Index Catalog // ScholarsArchive@OSU

Crystal structure of the northwestern Vizcaino block and Gorda Escarpment, offshore northern California, and implications for postsubduction deformation of a paleoaccretionary margin

Creator:: Leitner, Beate, Tréhu, Anne Martine, and Godfrey, Nicola
Abstract:: The Vizcaino block is an anomalously shallow region of the western U.S continental margin located southwest of the Mendocino triple junction. It originated as part of the accretionary prism of the North America plate and was transferred to the Pacific plate in the Miocene as the Pacific-North America plate boundary...
Resource Type:: Article
Full Text:: 80 LINE 5 LINE 3 i , 1 •, I I •1 I 1', ,, , , !, •1o m 15 • 20 25 . 0 10 20 30 40 50 60

Crystal structure beneath the central Oregon convergent margin from potential-field modeling: Evidence for a buried basement ridge in local contact with a seaward dipping backstop

Creator:: Fleming, Sean W. and Tréhu, Anne Martine
Abstract:: Models of magnetic and gravity anomalies along two E-W transects offshore central Oregon, one of which is coincident with a detailed velocity model, provide quantitative limits on the structure of the subducting oceanic crust and the crystalline backstop. The models indicate that the backstop-forming western edge of the Siletz terrane,...
Resource Type:: Article
Full Text:: _ ' . -,, . ;•, .... : .... '; ..'..' .................... • • , •,_.•:•;g• .... 48ø ::::::::::::½:::;½:: :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ß I

Crustal structure beneath the Strait of Juan de Fuca and southern Vancouver Island from seismic and gravity analyses

Creator:: Graindorge, D., Spence, G., Charvis, P., Collot, J. Y., Hyndman, R., and Tréhu, Anne Martine
Abstract:: Wide-angle and vertical incidence seismic data from Seismic Hazards Investigations in Puget Sound (SHIPS), gravity modeling, and seismicity are used to derive two-dimensional crustal models beneath the Strait of Juan de Fuca. The Eocene volcanic Crescent-Siletz terrane is significantly thicker than previously recognized and extends from near the surface to...
Resource Type:: Article

Upward shifts in the southern Hydrate Ridge gas hydrate stability zone following postglacial warming, offshore Oregon

Creator:: Bangs, Nathan Lawrence Bailey, Musgrave, Robert J., and Tréhu, Anne Martine
Abstract:: High‐resolution three‐dimensional (3‐D) seismic reflection data acquired on the R/V Thomas G. Thompson in 2000 reveal a pair of bottom simulating reflections (BSRs) across a broad region of southern Hydrate Ridge, offshore Oregon. The primary BSR (BSRp) is a regionally extensive reflection that lies 120–150 m below seafloor and exhibits...
Resource Type:: Article
Full Text:: methane hydrate stability field for structure I hydrates to within the limits of instrument errors. We

Seismic sequence stratigraphy and tectonic evolution of Southern Hydrate Ridge

Creator:: Chevallier, Johanna, Tréhu, Anne Martine, Bangs, Nathan Lawrence Bailey, Johnson, Joel E., and Meyer, H. Jack
Abstract:: This paper presents a seismic sequence and structural analysis of a high-resolution three-dimensional seismic reflection survey that was acquired in June 2000 in preparation for Ocean Drilling Program (ODP) Leg 204. The seismic data were correlated with coring and logging results from nine sites drilled in 2002 during Leg 204....
Resource Type:: Article
Full Text:: OF SOUTHERN HYDRATE RIDGE Tréhu, A.M., Bohrmann, G., Torres, M.E., and Colwell, F.S. (Eds

Seismic attribute inversion for velocity and attenuation structure using data from the GLIMPCE Lake Superior experiment

Creator:: Matheney, Michael P., Nowack, Robert L., and Tréhu, Anne Martine
Abstract:: A simultaneous inversion for velocity and attenuation structure using multiple seismic attributes has been applied to refraction data from the 1986 GLIMPCE Lake Superior experiment. The seismic attributes considered include envelope amplitude, instantaneous frequency, and travel time of first arrival data. Instantaneous frequency is converted to t* using a matching...
Resource Type:: Article
Full Text:: frequency- 9949 9950 MATHENEY ET AL.: SEISMIC ATTRIBUTE INVERSION 92 ø ..I i,'•/i' 48 ø

Transpression between two warm mafic plates: The Queen Charlotte Fault revisited

Creator:: Rohr, Kristin M. M., Scheidhauer, Maren, and Tréhu, Anne Martine
Abstract:: The Queen Charlotte Fault is a transpressive transform plate boundary between the Pacific and North American plates offshore western Canada. Previous models for the accommodation of transpression include internal deformation of both plates adjacent to the plate boundary or oblique subduction of the oceanic plate; the latter has been the...
Resource Type:: Article
Full Text:: ); Gradient (km/slkm) [• 1.49; 0,001 ,[• 2.20; 0.530 I• 2.35; 0.700 • 3.80; 0.350 3.80; 0.350

Feeding methane vents and gas hydrate deposits at south Hydrate Ridge

Creator:: Tréhu, Anne Martine, Flemings, Peter B., Bangs, Nathan Lawrence Bailey, Chevallier, Johanna, Gracia, Eulalia, Johnson, Joel E., Liu, C. S., Liu, Xiaoli, Riedel, Michael, and Torres, Marta E.
Abstract:: Log and core data document gas saturations as high as 90% in a coarse-grained turbidite sequence beneath the gas hydrate stability zone (GHSZ) at south Hydrate Ridge, in the Cascadia accretionary complex. The geometry of this gas-saturated bed is defined by a strong, negative-polarity reflection in 3D seismic data. Because...
Resource Type:: Article
Full Text:: Hydrate Ridge, OR, I: Hydrological provinces, Earth Planet. Sci. Lett., 201, 525–540. Torres, M. E., K

A seismic reflection profile across the Cascadia subduction zone offshore central Oregon: New constraints on methane distribution and crystal structure

Creator:: Tréhu, Anne Martine, Lin, Guibiao, Maxwell, Edward, and Goldfinger, Chris
Abstract:: In 1989, we conducted an onshore/offshore seismic experiment to image the crustal structure of the Cascadia forearc. In this paper, we discuss the processing and interpretation of a multichannel seismic reflection profile across the continental margin that was collected as part of this effort. This profile reveals several features of...
Resource Type:: Article
Full Text:: 10000 9000 8000 7000 6000 5000 0 i i i i i i CMP 5000 4000 3000 2000 1000 EAST 0 I I I I I I 8 i m

Seismic and seafloor evidence for free gas, gas hydrates, and fluid seeps on the transform margin offshore Cape Mendocino

Creator:: Tréhu, Anne Martine, Stakes, Debra S., Bartlett, Cindy D., Chevallier, Johanna, Duncan, Robert A., Goffredi, Shana K., Potter, Susan M., and Salamy, Karen A.
Abstract:: Seismic data and seafloor samples indicate the presence of free gas, gas hydrate, and fluid seeps south of the Gorda Escarpment, a topographic feature that marks the eastern end of the Gorda/Pacific transform plate boundary southwest of Cape Mendocino, California. In spite of high sedimentation rates and high biological productivity,...
Resource Type:: Article
Full Text:: /fluid system, and y is depth beneath the surface. In case I, flow is assumed to initiate where Tr� To is

ScholarsArchive@OSU

Crystal structure of the northwestern Vizcaino block and Gorda Escarpment, offshore northern California, and implications for postsubduction deformation of a paleoaccretionary margin

Crystal structure beneath the central Oregon convergent margin from potential-field modeling: Evidence for a buried basement ridge in local contact with a seaward dipping backstop

Crustal structure beneath the Strait of Juan de Fuca and southern Vancouver Island from seismic and gravity analyses

Upward shifts in the southern Hydrate Ridge gas hydrate stability zone following postglacial warming, offshore Oregon

Seismic sequence stratigraphy and tectonic evolution of Southern Hydrate Ridge

Seismic attribute inversion for velocity and attenuation structure using data from the GLIMPCE Lake Superior experiment

Transpression between two warm mafic plates: The Queen Charlotte Fault revisited

Feeding methane vents and gas hydrate deposits at south Hydrate Ridge

A seismic reflection profile across the Cascadia subduction zone offshore central Oregon: New constraints on methane distribution and crystal structure

Seismic and seafloor evidence for free gas, gas hydrates, and fluid seeps on the transform margin offshore Cape Mendocino

Limit your search

Academic Affiliation

Creator

Date

Decade

File Format

Language

Peer Reviewed

Resource Type

Rights Statement

Subject

Search Constraints

Search Results

Limit your search