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Creator:: Tréhu, Anne Martine
Abstract:: During Ocean Drilling Program Leg 204, 80 in situ measurements of subseafloor temperature were made; 68 of these showed good frictional pulses on insertion and extraction from the seafloor and were used to constrain the subsurface temperature. Considering uncertainties from various sources, uncertainties in the in situ temperatures are estimated...
Resource Type:: Article
Full Text:: RIDGE Tréhu, A.M., Bohrmann, G., Torres, M.E., and Colwell, F.S. (Eds.) Proceedings of the Ocean

Creator:: Tréhu, Anne M.
Abstract:: Several approaches to interpreting the Cascadia paleoseismic record are used to derive relationships between fault area, slip, and moment and to compare the results with the scaling relationships determined by Somerville et al. (2015) for recent subduction-zone events. In two models (CA12a and CA12b), taken from Goldfinger et al. (2012),...
Resource Type:: Article

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,...
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Full Text:: . Fleming 1 and Anne M. Tr•hu College of Oceanic and Atmospheric Sciences, Oregon State University

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...
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Full Text:: Anne M. Tr6hu College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis Nicola

Creator:: Tréhu, Anne Martine, Bangs, Nathan Lawrence Bailey, and Guerin, Gilles
Abstract:: Three successful vertical seismic profiles (VSPs) were acquired during Ocean Drilling Program (ODP) Leg 204 at South Hydrate Ridge. The data confirm earlier results from ocean bottom seismometer data and analysis of moveout from common midpoint reflection data that the average velocity between the seafloor and the bottom-simulating reflector (BSR)...
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Full Text:: DURING LEG 2041 Anne M. Tréhu,2 Nathan L. Bangs,3 and Gilles Guerin4 ABSTRACT Three successful

Creator:: Tréhu, Anne M., Blakely, Richard J., and Williams, Mark C.
Abstract:: Bathymetry and magnetic anomalies indicate that a seamount on the Juan de Fuca plate has been subducted beneath the central Cascadia accretionary complex and is now located similar to 45 km landward of the deformation front. Passage of this seamount through the accretionary complex has resulted in a pattern of...
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Full Text:: 2012;40;103-106Geology Anne M. Tréhu, Richard J. Blakely and Mark C. Williams forearc Subducted seamounts

Creator:: Tréhu, Anne Martine, Torres, Marta E., Bohrmann, G., and Colwell, Frederick
Abstract:: Ocean Drilling Program (ODP) Leg 204 to Hydrate Ridge, located on the continental slope offshore Oregon (USA), was the first drilling expedition dedicated to understanding gas hydrate processes in accretionary complexes and provided a testbed for a number of different techniques for estimating the gas hydrate content of sediments. It...
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Full Text:: DYNAMICS IN THE CENTRAL CASCADIA ACCRETIONARY COMPLEX Tréhu, A.M., Bohrmann, G., Torres, M.E., and

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...
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Full Text:: Trobe University, Bundoora, Victoria, Australia Anne M. Tréhu College of Oceanic and Atmospheric

Creator:: Calvert, Andrew J., Fisher, Michael A., Ramachandran, Kumar, and Tréhu, Anne Martine
Abstract:: Seismic reflection profiles shot across the Cascadia forearc show that a 5–15 km thick band of reflections, previously interpreted as a lower crustal shear zone above the subducting Juan de Fuca plate, extends into the upper mantle of the North American plate, reaching depths of at least 50 km. In...
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Full Text:: , Canada Anne M. Tréhu College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis

Creator:: Braunmiller, Jochen, Nábělek, John L., and Tréhu, Anne M.
Abstract:: From December 2006 to November 2011, the Pacific Northwest Seismic Network (PNSN) reported 467 earthquakes in a swarm 60 km east of Mt Hood near the town of Maupin, Oregon. The swarm included 20 M[subscript D] ≥ 3.0 events, which account for over 80 per cent of the cumulative seismic...
Resource Type:: Article
Full Text:: Braunmiller,∗ John L. Nábělek and Anne M. Tréhu College of Earth, Ocean and Atmospheric Sciences, Oregon

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