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

Research Article| August 01, 2018 Long‐Period Long‐Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals? Chenyu Li; Chenyu Li aSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332 U.S.A., lchenyu@gatech.edu Search for other works by this author on: GSW Google Scholar Zefeng Li; Zefeng Li bSeismological Laboratory, California Institute of Technology, Pasadena, California 91125 U.S.A. Search for other works by this author on: GSW Google Scholar Zhigang Peng; Zhigang Peng aSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332 U.S.A., lchenyu@gatech.edu Search for other works by this author on: GSW Google Scholar Chengyuan Zhang; Chengyuan Zhang cState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China Search for other works by this author on: GSW Google Scholar Nori Nakata; Nori Nakata dSchool of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019 U.S.A. Search for other works by this author on: GSW Google Scholar Tim Sickbert Tim Sickbert eBoone Pickens School of Geology, Oklahoma States University, Stillwater, Oklahoma 74078 U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Chenyu Li aSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332 U.S.A., lchenyu@gatech.edu Zefeng Li bSeismological Laboratory, California Institute of Technology, Pasadena, California 91125 U.S.A. Zhigang Peng aSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332 U.S.A., lchenyu@gatech.edu Chengyuan Zhang cState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China Nori Nakata dSchool of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019 U.S.A. Tim Sickbert eBoone Pickens School of Geology, Oklahoma States University, Stillwater, Oklahoma 74078 U.S.A. Publisher: Seismological Society of America First Online: 22 Aug 2018 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2018) 89 (5): 1652–1659. https://doi.org/10.1785/0220180081 Article history First Online: 22 Aug 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chenyu Li, Zefeng Li, Zhigang Peng, Chengyuan Zhang, Nori Nakata, Tim Sickbert; Long‐Period Long‐Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals?. Seismological Research Letters 2018;; 89 (5): 1652–1659. doi: https://doi.org/10.1785/0220180081 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.