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

Li Chenyu; Li Zefeng; Peng Zhigang; Zhang Chengyuan; Nakata Nori; Sickbert Tim

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

机译：俄克拉荷马州虹膜社区波场演示实验检测的长期长期事件：震颤或火车信号？

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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.

机译：在这项研究中，我们应用最近开发的本地相似性方法来检测使用由Nodal阵列记录的1个月连续波形的长期长期（LPLD）地震事件从已加入的研究机构进行地震学（IRIS）社区波场实验俄克拉荷马州。局部相似性方法通过将每个站的波形与其相邻站相关联来检测地震事件。使用此方法，我们在1个月期间，我们通过视觉识别持续超过300秒的21个潜在震颤的LPLD事件。然而，通过波束成形分析，我们发现这些事件的源位置和波形特性与来自附近联合太平洋铁路的火车产生的地震信号一致。附加证据包括远离铁路轨道的幅度衰减，以及与其他确认的火车产生的地震信号的频率 - 时间内容的相似度。本案例研究突出了致密阵列观测的需要，以区分天然和人为的LPLD地震信号。

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来源
《Seismological research letters》 |2018年第5期|共8页
作者
Li Chenyu; Li Zefeng; Peng Zhigang; Zhang Chengyuan; Nakata Nori; Sickbert Tim;
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作者单位

Georgia Inst Technol Sch Earth &

Atmospher Sci Atlanta GA 30332 USA;

CALTECH Seismol Lab Pasadena CA 91125 USA;

Georgia Inst Technol Sch Earth &

Atmospher Sci Atlanta GA 30332 USA;

Chinese Acad Sci State Key Lab Geomech &

Geotech Engn Inst Rock &

Soil Mech Wuhan 430071 Hubei Peoples R China;

Univ Oklahoma Sch Geol &

Geophys Norman OK 73019 USA;

Oklahoma State Univ Boone Pickens Sch Geol Stillwater OK 74078 USA;

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原文格式 PDF
正文语种 eng
中图分类地震学;
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1. Long-Period Long-Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals? [J] . Li Chenyu, Li Zefeng, Peng Zhigang, Seismological research letters . 2018,第5期

机译：俄克拉荷马州虹膜社区波场演示实验检测的长期长期事件：震颤或火车信号？
2. On the nature of long-period long-duration seismic events detected during hydraulic fracturing [J] . Zecevic Megan, Daniel Guillaume, Jurick Dana Geophysics: Journal of the Society of Exploration Geophysicists . 2016,第3期

机译：关于水力压裂过程中发现的长时间长期地震事件的性质
3. A Community Experiment to Record the Full Seismic Wavefield in Oklahoma [J] . Sweet Justin R., Anderson Kent R., Bilek Susan, Seismological research letters . 2018,第5期

机译：俄克拉荷马州全面地震波峰的社区实验
4. Detecting long-period long-duration microseismic events during hydraulic fracturing in the Cline Shale Formation, West Texas: A Case Study [C] . Chven Mitchell, Julia Kurpan, Paige Snelling SEG Houston 2013 . 2013

机译：德克萨斯州克莱斯碎片形成过程中液压压裂期间的长期长期微震事件：案例研究
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Long-Period Long-Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals?

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