we visually identify 21 potential tremor‐like LPLD events lasting more than 300 s during the 1‐month period. However, with beamforming analysis, we find that the source locations and waveform characteristics of these events are consistent with train‐generated seismic signals from the nearby Union Pacific railway. Additional evidence includes amplitude decay away from the railway track, and similarities in frequency–time contents with other confirmed train‐generated seismic signals. This case study highlights the need of dense‐array observations to distinguish between natural and anthropogenic LPLD seismic signals.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1785/02201080081DOIArticle
ORCID:
AuthorORCID
Li, Chenyu0000-0002-0442-6928
Li, Zefeng0000-0003-4405-8872
Peng, Zhigang0000-0002-0019-9860
Additional Information:© 2018 Seismological Society of America. Published Online 1 August 2018. Data and Resources: Seismic data used in this study are collected by the Incorporated Research Institutions for Seismology (IRIS) community wavefield experiment in Oklahoma and are open to public in the IRIS Data Management Center (DMC; http://ds.iris.edu/mda/YW?timewindow=2016-2016, last accessed June 2018). The authors appreciate Incorporated Research Institutions for Seismology (IRIS) for deployment of the IRIS community wavefield experiment in Oklahoma and making the data available to public. The authors thank Heather Deshon and Mike Brudzinski for pointing out potential train‐generated tremor‐like signals at the 2017 Eastern Section of Seismological Society of America Annual Meeting in Norman, Oklahoma. The authors appreciate Editor Brandon Schmandt, Abhijit Ghosh, and two anonymous reviewers for their constructive suggestions to improve this article. This article has benefitted from the valuable advice and help from Kevin Chao in Northwestern University, U.S.A., and Wei‐fang Sun in National Dong Hwa University, Taiwan. C. Li and Z. Peng are supported by National Science Foundation (NSF) Grants EAR‐1551022 and EAR‐1818611.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR‐1551022
NSFEAR‐1818611
Issue or Number:5
Record Number:CaltechAUTHORS:20180802-083040921
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180802-083040921
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88491
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Aug 2018 16:28
Last Modified:09 Mar 2020 13:19

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