A5050641220- Geological and Geophysical Studies
- Geomagnetism and Paleomagnetism Studies
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Hydrocarbon exploration and reservoir analysis
- Reservoir Engineering and Simulation Methods
- Geophysical and Geoelectrical Methods
- Geological formations and processes
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Paleontology and Stratigraphy of Fossils
- High-pressure geophysics and materials
- Drilling and Well Engineering
- Astro and Planetary Science
- Hydraulic Fracturing and Reservoir Analysis
- CO2 Sequestration and Geologic Interactions
- Geological and Tectonic Studies in Latin America
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Geological and Geophysical Studies Worldwide
- Offshore Engineering and Technologies
Woods Hole Oceanographic Institution
2010-2024
International Ocean Discovery Program
2024
Expedition (United Kingdom)
2024
Texas A&M University
2010-2022
Michigan State University
2012-2015
Waseda University
2006-2008
University of Southampton
2006
University of California, Santa Barbara
2006
National Oceanography Centre
2006
University of Michigan–Ann Arbor
2006
Sampling an intact sequence of oceanic crust through lavas, dikes, and gabbros is necessary to advance the understanding formation evolution formed at mid-ocean ridges, but it has been elusive goal scientific ocean drilling for decades. Recent in eastern Pacific Ocean Hole 1256D reached gabbro within seismic layer 2, 1157 meters into a superfast spreading rate. The are crystallized melt lenses that beneath ridge. depth which was confirms predictions extrapolated from experiments modern...
[1] Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored logged a 1.4 km section domal core Atlantis Massif. Postdrilling research results summarized here constrain structure lithology Central Dome this oceanic complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application ground truth in subsequent geophysical processing has produced self-consistent models for Dome. presence many thin interfingered petrologic units indicates that...
Abstract Microbathymetry data, in situ observations, and sampling along the 13°20′N oceanic core complexes (OCCs) reveal mechanisms of detachment fault denudation at seafloor, links between tectonic extension mass wasting, expose nature corrugations, ubiquitous OCCs. In initial stages faulting high‐angle fault, scarps show extensive wasting that reduces their slope. Flexural rotation further lowers scarp slope, hinders resulting morphologically complex chaotic terrain breakaway denuded...
Geomagnetic polarity time scales (GPTSs) have been constructed by interpolating between dated marine magnetic anomalies assuming uniformly varying spreading rates. A strategy to obtain an optimal GPTS is minimize rate fluctuations in many ridge systems; however, this has possible only for a few centers. We describe here Monte Carlo sampling method that overcomes limitation and improves accuracy incorporating information on chron durations estimated from astrochronology. The generates large...
Abstract Large explosive volcanic eruptions from island arcs pour pyroclastic currents into marine basins, impacting ecosystems and generating tsunamis that threaten coastal communities infrastructures. Risk assessments require robust records of such highly hazardous events, which is challenging as most the products lie buried under sea. Here we report discovery by IODP Expedition 398 a giant rhyolitic pumice deposit emplaced 520 ± 10 ky ago at water depths 200 to 1000 m during...
Abstract Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest caldera-forming eruption ~1600 bce , Kameni Volcano in southern Aegean Sea enables eruptive evolution a recharging multi-cyclic to be reconstructed. Kameni’s record has been documented by onshore products and historical descriptions mainly...
The Mohns Ridge is located in the Norwegian-Greenland Sea, between Jan Mayen Transform Fault and Mohns-Knipovich Bend. It an ultra-slow spreading ridge section with a full rate of 15 to 17 mm/yr. Over its 580 km, variations axis depth crustal thickness attest overall decrease magma supply associated distance from Hotspot. In parallel seafloor ages based on sediment sedimentation axial valley relatively young volcanic activity (
The objective of this study is to construct a representative volcanostratigraphy Ocean Drilling Program Hole 1256D, the first complete penetration intact upper oceanic crust formed at superfast spreading rate. An accurate knowledge vital understand processes crustal construction and submarine magmatism estimate chemical exchange with seawater, but rarely achieved due very low recovery rates in most basement holes. We used two approaches determine rock types that form wall rocks sections...
The Jurassic Quiet Zone (JQZ) is a region of low‐amplitude magnetic anomalies whose distinctive character may be related to geomagnetic field behavior. We collected deep‐tow profiles in Pigafetta Basin (western Pacific) where previous data partially covered the JQZ sequence. Our goals were extend survey through JQZ, examine anomaly correlations, and refine preliminary polarity timescale (GPTS) model. series closely spaced over M34 Ocean Drilling Program Hole 801C correlation detail, one...
Properly assessing the extent and magnitude of fault ruptures associated with large earthquakes is critical for understanding behavior hazard. Submarine faults can trigger tsunamis, whose characteristics are defined by geometry seafloor displacement, studied primarily through indirect observations (e.g., seismic event parameters, profiles, shipboard bathymetry, coring) rather than direct ones. Using deep-sea vehicles, we identify first time a marker coseismic slip on submarine plane along...
Research Article| September 01, 2006 Origin of the Pacific Jurassic quiet zone Maurice A. Tivey; Tivey 1Department Geology and Geophysics, Woods Hole Oceanographic Institution, Hole, Massachusetts 02543, USA Search for other works by this author on: GSW Google Scholar William W. Sager; Sager 2Department Oceanography, Texas A&M University, College Station, 77843, Sang-Mook Lee; Lee 3School Earth Environmental Sciences, Seoul National Sillim-dong, Gwanak-gu, 151-747, Korea Masako Tominaga...
The current M-anomaly geomagnetic polarity timescale (GPTS) is mainly based on the Hawaiian magnetic lineations in Pacific Ocean. GPTS studies to date have relied a small number of profiles, situation that not ideal because any one profile contains an uncertain amount geologic ‘noise’ perturbs field signal. Compiling sequence from larger array profiles desirable provide greater consistency and repeatability. We present new compilation constructed models derived crossing three lineation sets...
We examine shipboard physical property measurements, wireline logs, and vertical seismic profiles (VSP) from Ocean Drilling Program/Integrated Program Hole 1256D in 15 Ma ocean crust formed at superfast spreading rates to investigate lateral variations compressional velocity. In general, velocities all methods agree. Porosity is inversely related velocity both the logging laboratory data. infer that microfracturing during drilling minor upper 1 km of basement, probably due connected pores...
Abstract Peridotite carbonation represents a critical step within the long-term carbon cycle by sequestering volatile CO 2 in solid carbonate. This has been proposed as one potential pathway to mitigate effects of greenhouse gas release. Most our current understanding reaction mechanisms is based on hand specimen and laboratory-scale analyses. Linking observations field scale processes remains challenging. Here we present first geophysical characterization serpentinite across scales ranging...
Pythia's Oasis is a newly discovered seafloor seep on the Central Oregon segment of Cascadia Subduction Zone, where focused venting emits highly altered fluids ~9°C above background temperature. The fluid chemistry unique for and includes extreme enrichment boron lithium depletion chloride, potassium, magnesium. We conclude that are sourced from pore water compaction mineral dehydration reactions with minimum source temperatures 150° to 250°C, placing at or near plate boundary offshore...
Understanding how pelagic sediment has been eroded, transported, and deposited is critical to evaluating records for paleoceanography. We use digital seismic reflection data from an Integrated Ocean Drilling Program site survey (AMAT03) investigate sedimentation across the eastern‐central equatorial Pacific, which represents first comprehensive record published covering 18–53 Ma eastern Pacific. Our goals are quantify (1) basin‐hill‐scale primary deposition regimes (2) extent seafloor...