Results 181 to 190 of about 1,774 (199)

Source of high tsunamis along the southernmost Ryukyu trench inferred from tsunami stratigraphy

Tectonophysics, 2018
Abstract Four paleotsunamis deposits are exposed in a trench on the coastal lowland north of the southern Ryukyu subduction zone trench. Radiocarbon ages on coral and bivalve shells show that the four deposits record tsunamis date from the last 2000 yrs., including a historical tsunami with a maximum run-up of 30 m in 1771, for an average recurrence ...
Masataka Ando, Akihisa Kitamura, Imai Takafumi   +2 more
exaly   +2 more sources

The Ryukyu Trench may function as a “depocenter” for anthropogenic marine litter

Journal of Oceanography, 2016
While concern over anthropogenic marine litter around coastlines is increasing worldwide, information on this litter in trenches on the seafloor is very sparse. We investigated the amount of marine litter on the deep-sea bottom around the Ryukyu Islands in the Northwest Pacific, based on trawl samples.
Motohiro Shimanaga, Kensuke Yanagi
exaly   +2 more sources

Interplate Coupling State at the Nansei‐Shoto (Ryukyu) Trench, Japan, Deduced From Seafloor Crustal Deformation Measurements [PDF]

Geophysical Research Letters, 2018
AbstractWe performed observations of seafloor crustal deformation employing the Global Navigation Satellite System/Acoustic technique at two stations installed at about 45 and 70 km from the axis of the Nansei‐Shoto (Ryukyu) Trench, to the southeast off the Okinawa Main Island.
Keiichi Tadokoro, Mamoru Nakamura, Masataka Ando   +2 more
exaly   +2 more sources

Late Quarternary paleoceanographic record from the middle Ryukyu Trench slope, northwest Pacific

Marine Micropaleontology, 1991
Abstract A piston core, KT84-14·P1, from the middle Ryukyu Trench slope, contains many paleoceanographic indicators of the past ca. 150,000 years. The age-assignment is based on such criteria as the abundance change between Gephyrocapsa ericsoni and Emiliania huxleyi , the datum of which is here substantiated by tephrochronology of an ash bed and ...
Hiroshi Ujiie´, Yuichiro Tanaka, Tomonori Ono   +2 more
openaire   +1 more source

Crustal structure across the middle Ryukyu trench obtained from ocean bottom seismographic data

Tectonophysics, 1996
Abstract In 1988 an extensive geophysical investigation was performed at the middle Ryukyu island arc, S. Japan. An aim of the investigation is to obtain a detailed crustal structure at the trench-arc-back-arc system by various geophysical surveys. In this paper we present fine crustal models obtained from ocean bottom seismographic (OBS) data along ...
S. Kodaira, T. Iwasaki, T. Urabe, T. Kanazawa, F. Egloff, J. Makris, H. Shimamura   +6 more
openaire   +1 more source

Deep crustal structure in the Taiwan–Ryukyu arc–trench system junction area: New constraints from gravity modelling

Terra Nova, 2021
AbstractThe Taiwan–Ryukyu arc–trench junction area is a seismic active region and has high potential to generate large earthquakes. However, the detailed deep structures are not fully revealed because of data resolution problems. The Taiwan Integrated Geodynamic Research (TAIGER) project collected two wide‐angle and multichannel seismic profiles across
Wen‐Bin Doo, Wen‐Nan Wu, Yin‐Sheng Huang, Chung‐Liang Lo, Hsueh‐Fen Wang, Shiou‐Ya Wang, Hao Kuo‐Chen   +6 more
openaire   +1 more source

Assemblages of Harpacticoida (Crustacea: Copepoda) from the Ryukyu and Kuril Trenches, north-west Pacific Ocean

Journal of the Marine Biological Association of the United Kingdom, 2011
To examine the specific features of trench communities, spatial changes in the assemblages of harpacticoids were investigated at the family level around the Ryukyu Trench (the Ryukyu region) and Kuril Trench (the Kuril region). In the Ryukyu region, there were high average dissimilarities in the harpacticoid assemblages among the trench, trench slope ...
Tomo Kitahashi, Kiichiro Kawamura, Gritta Veit-Köhler, Roberto Danovaro, John Tietjen, Shigeaki Kojima, Motohiro Shimanaga   +6 more
openaire   +1 more source

Bathymetric patterns of α and β diversity of harpacticoid copepods at the genus level around the Ryukyu Trench, and turnover diversity between trenches around Japan

Progress in Oceanography, 2014
Abstract The diversity of harpacticoid copepods was investigated around the Ryukyu Trench (430–7150 m), which lies below an oligotrophic subtropical ocean. The α diversity, which is based on the number of genera and Shannon diversity decreased with increasing water depth.
Tomo Kitahashi, Kiichiro Kawamura, Motohiro Shimanaga   +2 more
exaly   +2 more sources

Trench‐parallel flow in the southern Ryukyu subduction system: Effects of progressive rifting of the overriding plate

Journal of Geophysical Research: Solid Earth, 2013
AbstractThe Okinawa trough in the Ryukyu subduction system is one of a few actively extending back arc basins within the continental lithosphere. Recent shear‐wave splitting measurements show variable fast directions along the trough suggesting a complex three‐dimensional mantle flow field.
Shu-Chuan Lin, Ban-Yuan Kuo
exaly   +2 more sources

Very Low-Frequency Earthquakes and Earthquake Swarms in the Northern Ryukyu Trench

Slow earthquakes, distinct from regular earthquakes in their gradual release of seismic energy, play a key role in stress accumulation and release at subduction plate interfaces and have been proposed as potential precursors to large earthquakes. In the northern Ryukyu Trench, the Philippine Sea Plate subducts beneath the Eurasian Plate, and the region
Mamoru Nakamura, Ban-Yuan Kuo, Pei-Ying Patty Lin, Shuichi Kodaira, Yasushi Ishihara   +4 more
openaire   +1 more source