A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone
碩士 === 國立臺灣海洋大學 === 應用地球科學研究所 === 100 === During the Leg 4 of TAIGER experiment (June-July, 2009), a long MCS/OBS profile of 550 km was shot by R/V Langseth in the West Philippine Basin. We placed 28 short-period OBSs at a station-to-station distance of 15 km along this profile. This profile was des...
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ndltd-TW-100NTOU51350012015-10-13T22:01:07Z http://ndltd.ncl.edu.tw/handle/37211985348213489120 A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone 沿著呂宋-沖繩破碎帶的地殼構造初步研究 Wei-Yu Lai 賴威宇 碩士 國立臺灣海洋大學 應用地球科學研究所 100 During the Leg 4 of TAIGER experiment (June-July, 2009), a long MCS/OBS profile of 550 km was shot by R/V Langseth in the West Philippine Basin. We placed 28 short-period OBSs at a station-to-station distance of 15 km along this profile. This profile was designed to be 90 degree to the spreading fabric as previously mapped by the multi-beam echo-sounding data. Because of the Typhoon Molave, R/V Langseth shot 3 times to complete the whole track. The large air-gun sources and over-lapping shoots allow us to place the shoot geometry into a single-combined profile. An initial OBS model indicates that the Pn arrival can be traced up to 80 more km away from the OBS station center. In this study, P-wave velocity model show that the crust thickness in the study area is about 6-10 km, and belongs to the typical oceanic crust. The roughness in the 6.0-7.0 km/sec P-wave velocity may be associated with the dense volcanic bodies. The multi-beam echo-sounding data show a big amount of submarine volcanoes, and some over-lapping spreading ridges. This environment is similar to that of the present-day the Eastern Pacific Rise with high spreading rate of 9-10 cm/yr. Previous magnetic lineations indicate that the age of study area is about 40-50 MYBP and the spreading rate about 8.8 cm/yr. Numerous volcanoes and over-lapping spreading centers may be related to the motion change of Pacific Plate at about 45 MYBP. The direction change of the spreading centers between the West Philippine Basin (NE-SW) and Huatung Basin (N-S) suggest that the West Philippine Basin was in a counter-clockwise rotation through its tectonic evolution. Chao-Shing Lee 李昭興 2012 學位論文 ; thesis 77 zh-TW |
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碩士 === 國立臺灣海洋大學 === 應用地球科學研究所 === 100 === During the Leg 4 of TAIGER experiment (June-July, 2009), a long
MCS/OBS profile of 550 km was shot by R/V Langseth in the West
Philippine Basin. We placed 28 short-period OBSs at a station-to-station
distance of 15 km along this profile. This profile was designed to be 90
degree to the spreading fabric as previously mapped by the multi-beam
echo-sounding data. Because of the Typhoon Molave, R/V Langseth shot
3 times to complete the whole track. The large air-gun sources and
over-lapping shoots allow us to place the shoot geometry into a
single-combined profile. An initial OBS model indicates that the Pn
arrival can be traced up to 80 more km away from the OBS station center.
In this study, P-wave velocity model show that the crust thickness in the
study area is about 6-10 km, and belongs to the typical oceanic crust. The
roughness in the 6.0-7.0 km/sec P-wave velocity may be associated with
the dense volcanic bodies. The multi-beam echo-sounding data show a
big amount of submarine volcanoes, and some over-lapping spreading
ridges. This environment is similar to that of the present-day the Eastern
Pacific Rise with high spreading rate of 9-10 cm/yr. Previous magnetic
lineations indicate that the age of study area is about 40-50 MYBP and
the spreading rate about 8.8 cm/yr. Numerous volcanoes and over-lapping
spreading centers may be related to the motion change of Pacific Plate at
about 45 MYBP. The direction change of the spreading centers between
the West Philippine Basin (NE-SW) and Huatung Basin (N-S) suggest
that the West Philippine Basin was in a counter-clockwise rotation
through its tectonic evolution.
|
author2 |
Chao-Shing Lee |
author_facet |
Chao-Shing Lee Wei-Yu Lai 賴威宇 |
author |
Wei-Yu Lai 賴威宇 |
spellingShingle |
Wei-Yu Lai 賴威宇 A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone |
author_sort |
Wei-Yu Lai |
title |
A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone |
title_short |
A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone |
title_full |
A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone |
title_fullStr |
A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone |
title_full_unstemmed |
A preliminary study of crustal structure along the Luzon-Okinawa Fracture Zone |
title_sort |
preliminary study of crustal structure along the luzon-okinawa fracture zone |
publishDate |
2012 |
url |
http://ndltd.ncl.edu.tw/handle/37211985348213489120 |
work_keys_str_mv |
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