A5087393901- earthquake and tectonic studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Seismic Waves and Analysis
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Geological and Tectonic Studies in Latin America
- Reservoir Engineering and Simulation Methods
- Geology and Paleoclimatology Research
- Seismology and Earthquake Studies
- Geological Modeling and Analysis
- Landslides and related hazards
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Geologic Mapping
- Drilling and Well Engineering
- Geomagnetism and Paleomagnetism Studies
- Offshore Engineering and Technologies
- Geophysical and Geoelectrical Methods
- Hydraulic Fracturing and Reservoir Analysis
- Polar Research and Ecology
- Millimeter-Wave Propagation and Modeling
The University of Texas at Austin
2016-2025
University of Texas Institute for Geophysics
2013-2024
Western Washington University
2023
University of Wyoming
2001-2004
Czech Academy of Sciences, Institute of Geophysics
1998
Scripps Institution of Oceanography
1998
Utrecht University
1994
We present a two‐dimensional velocity model to constrain crustal thickness and composition of the Yakutat terrane in northern Gulf Alaska. The was constructed using seismic reflection refraction data along ∼455 km onshore‐offshore profile. Our shows that crystalline crust composing is wedge‐shaped, with increasing west east from ∼15 ∼30 km. Crustal structure are continuous across terrane, lower velocities >7 km/s, suggesting an oceanic plateau its entire offshore extent rather than...
Abstract We use offshore multichannel seismic (MCS) reflection and wide‐angle data sets to model the velocity structure of incipient arc‐continent collision along two trench perpendicular transects in Bashi Strait between Taiwan Luzon. This area represents a transition from tectonic regime dominated by subduction oceanic crust South China Sea, west Philippines, one eventual rifted Chinese continental with Luzon volcanic arc culminating orogeny. The new models show evidence for extended...
The Cocos plate experiences extensional faulting as it bends into the Middle American Trench (MAT) west of Nicaragua, which may lead to hydration subducting mantle.To estimate along strike variations volatile input from subduction zone, we gathered marine seismic refraction data with R/V Marcus Langseth a 396 km long trench parallel transect offshore Nicaragua and Costa Rica.Our inversion crustal mantle phases shows two notable features in deep structure plate: (1) Normal oceanic crust 6...
We present new constraints on the crustal structure of Yakutat terrane and evidence role Transition fault in southern Alaska. The south Bay includes crystalline crust that is 24–27 km thick overlain by sedimentary units are 4.5–7.5 thick. thickness velocity consistent with an oceanic plateau origin. edge bounded fault, which imaged as a near-vertical zone ∼1 wide. coincident dramatic change Moho depth from 32 for to 11.5 Pacific Ocean occurring over horizontal distance 0–5 km. There no...
Abstract We present a new travel time tomography velocity model and seismic reflection images that delineate the rift architecture magmatic features of rifted margin in northeastern South China Sea. These data reveal moderately stretched crust ~25 km thick along continental shelf thin but laterally variable crustal thickness distal margin. Along slope, rapidly thins to ~4 basin characterized by tilted fault blocks sole into low‐angle detachment. Strain was localized degree within highly...
Research Article| August 01, 2013 Inversion of a hyper-extended rifted margin in the southern Central Range Taiwan Kirk McIntosh; McIntosh 1Institute for Geophysics, University Texas at Austin (R2200), 10100 Burnet Road, Austin, 78758-4445, USA Search other works by this author on: GSW Google Scholar Harm van Avendonk; Avendonk Luc Lavier; Lavier W. Ryan Lester; Lester Daniel Eakin; Eakin Francis Wu; Wu 2Department Geologic Sciences, State New York Binghamton, Vestal Parkway E., 13902-6000,...
We present a compressional seismic velocity profile of the crust eastern margin Grand Banks Newfoundland, Canada. This model was obtained by tomographic inversion wide‐angle data recorded on linear array 24 ocean bottom seismometers (OBSs). At landward side, we imaged crustal thickness 27 km in Flemish Pass and beneath Beothuk Knoll, which is thinner than 35‐km‐thick central Banks. therefore assume that rim stretched uniformly 25%. Farther seaward, continental tapers rapidly slope to ∼6...
Abstract We image deep crustal structure using marine seismic refraction data recorded by a linear array of ocean‐bottom seismometers in the Gulf Mexico Basin Opening project (GUMBO Line 3) order to provide new constraints on nature continental and oceanic crust northeastern Mexico. GUMBO 3 extends ~524 km from shelf offshore Pensacola, Florida, across De Soto Canyon into central basin. Travel times long offset, wide angle reflections refractions resolve compressional velocities layer...
Abstract We use air gun data recorded by ocean bottom seismometers to constrain the velocity structure along Gulf of Mexico Basin Opening Line 4, a profile extending from northwestern Florida peninsula across Escarpment central Mexico. Moderately thinned continental crust with Moho depth 32–33 km, average sediment thickness 6 and an crustal 27 km is interpreted on northeast end offshore Florida. Thinned intruded identified over horizontal distance 225 where layer thins 25 6–7 km; mean...
Research Article| July 01, 2015 Continental rifting and sediment infill in the northwestern Gulf of Mexico Harm J.A. Van Avendonk; Avendonk University Texas Institute for Geophysics, 10100 Burnet Road, Austin, 78758, USA Search other works by this author on: GSW Google Scholar Gail L. Christeson; Christeson Ian O. Norton; Norton Drew R. Eddy *Current address: BHP Billiton, 1360 Post Oak Boulevard, Houston, 77056, Author Article Information Publisher: Geological Society America Received: 19...
Abstract The depth of earthquakes along mid-ocean ridges is restricted by the relatively thin brittle lithosphere that overlies a hot, upwelling mantle. With decreasing spreading rate, may occur deeper in lithosphere, accommodating strain within thicker layer. New data from ultraslow-spreading Mid-Cayman Spreading Center (MCSC) Caribbean Sea illustrate to 10 km below seafloor and, hence, than most other slow-spreading ridges. MCSC spreads at 15 mm/yr full while similarly well-studied...
New results from wide‐angle seismic data collected parallel to the central Aleutian island arc require an intermediate mafic composition for middle crust and a ultramafic lower yield lateral velocity variations that correspond segmentation trends in major element geochemistry. The 3‐D ray tracing/2.5‐D inversion of this sparse set, which incorporates independent phase interpretations new constraints on shallow structure, produces faster smoother result than previously published model....
Compressional seismic travel times from a relatively sparse wide‐angle data set hold key information on the structure of 800 km long section central Aleutian arc. Since source and receiver locations form swath along arc crest that is ∼50 wide, we trace rays in 3‐D for collection 8336 refraction reflection arrivals. We investigate variations velocity parallel to arc, assuming our result represents average crustal across explore models consist three layers exhibit smooth 2‐D vertical plane....
From the marine refraction data recorded on five instruments during Clipperton Area Seismic Survey to Investigate Compensation (CLASSIC) experiment in 1994 we construct a compressional velocity model for 108 km long profile across transform. We apply new seismic tomography code that alternates between ray tracing and linearized inversions find smooth fits observed travel times. The solution forward ray‐tracing problem is hybrid of graph (or shortest path) method ray‐bending method. inversion...
The 1996 South Island Geophysical Transect (SIGHT) active source seismic survey was designed to show the style of lithospheric thickening due late Cenozoic oblique convergence across Australian‐Pacific plate boundary in New Zealand. As part this study, two refraction lines were shot central and offshore extensions continental crust Tasman Sea Pacific Ocean. We present data a 603 km long velocity profile uppermost mantle along one these transects. A tomographic inversion 62,563 travel times...
Abstract Investigations of tectonic and surface processes have shown a clear relationship between climate‐influenced erosion long‐term exhumation rocks. Numerical models suggest that most orogens are in transient state, but observational evidence spatial shift mountain building due to tectonic‐climate interaction is missing. New thermochronology data synthesized with geophysical process elucidate the evolving interplay tectonics colliding Yakutat microplate North America. Focused deformation...
Abstract Four decades of seismic reflection, onshore‐offshore and ocean‐bottom data are integrated to constrain a high‐resolution 3‐D P‐wave velocity model the Hikurangi subduction zone. Our shows wavespeeds in offshore forearc be 0.5–1 km/s higher south than central northern segments ( V P ≤ 4.5 km/s). Correlation with onshore geology reflection sets suggest wavespeed variability overthrusting plate reflects spatial distribution Late Jurassic basement terranes. The crustal backstop is 25–35...
Prestack depth migrations of seismic reflection data collected around the Ocean Drilling Program (ODP) Leg 210 transect on Newfoundland nonvolcanic margin delineate three domains: (1) extended continental crust, (2) transitional basement, and (3) apparent slow spreading oceanic basement beyond anomaly M3 indicate first‐order differences between this its well‐studied conjugate, Iberia margin. Extended crust thins abruptly with few observed faults, in stark contrast system seaward dipping...