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Shuhei TSUJI
Nagoya Daigaku Daigakuin Kankyogaku Kenkyuka
Corresponding Author
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We developed a method to detect attenuation changes during seismic wave propagation excited by precisely controlled artificial seismic sources, namely Accurately Controlled Routinely Operated Signal System (ACROSS), and applied it to monitor the temporal changes for in situ data collected by previous studies. Our method, together with the use of the ACROSS sources, is less susceptible to noise level changes, from which conventional methods such as envelope calculation suffer. The method utilizes the noise level that is independently estimated in the frequency domain and eliminates the influence of the noise from the observed signal. For performance testing, we applied this method to a dataset that was obtained in an experiment at Awaji Island, Japan, from 2000 to 2001. We detected a change in amplitude caused by rainfall, variation in atmospheric temperature, and coseismic ground motions. Among them, coseismic changes are of particular interest because there are limited studies on coseismic attenuation change, in contrast to many studies on coseismic velocity decrease. At the 2000 Western Tottori earthquake (MW = 6.6, epicenter distance of 165 km), a sudden decrease in amplitude of up to 5% was observed. The coseismic amplitude reduction and its anisotropic characteristics, which showed a larger reduction in the direction of the major axis of velocity decrease, were consistent with the opening of fluid-filled cracks, as proposed by previous studies. The W corresponding to the amplitude change gives similar values to those reported in previous studies using natural earthquakes.
Keywords
attenuation, amplitude, coseismic change, anisotropy, artificial seismic source, ACROSS
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CURRENT STATUS: Under Review
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Posted 10 Mar, 2021
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Editorial decision: Major Revision
On 21 Jun, 2021
Review #2 received
Received 18 Apr, 2021
Review #1 received
Received 18 Apr, 2021
Reviewer #2 agreed
On 11 Mar, 2021
Reviews received
Received 10 Mar, 2021
Reviewer #1 agreed
On 10 Mar, 2021
Reviewers invited
Invitations sent on 08 Mar, 2021
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This preprint is under consideration at Earth, Planets and Space. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Full paper
Shuhei TSUJI
Nagoya Daigaku Daigakuin Kankyogaku Kenkyuka
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 10 Mar, 2021
No community comments so far
Editorial decision: Major Revision
On 21 Jun, 2021
Review #2 received
Received 18 Apr, 2021
Review #1 received
Received 18 Apr, 2021
Reviewer #2 agreed
On 11 Mar, 2021
Reviews received
Received 10 Mar, 2021
Reviewer #1 agreed
On 10 Mar, 2021
Reviewers invited
Invitations sent on 08 Mar, 2021
Submission checks complete
On 03 Mar, 2021
Editor invited
On 03 Mar, 2021
Editor assigned
On 02 Mar, 2021
First submitted
On 12 Feb, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
We developed a method to detect attenuation changes during seismic wave propagation excited by precisely controlled artificial seismic sources, namely Accurately Controlled Routinely Operated Signal System (ACROSS), and applied it to monitor the temporal changes for in situ data collected by previous studies. Our method, together with the use of the ACROSS sources, is less susceptible to noise level changes, from which conventional methods such as envelope calculation suffer. The method utilizes the noise level that is independently estimated in the frequency domain and eliminates the influence of the noise from the observed signal. For performance testing, we applied this method to a dataset that was obtained in an experiment at Awaji Island, Japan, from 2000 to 2001. We detected a change in amplitude caused by rainfall, variation in atmospheric temperature, and coseismic ground motions. Among them, coseismic changes are of particular interest because there are limited studies on coseismic attenuation change, in contrast to many studies on coseismic velocity decrease. At the 2000 Western Tottori earthquake (MW = 6.6, epicenter distance of 165 km), a sudden decrease in amplitude of up to 5% was observed. The coseismic amplitude reduction and its anisotropic characteristics, which showed a larger reduction in the direction of the major axis of velocity decrease, were consistent with the opening of fluid-filled cracks, as proposed by previous studies. The W corresponding to the amplitude change gives similar values to those reported in previous studies using natural earthquakes.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
The full text of this article is available to read as a PDF.
This is a list of supplementary files associated with this preprint. Click to download.
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