Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan
Broadband records from ocean-bottom seismometers deployed in the Okinawa trough and the Huatung basin were analyzed to provide seafloor noise characteristics and the detection thresholds for teleseismic body and surface waves. Ambient noise levels on the horizontal components are 10 - 40 dB higher t...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2010-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
| Subjects: | |
| Online Access: |
http://tao.cgu.org.tw/images/attachments/v0dsap000.pdf
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| _version_ | 1811292350862852096 |
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| author | Ching-Ren Lin Ban-Yuan Kuo Wen-Tzong Liang Wu-Cheng Chi Yu-Chih Huang John Collins Chien-Ying Wang |
| author_facet | Ching-Ren Lin Ban-Yuan Kuo Wen-Tzong Liang Wu-Cheng Chi Yu-Chih Huang John Collins Chien-Ying Wang |
| author_sort | Ching-Ren Lin |
| collection | DOAJ |
| description | Broadband records from ocean-bottom seismometers deployed in the Okinawa trough and the Huatung basin were analyzed to provide seafloor noise characteristics and the detection thresholds for teleseismic body and surface waves. Ambient noise levels on the horizontal components are 10 - 40 dB higher than on the vertical component, with the sensor seated on the surface of the sediment. On the vertical components, infragravity waves are 10 - 30 dB more energetic at the shallower Okinawa trough sites (≤ 2000 m depth) than at the deeper Huatung basin site (~4700 m). From 0.03 to 0.2 Hz, the Huatung basin noise levels are comparable to that of the broadband stations in Taiwan on a quiet day. The microseism peaks (~0.2 - 0.5 Hz) of OBSs reach or exceed the high noise model of continental stations. At regional distances Mw 6.5 is required for recording prominent Rayleigh waves if the source radiation is unfavorable, but 6.2 is sufficient for a favorable focal mecha¬nism. Several tens to over one hundred high-fidelity P, Pdiff and PKP waveforms have been recorded per year by OBSs at high corner frequency of 0.1 Hz with a minimum Mw 5.3 - 6.0. The number of recording drops to less than 5 per year at 1 Hz with Mw ≥ 6.4 and distances less than 90¢X. |
| first_indexed | 2024-04-13T04:44:08Z |
| format | Article |
| id | doaj.art-3e89e665bdb54278890ccb6ff0ba6a9f |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-04-13T04:44:08Z |
| publishDate | 2010-01-01 |
| publisher | Springer |
| record_format | Article |
| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-3e89e665bdb54278890ccb6ff0ba6a9f2022-12-22T03:01:54ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802010-01-0121500010.3319/TAO.2009.09.14.01(T)954Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern TaiwanChing-Ren LinBan-Yuan KuoWen-Tzong LiangWu-Cheng ChiYu-Chih HuangJohn CollinsChien-Ying WangBroadband records from ocean-bottom seismometers deployed in the Okinawa trough and the Huatung basin were analyzed to provide seafloor noise characteristics and the detection thresholds for teleseismic body and surface waves. Ambient noise levels on the horizontal components are 10 - 40 dB higher than on the vertical component, with the sensor seated on the surface of the sediment. On the vertical components, infragravity waves are 10 - 30 dB more energetic at the shallower Okinawa trough sites (≤ 2000 m depth) than at the deeper Huatung basin site (~4700 m). From 0.03 to 0.2 Hz, the Huatung basin noise levels are comparable to that of the broadband stations in Taiwan on a quiet day. The microseism peaks (~0.2 - 0.5 Hz) of OBSs reach or exceed the high noise model of continental stations. At regional distances Mw 6.5 is required for recording prominent Rayleigh waves if the source radiation is unfavorable, but 6.2 is sufficient for a favorable focal mecha¬nism. Several tens to over one hundred high-fidelity P, Pdiff and PKP waveforms have been recorded per year by OBSs at high corner frequency of 0.1 Hz with a minimum Mw 5.3 - 6.0. The number of recording drops to less than 5 per year at 1 Hz with Mw ≥ 6.4 and distances less than 90¢X. http://tao.cgu.org.tw/images/attachments/v0dsap000.pdf OBSNoise levelDetection threshold |
| spellingShingle | Ching-Ren Lin Ban-Yuan Kuo Wen-Tzong Liang Wu-Cheng Chi Yu-Chih Huang John Collins Chien-Ying Wang Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan Terrestrial, Atmospheric and Oceanic Sciences OBS Noise level Detection threshold |
| title | Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan |
| title_full | Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan |
| title_fullStr | Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan |
| title_full_unstemmed | Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan |
| title_short | Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan |
| title_sort | ambient noise and teleseismic signals recorded by ocean bottom seismometers offshore eastern taiwan |
| topic | OBS Noise level Detection threshold |
| url |
http://tao.cgu.org.tw/images/attachments/v0dsap000.pdf
|
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