A5009222286- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Geotechnical Engineering and Underground Structures
- Seismic Waves and Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Seismology and Earthquake Studies
- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Oceanographic and Atmospheric Processes
- Seismic Imaging and Inversion Techniques
- Underwater Vehicles and Communication Systems
- Earthquake Detection and Analysis
- Metal Forming Simulation Techniques
- Geotechnical and Geomechanical Engineering
- Landslides and related hazards
- Grouting, Rheology, and Soil Mechanics
- Cytokine Signaling Pathways and Interactions
- Geological and Geochemical Analysis
- Marine animal studies overview
- HER2/EGFR in Cancer Research
- Earthquake and Tsunami Effects
- Geological formations and processes
- Vibration and Dynamic Analysis
- Lung Cancer Treatments and Mutations
Bridgestone (Japan)
2024
Oregon State University
1997-2017
National Oceanic and Atmospheric Administration
2012
Ministry of Land, Infrastructure, Transport and Tourism
2005
NOAA Pacific Marine Environmental Laboratory
2005
University of Hawaii System
2005
Tokyo University of Marine Science and Technology
2003
Kyushu University
2002
National Cancer Center Hospital East
1998
Oregon Department of Fish and Wildlife
1997
Extraordinary video and hydrophone observations of a submarine explosive eruption were made with remotely operated vehicle in April 2006 at depth 550–560 m on NW Rota‐1 volcano the Mariana arc. The observed evolved from effusive to explosive, while rate increased near zero 10–100 3 /h. During peak activity, cyclic bursts 2–6 min long separated by shorter non‐eruptive pauses lasting s. size ejecta vigor explosions. A portable deployed vent recorded sounds correlated bursts; highest amplitudes...
The dispersion of SeaMARC II phase-difference samples is discussed. They appear to be a function signal direction, range, noise level, and backscatter strength the bottom. Field data from lava flow area sedimented areas at different depths are compared. temporal distribution was skewed asymmetrical about model. angular symmetrical mode, with some phase wrap-around. field show presence complicated interference field. amount larger than that calculated by using simple Gaussian isotropic model,...
Blue whale sound production has been thought to occur by Helmholtz resonance via air flowing from the lungs into upper respiratory spaces. This implies that frequency of blue vocalizations might be directly proportional size their sound-producing organs. Here we present a mechanism where fundamental and overtone frequencies B calls can well modeled using series short-duration (<1 s) wavelets. We propose likely source these wavelets are pneumatic pulses caused opening closing valves during...
A non-linear seismic response analysis method for 2-D saturated soil–structure system with an absorbing boundary is presented. According to the 3-D strain space multimechanism model cyclic mobility of sandy soil, a constitutive expression plane condition first given. Next, based on Biot's two-phase mixture theory, finite element equations motion during earthquake loadings are derived. simulation shaking table test performed by applying proposed model. The effectiveness examined models...
A large-scale shaking table test has been carried out to investigate the dynamic behavior of a pile model set in flowing soils induced by soil liquefaction. Furthermore, simplified tests have conducted clarify relation between liquefaction potential and drag force acting on piles soils. Experimental results potential: excess pore water pressure ratio external loading liquefied soils: are discussed.
Abstract The cyclic mobility behaviour of sand by the three‐dimensional (3‐D) strain space multimechanism model based on micromechanics granular material is investigated. constitutive properties are characterized volumetric and shear mechanisms for initial isotropic soil. 3‐D mechanism decomposed into a number microscopic plane‐strain in various orientations, each which turn consists simple mechanisms. Using an appropriate summation mechanisms, total deformation can be obtained evaluating...
We present the details of a unique deep-ocean instrument package and mooring that was deployed at Challenger Deep (10,984 m) in Marianas Trench. The is 45 m length consists hydrophone, RBR <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">TM</sup> pressure temperature loggers, nine Vitrovex® glass spheres mast with satellite beacon for recovery. January recovered March 2015 using USCG Cutter Sequoia. logger recorded maximum 10,956.8 decibars,...
The study focuses on the prediction technology of rubber block friction properties ice. 2-D simplified model with sipes (narrow grooves) and mechanical analysis methodology are applied to understand complex tribological phenomena improve winter tire grip icy roads. forces ice assumed consist adhesion force, viscous drag water film, ploughing effects sipe edges. Based this assumption, temperature distribution coefficient in contact patch predicted. density stiffness tread pattern evaluated....
We describe the design of an experiment, carried out in January 1990, to calibrate SeaMARC II bathymetric sidescan sonar system open sea lee Oahu (Waianae coast). A swath ship, SSP Kaimalino (NOSC, Hawaii), was used as a stationary platfonn deploy tow-fish vertically at end steel pipe column. The with its lowered nose up through Kaimalino's center well about 50 meters below water surface. rotation mechanism attached surface column allowed azimuthal control position tow fish. separate...
On 31 May 1998, a moderate-to-strong earthquake (Mw6.1) occurred off Sanriku, Japan. Conventional or traditional tide gauges nearby did not observe any tsunami signal. Two meters (TMs) deployed on the deep ocean-bottom however, could long-period (/spl sim/ several minutes) hydro-pressure change following event. We carry out 3-D numerical computation based hydrodynamic equations to ascertain origin of observed by TMs. assume rectangular fault model, with constant rupture velocity, deduced...
The vertical slices of density profile along the surveying lines provide important information for establishing a countermeasure deterioration coastal marine environments and shoaling waterway or anchorage with drift soft mud such as low consistency clay silt. To detect profiles layer from surface ship, detecting device using wide-band narrow beam underwater acoustic pulses has been developed detection in sea areas several tens meters deep. 3 transducers that transmit receive 25, 71 250 kHz...