Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh
This study analyses the ambient noise field recorded by the seismic network, TREMBLE, in Bangladesh, operational since late 2016. Horizontal-vertical spectral ratios confirm the placement of stations on sediment, many situated on thick sedimentary columns, consistent with local geology. Noise across...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2024
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| Online Access: | https://hdl.handle.net/10356/178623 |
| _version_ | 1826115985216634880 |
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| author | Syed Idros Bin Abdul Rahman Lythgoe, Karen Muktadir, Md. Golam Akhter, Syed Humayun Hubbard, Judith |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Syed Idros Bin Abdul Rahman Lythgoe, Karen Muktadir, Md. Golam Akhter, Syed Humayun Hubbard, Judith |
| author_sort | Syed Idros Bin Abdul Rahman |
| collection | NTU |
| description | This study analyses the ambient noise field recorded by the seismic network, TREMBLE, in Bangladesh, operational since late 2016. Horizontal-vertical spectral ratios confirm the placement of stations on sediment, many situated on thick sedimentary columns, consistent with local geology. Noise across the broadband spectrum is systematically examined. A high amplitude local microseism (0.4–0.8 Hz) is recorded, originating near the coast and modulated by local tides. The secondary microseism (0.15–0.35 Hz) correlates strongly with wave height in the Bay of Bengal and varies with seasons, with greater power and higher horizontal amplitude in the monsoon season when the wave height is highest. The microseism increases in amplitude and decreases in frequency as a tropical depression moves inland. The primary microseism (∼0.07–0.08 Hz) exhibits no seasonal changes in power but display strong horizontal energy which changes with seasons. Low frequency (0.02–0.04 Hz) noise on the horizontal components has a 24-h periodicity, due to instrument tilt caused by atmospheric pressure changes. A station located next to the major Karnaphuli River shows elevated energy at ∼5 Hz correlated to periods of high rainfall. Anthropogenic noise (∼4–14 Hz) is station-dependent, demonstrating changing patterns in human activity, such as during Ramadan, national holidays and the COVID pandemic. Our work holds implications for seismic deployments, earthquake, and imaging studies, while providing insights into the interaction between the atmosphere, ocean, and solid Earth. |
| first_indexed | 2024-10-01T04:04:01Z |
| format | Journal Article |
| id | ntu-10356/178623 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:04:01Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1786232024-07-01T15:30:43Z Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh Syed Idros Bin Abdul Rahman Lythgoe, Karen Muktadir, Md. Golam Akhter, Syed Humayun Hubbard, Judith Asian School of the Environment Earth Observatory of Singapore Earth and Environmental Sciences Site characterisation Microseism This study analyses the ambient noise field recorded by the seismic network, TREMBLE, in Bangladesh, operational since late 2016. Horizontal-vertical spectral ratios confirm the placement of stations on sediment, many situated on thick sedimentary columns, consistent with local geology. Noise across the broadband spectrum is systematically examined. A high amplitude local microseism (0.4–0.8 Hz) is recorded, originating near the coast and modulated by local tides. The secondary microseism (0.15–0.35 Hz) correlates strongly with wave height in the Bay of Bengal and varies with seasons, with greater power and higher horizontal amplitude in the monsoon season when the wave height is highest. The microseism increases in amplitude and decreases in frequency as a tropical depression moves inland. The primary microseism (∼0.07–0.08 Hz) exhibits no seasonal changes in power but display strong horizontal energy which changes with seasons. Low frequency (0.02–0.04 Hz) noise on the horizontal components has a 24-h periodicity, due to instrument tilt caused by atmospheric pressure changes. A station located next to the major Karnaphuli River shows elevated energy at ∼5 Hz correlated to periods of high rainfall. Anthropogenic noise (∼4–14 Hz) is station-dependent, demonstrating changing patterns in human activity, such as during Ramadan, national holidays and the COVID pandemic. Our work holds implications for seismic deployments, earthquake, and imaging studies, while providing insights into the interaction between the atmosphere, ocean, and solid Earth. Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) Published version The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This research was supported by the Earth Observatory of Singapore, the National Research Foundation of Singapore, and the Singapore Ministry of Education under the Research Centres of Excellence initiative. This research was funded in part by NERC award NE/W008289/1. 2024-07-01T06:40:54Z 2024-07-01T06:40:54Z 2024 Journal Article Syed Idros Bin Abdul Rahman, Lythgoe, K., Muktadir, M. G., Akhter, S. H. & Hubbard, J. (2024). Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh. Frontiers in Earth Science, 12, 1334248-. https://dx.doi.org/10.3389/feart.2024.1334248 2296-6463 https://hdl.handle.net/10356/178623 10.3389/feart.2024.1334248 2-s2.0-85185119195 12 1334248 en Frontiers in Earth Science © 2024 Bin Abdul Rahman, Lythgoe, Muktadir, Akhter and Hubbard. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. application/pdf |
| spellingShingle | Earth and Environmental Sciences Site characterisation Microseism Syed Idros Bin Abdul Rahman Lythgoe, Karen Muktadir, Md. Golam Akhter, Syed Humayun Hubbard, Judith Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh |
| title | Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh |
| title_full | Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh |
| title_fullStr | Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh |
| title_full_unstemmed | Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh |
| title_short | Characterization and spatiotemporal variations of ambient seismic noise in eastern Bangladesh |
| title_sort | characterization and spatiotemporal variations of ambient seismic noise in eastern bangladesh |
| topic | Earth and Environmental Sciences Site characterisation Microseism |
| url | https://hdl.handle.net/10356/178623 |
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