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Title: Characteristics of Airplanes and Helicopters Recorded by a Dense Seismic Array Near Anza California

Abstract

We observe frequent air traffic events in continuous seismic waveforms recorded for about 30 days by 1,108 vertical geophones in a tight array on the San Jacinto fault zone. The waveforms of the air traffic events resemble tremor or collections of small earthquakes. However, time-frequency analysis reveals clear Doppler effects that can be modeled with basic equations and fitted well with parameters corresponding to airplanes and helicopters. The flying traces can be inverted by fitting the parameters at each station across the entire array. About 31 air traffic events are detected per day in the relatively remote study area, with peak activity from about 8:00 to 18:00 and significantly fewer events between 23:00 and 4:00 local time. The average event duration is about 200 s, so they cover together>7% of the day. To estimate the total time covered by earthquakes, we derive a scaling relation logτ(M) = 0.41M + 0.89 between earthquake duration and magnitudes using data of 266 earthquakes in the magnitude range 0 ≤ M ≤ 3. The results indicate that in most places, the duration of air traffic events is likely to exceed considerably the total time covered by earthquakes.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Southern California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1539723
Alternate Identifier(s):
OSTI ID: 1440259
Grant/Contract Number:  
SC0016520
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geochemistry & Geophysics

Citation Formats

Meng, Haoran, and Ben-Zion, Yehuda. Characteristics of Airplanes and Helicopters Recorded by a Dense Seismic Array Near Anza California. United States: N. p., 2018. Web. doi:10.1029/2017jb015240.
Meng, Haoran, & Ben-Zion, Yehuda. Characteristics of Airplanes and Helicopters Recorded by a Dense Seismic Array Near Anza California. United States. doi:10.1029/2017jb015240.
Meng, Haoran, and Ben-Zion, Yehuda. Fri . "Characteristics of Airplanes and Helicopters Recorded by a Dense Seismic Array Near Anza California". United States. doi:10.1029/2017jb015240. https://www.osti.gov/servlets/purl/1539723.
@article{osti_1539723,
title = {Characteristics of Airplanes and Helicopters Recorded by a Dense Seismic Array Near Anza California},
author = {Meng, Haoran and Ben-Zion, Yehuda},
abstractNote = {We observe frequent air traffic events in continuous seismic waveforms recorded for about 30 days by 1,108 vertical geophones in a tight array on the San Jacinto fault zone. The waveforms of the air traffic events resemble tremor or collections of small earthquakes. However, time-frequency analysis reveals clear Doppler effects that can be modeled with basic equations and fitted well with parameters corresponding to airplanes and helicopters. The flying traces can be inverted by fitting the parameters at each station across the entire array. About 31 air traffic events are detected per day in the relatively remote study area, with peak activity from about 8:00 to 18:00 and significantly fewer events between 23:00 and 4:00 local time. The average event duration is about 200 s, so they cover together>7% of the day. To estimate the total time covered by earthquakes, we derive a scaling relation logτ(M) = 0.41M + 0.89 between earthquake duration and magnitudes using data of 266 earthquakes in the magnitude range 0 ≤ M ≤ 3. The results indicate that in most places, the duration of air traffic events is likely to exceed considerably the total time covered by earthquakes.},
doi = {10.1029/2017jb015240},
journal = {Journal of Geophysical Research. Solid Earth},
number = 6,
volume = 123,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 8 works
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    Works referencing / citing this record:

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    Detection of random noise and anatomy of continuous seismic waveforms in dense array data near Anza California
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