ID | 61959 |
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Sort Key | 6
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Title Alternative | Estimation of displacement waveforms by baseline correction of near-fault acceleration records of the 2016 Kumamoto earthquake with median filter
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Author |
Watanabe, Tomotsugu
Graduate School of Natural Science and Technology, Okayama University
Komatsu, Masanao
Graduate School of Natural Science and Technology, Okayama University
Takenaka, Hiroshi
Graduate School of Natural Science and Technology, Okayama University
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Abstract | The 2016 Kumamoto earthquake sequence occurred on April 14 (MJMA 6.5) and April 16 (MJMA 7.3). Seismic intensity of 7 on the Japan Meteorological Agency (JMA) scale was observed in Mashiki Town, Kumamoto Prefecture for the both events and in Nishihara Village, Kumamoto Prefecture for the April-16 event. We estimate the displacement waveforms from these acceleration records. Since the acceleration seismograms include the long-period noise due to tilting of the ground and instrumental effects, the baseline corrections are required to derive the accurate velocity and displacement waveforms. We apply a median filter to the velocity waveforms to identify the linear trends on them due to the steplike noise on the acceleration records, and determine the time at which baseline shifts take place and the step value of each shift for the baseline correction through trial and error. Our baseline correction can successfully reconstruct the velocity and displacement waveforms from the acceleration records. The displacement waveforms show the static components consistent with the geodetic data.
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Keywords | 2016 Kumamoto earthquake
baseline correction
median filter
displacement
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Publication Title |
Okayama University Earth Science Report
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Published Date | 2021-03-31
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Volume | volume27
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Issue | issue1
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Publisher | 岡山大学理学部地球科学教室
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Publisher Alternative | Department of Earth Sciences, Faculty of Science, Okayama University
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Start Page | 39
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End Page | 50
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ISSN | 1340-7414
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NCID | AN10506284
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Content Type |
Departmental Bulletin Paper
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OAI-PMH Set |
岡山大学
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language |
Japanese
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Copyright Holders | © 2021 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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File Version | publisher
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Eprints Journal Name | esr
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