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

被引：15

作者：

Lin, Ching-Ren ^{[1
,2
]}

Kuo, Ban-Yuan ^{[1
,2
]}

Liang, Wen-Tzong ^{[1
]}

Chi, Wu-Cheng ^{[1
]}

Huang, Yu-Chih ^{[2
]}

Collins, John ^{[3
]}

Wang, Chien-Ying ^{[2
]}

机构：

[1] Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan

[2] Natl Cent Univ, Dept Earth Sci, Jhongli, Taiwan

[3] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA

来源：

TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES | 2010年 / 21卷 / 05期

关键词：

OBS; Noise level; Detection threshold; NETWORK PILOT EXPERIMENT; BROAD-BAND SEISMOLOGY; STRUCTURE BENEATH; PACIFIC RISE; MANTLE FLOW; SEA-FLOOR; SEISMIC OBSERVATION; MELT REGION; EARTHQUAKES; WAVES;

D O I：

10.3319/TAO.2009.09.14.01(T)

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 (similar to 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 (similar to 0.2 - 0.5 Hz) of OBSs reach or exceed the high noise model of continental stations. At regional distances M-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-diff and PKP waveforms have been recorded per year by OBSs at high corner frequency of 0.1 Hz with a minimum M-w 5.3 - 6.0. The number of recording drops to less than 5 per year at 1 Hz with M-w >= 6.4 and distances less than 90 degrees.

引用

页码：743 / 755

页数：13

共 29 条

[1]

[Anonymous], 93322 USGS

[2] Improvement of seismic observation in the ocean by use of seafloor boreholes [J].

Araki, E ;

Shinohara, M ;

Sacks, S ;

Linde, A ;

Kanazawa, T ;

Shiobara, H ;

Mikada, H ;

Suyehiro, K .

BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2004, 94 (02) :678-690

[3]

Blackman DK, 1995, B SEISMOL SOC AM, V85, P1648

[4] Upper mantle structure beneath the Hawaiian swell: Constraints from the ocean seismic network pilot experiment [J].

Collins, JA ;

Vernon, FL ;

Orcutt, JA ;

Stephen, RA .

GEOPHYSICAL RESEARCH LETTERS, 2002, 29 (11) :17-1

[5] Broadband seismology in the oceans: Lessons from the Ocean Seismic Network Pilot Experiment [J].

Collins, JA ;

Vernon, FL ;

Orcutt, JA ;

Stephen, RA ;

Peal, KR ;

Wooding, FB ;

Spiess, FN ;

Hildebrand, JA .

GEOPHYSICAL RESEARCH LETTERS, 2001, 28 (01) :49-52

[6]

COLLINS JA, 2008, EOS T AGU S, V89

[7] Observations of infragravity waves at the Monterey ocean bottom broadband station (MOBB) [J].

Dolenc, D ;

Romanowicz, B ;

Stakes, D ;

McGill, P ;

Neuhauser, D .

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 2005, 6

[8] Observations of infragravity waves at the ocean-bottom broadband seismic stations Endeavour (KEBB) and Explorer (KXBB) [J].

Dolenc, David ;

Romanowicz, Barbara ;

McGill, Paul ;

Wilcock, William .

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 2008, 9

[9] Why bury ocean bottom seismometers? [J].

Duennebier, Fred K. ;

Sutton, George H. .

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 2007, 8

[10] TRAVELTIMES FOR GLOBAL EARTHQUAKE LOCATION AND PHASE IDENTIFICATION [J].

KENNETT, BLN ;

ENGDAHL, ER .

GEOPHYSICAL JOURNAL INTERNATIONAL, 1991, 105 (02) :429-465

← 1 2 3 →