A5009810098- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies
- Spacecraft and Cryogenic Technologies
- Offshore Engineering and Technologies
- Astro and Planetary Science
- Geology and Paleoclimatology Research
- Astronomical Observations and Instrumentation
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Planetary Science and Exploration
- Geological Modeling and Analysis
- Geological and Geochemical Analysis
- Hydrocarbon exploration and reservoir analysis
- Geological formations and processes
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Inertial Sensor and Navigation
- High-pressure geophysics and materials
- Reservoir Engineering and Simulation Methods
- Seismic Waves and Analysis
- Drilling and Well Engineering
Discovery Place
2010-2023
Texas A&M University
2010-2023
Mitchell Institute
2023
Expedition (United Kingdom)
2019
International Ocean Discovery Program
2015-2019
Kōchi University
2017
University of California, Santa Cruz
2010
Kyoto Katsura Hospital
2010
Kyoto University
2010
University of New England
1994-1996
International Ocean Discovery Program (IODP) Expedition 352 recovered a high-fidelity record of volcanism related to subduction initiation in the Bonin fore-arc. Two sites (U1440 and U1441) located deep water nearer trench basalts rocks; two (U1439 U1442) shallower further from boninites rocks. Drilling both areas ended dolerites inferred be sheeted intrusive The apparently erupted immediately after have compositions similar those most depleted generated by rapid sea-floor spreading at...
Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) well-documented SSEs Hikurangi zone offshore New Zealand offers unique opportunity to link geophysical imaging with direct access incoming material represents megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this before it entrained...
Plate-boundary fault rupture during the 2004 Sumatra-Andaman subduction earthquake extended closer to trench than expected, increasing and tsunami size. International Ocean Discovery Program Expedition 362 sampled incoming sediments offshore northern Sumatra, revealing recent release of fresh water within deep sediments. Thermal modeling links this freshening amorphous silica dehydration driven by rapid burial-induced temperature increases in past 9 million years. Complete silicates is...
A holistic view of the Bengal–Nicobar Fan system requires sampling full sedimentary section Nicobar Fan, which was achieved for first time by International Ocean Discovery Program (IODP) Expedition 362 west North Sumatra. We identified a distinct rise in sediment accumulation rate (SAR) beginning ∼9.5 Ma and reaching 250–350 m/Myr 9.5–2 interval, equal or far exceed rates on Bengal at similar latitudes. This marked SAR constant Himalayan-derived provenance necessitates major restructuring...
Abstract Geophysical observations show spatial and temporal variations in fault slip style on shallow subduction thrust faults, but geological signatures underlying deformation processes remain poorly understood. International Ocean Discovery Program (IODP) Expeditions 372 375 investigated New Zealand’s Hikurangi margin a region that has experienced both tsunami earthquakes repeated slow-slip events. We report direct from cores sampled the active Pāpaku splay at 304 m below seafloor. This...
Abstract Provenance studies of widely distributed tephras, integrated within a well‐defined temporal framework, are important to deduce systematic changes in the source, scale, distribution, and regional explosive volcanism. Here, we establish robust tephrochronostratigraphy for total 157 marine tephra layers collected during IODP Expedition 352. We infer at least three major phases highly volcanism Oligocene Pleistocene time. analysis based on glass composition assigns 56 tephras Japan...
An increase in the accuracy and age resolution of apparent polar wander path Pacific plate could be important for testing reconstructions that relate motion basin plates to other plates, if hotspots different ocean basins are stationary relative one another, estimating spin axis. With these goals mind, herein we investigate how accurately a palaeomagnetic pole can estimated from skewness analysis many crossings single magnetic anomaly on plate. Apparent effective remanent inclinations...
Abstract The Pāpaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of Hikurangi Margin. In logging‐while‐drilling data, 33‐m‐thick zone exhibits mixed modes deformation associated with a trend downward decreasing density, P ‐wave velocity, and resistivity. Methane hydrate observed from ~30 to 585 m below seafloor (mbsf), including within surrounding zone. Hydrate accumulations are vertically...
New biostratigraphical, geochemical, and magnetic evidence is synthesized with IODP Expedition 352 shipboard results to understand the sedimentary tectono-magmatic development of Izu–Bonin outer forearc region. The oceanic basement was created by supra-subduction zone seafloor spreading during early Eocene (c. 50–51 Ma). Seafloor an irregular topography on which talus locally accumulated. Oxide-rich sediments accumulated above igneous mixing hydrothermal pelagic sediment. Basaltic volcanism...
Glacio-eustatic cycles lead to changes in sedimentation on all types of continental margins. There is, however, a paucity rate data over eustatic sea-level active subduction zones. During International Ocean Discovery Program Expedition 375, coring the upper ∼110 m northern Hikurangi Trough Site U1520 recovered turbidite-dominated succession deposited during last ∼45 kyrs (Marine Isotope Stages (MIS) 1–3). We present an age model integrating radiocarbon dates, tephrochronology, and δ18O...
The asymmetry (skewness) of marine magnetic anomaly 32 (72.1–73.3 Ma) on the Pacific plate has been analysed in order to estimate a new palaeomagnetic pole. Apparent effective remanent inclinations seafloor magnetization were calculated from skewness estimates 108 crossings distributed over entire and spanning great-circle distance ∼12 000 km. data inverted obtain pole at 72.1°N, 26.8°E with 95 per cent confidence ellipse having 4.0° major semi-axis oriented 98° clockwise north 1.8° minor...
We present a method for simultaneously determining palaeomagnetic poles and anomalous skewness from the observed of marine magnetic anomalies single plate. Skewness is esimated by visual comparison phase-shifted anomaly profiles with an ideal zero-phase synthetic calculated sea-floor formed in vertical field. assume that each crossing same or anomalously skewed identical amount. This assumption supported great reduction squared error (i.e.,χ2) obtained adding just this one adjustable...