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Large air pressure changes triggered by P-SV ground motion in a cave in northern Taiwan
Chieh-Hung Chen
China University of Geosciences
Corresponding Author
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A barometer in the cave of the SBCB station records an unusual phenomenon of larger amplitudes in air pressure changes inside than those at the Xinwu station (outside). Accordingly, the comparison between the recorded data at the SBCB and Xinwu station can drive investigations of potential sources of the unusual phenomenon. Analytical results of phase angle differences reveal that the air pressure outside the cave at the Xinwu station often leads air pressure changes inside at the SBCB station at relatively low frequency bands. In contrast, the larger pressure changes at frequencies > 2×10-4 Hz inside the cave at the SBCB station lead smaller changes outside at the Xinwu station. To expose causal mechanisms of the unusual phenomenon, continuous seismic waveforms recorded inside the cave at the SBCB station are further conducted for examination. When the horizontal and vertical ground velocities of ground motion yield a difference in the phase angle close to 90°, amplitudes of the air pressure changes at the SBCB station are amplified accordingly. This suggests that the pressure-shear vertical ground motion can drive air pressure changes. Meanwhile, the results shed light on investigating the existence of acoustic waves near the Earth’s surface using a partially confined space underground due to that the assumptions of the waves can propagate upward in the atmosphere driving changes in the ionosphere.
Keywords
Air pressure, Pressure-Shear vertical waves, Acoustic waves
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CURRENT STATUS: Under Review
Version 2
Posted 05 Jan, 2021
No community comments so far
Review #1 received
Received 23 Dec, 2020
Reviewer #2 agreed
On 21 Dec, 2020
Editor assigned
On 20 Dec, 2020
Reviewers invited
Invitations sent on 20 Dec, 2020
Reviewer #1 agreed
On 20 Dec, 2020
Submission checks complete
On 20 Dec, 2020
Editor invited
On 20 Dec, 2020
No comments provided
Reviewer #2 agreed
On 26 Oct, 2020
Reviewer #1 agreed
On 25 Oct, 2020
Review #1 received
Received 25 Oct, 2020
Reviewers invited
Invitations sent on 11 Aug, 2020
First submitted
On 10 Aug, 2020
Editor invited
On 10 Aug, 2020
Editor assigned
On 10 Aug, 2020
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On 09 Aug, 2020
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Geophysics
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This preprint is under consideration at Geoscience Letters. 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
Research Letter
Large air pressure changes triggered by P-SV ground motion in a cave in northern Taiwan
Chieh-Hung Chen
China University of Geosciences
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 2
Posted 05 Jan, 2021
No community comments so far
Review #1 received
Received 23 Dec, 2020
Reviewer #2 agreed
On 21 Dec, 2020
Editor assigned
On 20 Dec, 2020
Reviewers invited
Invitations sent on 20 Dec, 2020
Reviewer #1 agreed
On 20 Dec, 2020
Submission checks complete
On 20 Dec, 2020
Editor invited
On 20 Dec, 2020
No comments provided
Reviewer #2 agreed
On 26 Oct, 2020
Reviewer #1 agreed
On 25 Oct, 2020
Review #1 received
Received 25 Oct, 2020
Reviewers invited
Invitations sent on 11 Aug, 2020
First submitted
On 10 Aug, 2020
Editor invited
On 10 Aug, 2020
Editor assigned
On 10 Aug, 2020
Submission checks complete
On 09 Aug, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Geophysics
License:
This work is licensed under a CC BY 4.0 License. Read Full License
A barometer in the cave of the SBCB station records an unusual phenomenon of larger amplitudes in air pressure changes inside than those at the Xinwu station (outside). Accordingly, the comparison between the recorded data at the SBCB and Xinwu station can drive investigations of potential sources of the unusual phenomenon. Analytical results of phase angle differences reveal that the air pressure outside the cave at the Xinwu station often leads air pressure changes inside at the SBCB station at relatively low frequency bands. In contrast, the larger pressure changes at frequencies > 2×10-4 Hz inside the cave at the SBCB station lead smaller changes outside at the Xinwu station. To expose causal mechanisms of the unusual phenomenon, continuous seismic waveforms recorded inside the cave at the SBCB station are further conducted for examination. When the horizontal and vertical ground velocities of ground motion yield a difference in the phase angle close to 90°, amplitudes of the air pressure changes at the SBCB station are amplified accordingly. This suggests that the pressure-shear vertical ground motion can drive air pressure changes. Meanwhile, the results shed light on investigating the existence of acoustic waves near the Earth’s surface using a partially confined space underground due to that the assumptions of the waves can propagate upward in the atmosphere driving changes in the ionosphere.
Figure 1
Figure 2
Figure 3