NDLI: Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan

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Ambient Noise and Teleseismic Signals Recorded by Ocean-Bottom Seismometers Offshore Eastern Taiwan

Content Provider	Semantic Scholar
Author	Lin, Ching-Ren Kuo, Ban-Yuan Liang, Wen-Tzong Huang, Yu-Chih Collins, John A. Wang, C. Y.
Copyright Year	2010
Abstract	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 M(subscript w) 6.5 is required for recording prominent Rayleigh waves if the source radiation is unfavorable, but 6.2 is sufficient for a favorable focal mechanism. Several tens to over one hundred high-fidelity P, P(subscript diff) and PKP waveforms have been recorded per year by OBSs at high corner frequency of 0.1 Hz with a minimum M(subscript w) 5.3-6.0. The number of recording drops to less than 5 per year at 1 Hz with M(subscript w)≥6.4 and distances less than 90°.
Starting Page	743
Ending Page	755
Page Count	13
File Format	PDF HTM / HTML
DOI	10.3319/tao.2009.09.14.01(t)
Volume Number	21
Alternate Webpage(s)	http://tao.cgu.org.tw/index.php/articles/archive/geophysics/item/download/2647_45dc9405c39f16d6bab7b4788e04c58e
Alternate Webpage(s)	https://doi.org/10.3319/tao.2009.09.14.01%28t%29
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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