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    Anne Trehu

    Anne Trehu photo
    Discipline: Geology and Geophysics
    Office: Weniger 521
    Phone: 541-737-2655 / 541-737-2847
    Fax: 541-737-2064
    Email: trehu@coas.oregonstate.edu

    Research Interests

    Application of geophysical data to geodynamic processes along plate boundaries; gas hydrate distribution and dynamics; seismic data acquisition and processing.

    Current Research

    Structure of the crust and lithosphere of the Cascadia subduction zone from active source seismic and potential field data; tectonics and evolution of the Mendocino triple junction region; gas hydrate distribution and dynamics and implications for heat flow and plate boundary slip on the Cascadia and Hikurangi continental margins; post-seismic deformation of the outer accretionary complex and the relationship between crustal structure and slip during large plate-boundary earthquakes offshore Chile.

    Velocity structure and tectonics of western North America - With several major deep crustal multichannel and large-aperture seismic experiments scheduled for summer 2012, we will be acquiring the first new deep crustal imaging data from the outer Cascadia forearc since 1999! Between 1986 and 1999, I collaborate with the U.S. Geological Survey and several other universities and research institutions to acquire a network of seismic 2-D and 3-D seismic images of the the crust and upper mantle of the western north American continental margin in order to understand the plate interactions along the transform and subduction plate boundaries that control the geologic evolution and seismic hazards in this region. I have also acquired deep crustal imaging data from rift zones beneath Lake Superior, the Ross Sea (Antarctica), and the US Atlantic and Gulf of Mexico continental margins, and from the San Andreas and Queen Charlotte transform faults.

    Plate boundary megathrust processes - In recent years, I have returned to my "roots" by working with natural sources of seismic data recorded on ocean bottom seismometers (OBS). My PhD was on microearthquakes in the Orozco transform fault. At the time, OBSs could only record for a few weeks and were limited to short period sensors. Now instruments can record signals from broadband seismometers autonomously for up to a year. I recently completed a 2 year OBS deployment on the central Oregon margin and will be deploying instruments for a 1-year-long experiment on the continental margin of Chile up-dip of the region of greatest slip during the 2010 M8.8 Maule earthquake. We are interested in understanding why this part of the margin did not slip during the earthquake.

    Gas hydrates on the Oregon continental margin - While the presence of gas hydrates on continental margins has been known for several decades, in the past few years hydrates have become a major internation research focus because of the recognition that they may play a significant role in sudden global climate change and slope stability, and may represent a major energy source for the future. I have participated in several cruises to observe and sample gas hydrates on the Cascadia margin and to image their subsurface distribution and the structures feeding these deposits.

    EarthScope - I directed the first university-based EarthScope National Office from 2007 to 2011. In 2011, the EarthScope National Office moved to Arizona State University, leaving me more time for EarthScope-related research, including the Cascadia Initiative Community Experiment.

    EarthScope National Office
    Cascadia Initiative
    ODP Leg 204 - gas hydrates on the Oregon margin
    Other Projects and General Information about OSU Seismology


    BA, Princeton University (Geosciences, summa cum laude), 1975
    PhD, MIT-WHOI Joint program (Marine Geophysics), 1982
    NRC postdoctoral fellow at USGS, Woods Hole MA, 1982-1884


    Tréhu, A.M., Braunmiller, J., Davis, E., Seismicity of the central Cascadia continental margin near 44.5°N - a decadal view, Seis. Res. Lett., in press.

    Walton, M.A.L., Gulick, S.P.S., Haeussler. P.J., Roland, E.C., Tréhu, A.M., Basement and regional structure along-strike of the Queen Charlotte Fault in the context of modern and historical earthquake ruptures, in review, Bull. Seis. Soc. Am, in press.

    Tréhu, A.M., Schiedhauer, M., Rohr, K.M.M., Tikoff, B., Walton, M.A.L., Gulick, S.P.S., Roland, E.C., An abrupt transition in the mechanical response of the upper crust to transpression along the Queen Charlotte Fault, Bull. Seis. Soc. Am., in press.

    Maksymowicz, A., Tréhu, A.M., Contreras-Reyes, E., Ruiz, S., Density-depth model of the continental wedge at the maximum slip segment of the Maule Mw8.8 megathrust earthquake, Earth Plan. Sci. Lett., v. 409, 265-277, 2015.

    Toomey, D.R., R.M. Allen, A.H. Barclay, R.P. Dziak, and A.M. Tréhu, The Cascadia Initiative: a sea change in seismological studies of subduction zones. Oceanography, v. 27, no. 2, doi:10.5670/oceanog.2014.49, 2014.

    Braunmiller, J., Nabelek, J.L., Tréhu, A.M., A Seasonally Modulated Earthquake Swarm Near Maupin, Oregon, Geophys. J, Int., doi:10.1093/gji/ggu081, 2014.

    Kannberg, P.K., Tréhu, A.M., Pierce, S.D., Paull, C.K., Caress, D.W., Temporal variation of methane flares on the ocean above Hydrate Ridge, Oregon, Earth Plan. Sci. Lett., v. 368, p. 33-42, 2013.

    Holbrook, W.S., Kent, G., Keranen, K., Johnson, H.P., Tréhu, A., Tobin, H., Caplan-Auerbach, Beeson, J., Cascadia forearc seismic survey: open-access data available, EOS, Trans. Am. Geophys. Soc., v. 93, p. 521-522, 11 Dec. 2012.

    Bostock, M.G., Tréhu, A.M., Wavefield decomposition of ocean bottom seismograms, Bull. Seis. Soc. Am., v. 102, p. 1681-1692, 2012.  doi:10.1785/0120110162

    Tréhu, A.M., Blakely, R.J., Williams, M.C., Subducted seamounts and recent earthquakes beneath the central Cascadia forearc, Geology, v. 40, p. 103-106, 2012.

    Weitemeyer, K., Constable, S., Tréhu, A.M., A marine electromagnetic survey to detect gas hydrate at Hydrate Ridge, Oregon, Geophysical Journal International, v. 187, p. 45-62, 2011.

    Williams, M.C., Tréhu, A.M., Braunmiller, J., Seismicity at the Cascadia plate boundary beneath the Oregon continental shelf, Bull. Seis. Soc. Am., v. 101, p. 940-950, 2011.

    Villinger, H., Tréhu, A.M, and Grevemeyer, I., Seafloor marine heat flux measurements and estimation of heat flux from seismic observations of bottom simulating reflectors, in press, SEG special volume on geophysics and gas hydrates, December, 2010.

    Long, P., Holland, M., Schultheiss, P., Riedel, M., Weinberger, J, Tréhu, A., Schaef, H, Infrared (IR) imaging of gas hydrate-bearing cores: state-of-the-art and future prospects, SEG special volume on geophysics and gas hydrates, 2010.

    Gomberg, J. and the Cascadia 2007 and beyond working group, Slow-slip phenomena in Cascadia from 2007 and beyond: a review, Geol. Soc. Of Am. Bull, July/August, 2010.

    Torres, M.E., Tréhu, A.M., Cespedes, N., Kastner, M., Wortmann, U.G., Kim, J-H., Long, P., Malinverno, A., Torres, M. E., R. W. Embley, S. G. Merle, A. M. Tréhu, R. W. Collier, E. Suess, and K. U. Heeschen, Methane sources feeding cold seeps on the shelf and upper continental slope off central Oregon, USA, Geochem. Geophys. Geosyst., 10, Q11003, doi:10.1029/2009GC002518, 2009.

    Riedel, M., Tréhu, A.M., and Spence, G.D., Characterizing the thermal regime of cold vents at the northern Cascadia margin from bottom-simulating reflector distributions, heat-probe measuremernts, and borehole temperture data.,Marine Geophys. Researches., v. 31, p. 1-16, 2010.

    Gomberg, J., Tréhu, A.M., Roeloffs, E., Dragert, H., 2008, Understanding slow slip, tremor and quakes, EOS, Trans. Am. Geophys. Un., v. 89, no. 34, p. 315.

    Gomberg, J., Roeloffs, E, Tréhu, A., Dragert, H., Meertens, C., Report on the “Aseismic Slip, Tremor, and Earthquakes” Workshop, USGS Report Series 2008-1343, 75 pp., http://pubs.usgs.gov/of/2008/1343/of2008-1343.pdf

    Tréhu, A.M., Braunmiller, J., Nabelek, J.L., Probable low-angle thrust earthquakes on the Juan de Fuca-North America plate boundary, Geology, v. 36, p. 127-130, 2008.

    Torres, M.E., Tréhu, A.M., Cespedes, N., Kastner, M., Wortmann, U.G., Kim, J-H., Long, P., Malinverno, A., Pohlmann, J., Riedel, M., Collett, T., Methane hydrate formation in turbidite sediments of northern Cascadia, IODP Expedition 311, Earth Plan. Sci. Lett, v. 271, p. 170-180, 2008.

    Snelson, C.M., Brocher, T.M., Miller, K.C., Pratt, T.L., Tréhu, A.M., Seismic amplification within the Seattle Basin, Washington State: Insights from SHIPS seismic tomography experiments, Bull. Seis. Soc. Am., v. 97, pp. 1432-1448, 2007.

    Heeseman, M., H. Villinger, A.T. Fisher, A.M. Tréhu, S. Witte, 2006 Data report: testing and deployment of the new APCT-3 tool to determine in situ temrpatures while piston coring, in Riedel, M., T.S. Collett, M.J. Malone, and the Expedition 311 Scientists, Proc. Integrated Ocean Drilling Program, vol. 311.

    Tréhu, A.M., 2006, Subsurface temperatures beneath southern Hydrate Ridge, in Tréhu, A.M., Bohrmann, G. Torres, M.E., and Colwell, F.S. (eds.), Proc. Ocean Drilling Prog., Scientific Results, v. 204, College Station, TX (Ocean Drilling Program). 1-26, doi:10.2973/odp.proc.sr.204.114.2006.

    Tréhu, A.M., Bangs, N.L., Guerin, G., 2006, Near-offset vertical seismic experiments during Leg 204, in press, in Tréhu, A.M., Bohrmann, G. Torres, M.E., and Colwell, F.S. (eds.), Proc. Ocean Drilling Prog., Scientific Results, v. 204, College Station, TX (Ocean Drilling Program). 1-23, doi:10.2973/odp.proc.sr.204.120.2006.

    Chevallier, J., Tréhu, A.M., Bangs, N.L., Johnson, J.E., Meyer, H.J., 2006, Seismic sequence stratigraphy and tectonic evolution of southern Hydrate Ridge, in press, in Tréhu, A.M., Bohrmann, G. Torres, M.E., and Colwell, F.S. (eds.), Proc. Ocean Drilling Prog., Scientific Results, v. 204, College Station, TX (Ocean Drilling Program). 1-29, doi:10.2973/odp.proc.sr.204.121.2006.

    Tréhu, A.M., Torres, M.E., Bohrmann, G., Colwell, F.S., 2006, Leg 204 Synthesis: Gas hydrate distribution and dynamics in the central Cascadia accretionary complex, in Tréhu, A.M., Bohrmann, G. Torres, M.E., and Colwell, F.S. (eds.), Proc. Ocean Drilling Prog., Scientific Results, v. 204, College Station, TX (Ocean Drilling Program). 1-40, doi:10.2973/odp.proc.sr.204.101.2006.

    Tréhu, A.M., Ruppel, C., Dickens, G.R., Holland, M. Torres, M.E., Collett, T.S., Goldberg. D., Riedel, M., Schultheiss, P., Gas hydrates in marine sediments: lessons from scientific drilling, Oceanography, Dec, 2006.

    Tréhu, A.M., Bohrmann, G. Torres, M.E., and Colwell, F.S. (eds.), 2006, Proc. Ocean Drilling Prog., Scientific Results, v. 204, College Station, TX (Ocean Drilling Program). doi:10.2973/odp.proc.sr.204.2006.

    Bangs, N.L., R.J. Musgrave, A.M. Tréhu, 2005, Upward shifts in the south Hydrate Ridge gas hydrate stability zone following post-glacial warming offshore Oregon, J. Geophys. Res., v. 110, B03102, doi:10.1029/2004JB003293.

    Tréhu, A.M., Bohrman, G., Rack, F.R., Collett, T.S., D.S. Goldberg, P.E. Long, A.V. Milkov, M. Riedel, P. Schultheiss, M.E. Tores, N.L. Bangs, S.R. Barr, W.S. Borowski, G.E. Claypool, M.E. Delwiche, G.R. Dickens, E. Gracia, G. Guerin, M. Holland, J.E. Johnson, Y-J. Lee, C-S. Liu, X. SU, B. Teichert, H. Tomaru, M. Vanneste, M. Watanabe, J.L. Weinberger, 2004. Three-dimensional distribution of gas hydate beneath southern Hydrate Ridge: constraints from ODP Leg 204, Earth and Plan. Sci. Let, v. 222, p. 845-862, 2004..

    Torres, M.E., K. Wallmann, A.M. Tréhu, G. Bohrmann, W.S. Borowski, H. Tomaru, Gas hydrate dynamics at the Hydrate Ridge southern summit based on dissolved chloride data, Earth and Plan. Sci. Let., v. 226, p. 225-241, 2004.

    Torres, M.E., B. Teichert, A. M. Tréhu, W. Borowski and H. Tomaru. 2004, Relationship of pore water freshening to accretionary processes in theCascadia margin: Fluid sources and gas hydrate abundance, Geophys. Res. Let.. v.31, L22305, doi:10.1029/2004GL021219.

    Tréhu, A.M., P. Flemings, N. Bangs, J. Chevallier, E. Gracia, J. Johnson, M. Riedel, C-S Liu, X. Liu, M. Riedel, M.E. Torres, 2004, Feeding methane vents and gas hydrate deposits at south Hydrate Ridge, GRL, v. 31, L23310, doi:10.1029/2004GL021286,.

    Doyle, E.H., S.R. Dallimore, R.A. Fine, A.M. Nur, M.E.Q. Pilson, W.S. Reeburgh, E.D. Sloan Jr., A.M. Tréhu, J. Bintz, J. Merrill, N. Caputo, Charting the future of methane hydrate research in the United States, 2004, National Academies Press, Washington D.C., 192 pp.

    Brocher, T.,M., T. Parsons, A. M. Tréhu, C.M. Snelson, and M.A. Fisher, Seismic evidence for widespread serpentinized forearc upper mantle along the Cascadia margin, Geology, v. 31, p. 267-270, 2003.

    Calvert, A.J., M.A. Fisher, S.Y. Johnson, and SHIPS Working Group, Along-strike variations in the shallow seismic velocity structure of the Seattle fault zone: Evidence for fault segmentation beneath Puget Sound, JGR, DOI 10.1029/2001JB001703, p. ESE1-1 to 14, 2003 (January)

    Tréhu, A.M., D.S. Stakes, C.D. Bartlett, J. Chevallier, R.A. Duncan, S.K. Goffredi, S.M. Potter, K.A. Salamy, Seismic and seafloor evidence for free gas, gas hydrates, and fluid seeps on the transform margin offshore Cape Mendocino, J. Geophys. Res., 108, 2263 (19 pp.), doi:10.1029/2001JB001679, 2003.

    Heeschen, K.U., A.M. Tréhu, R.W. Collier, E. Suess, and G. Rehder, Distribution and height of methane bubble plumes on the Cascadia margin offshore Oregon from acoustic imaging, Geophys. Res. Let., 30, 1643 (4 pp.), doi:10.1029/2003GL016974, 2003.

    Graindorge, D., G. Spence, P. Charvis, J.Y. Collot, R. Hyndman, and A.M. Tréhu, Crustal structure beneath Strait of Juan de Fuca and southern Vancouver Island from seismic and gravity analyses, J. Geophys. Res. 108, 2484 (22 pp.), doi:10.1029/2002JB001823, 2003.

    Calvert, A.J., Fisher, M.A., Ramachandran, K., Tréhu, A.M., Possible emplacement of crustal rocks into the forearc mantle of the Cascadia Subduction Zone, Geophys. Res. Let., v. 30, no. 23, 2196, doi:10.1029/2003GL018541, 2003.

    Preston L.A., K.C. Creager, R.S. Crosson, T.M. Brocher, A.M. Tréhu, Intraslab earthquakes: dehydration of the Cascadia slab, Science, v. 302, sp. 1197-1200, 2003.

    Milkov, A.V., G.E. Claypool, Y.-J. Lee, G.R. Dickens, W. Xu, W.S. Borowski, and Leg 204 Science Party (includes Tréhu, Torres, Johnson from COAS), In situ methane concentrations at Hydrate Ridge offshore Oregon: new constraints on the global gas inventory from an active margin, Geology, v. 30, pg. 833-836, 2003.

    Tréhu, A.M., G. Bohrmann, F.R. Rack, M.E. Torres, Proc. ODP, Init. Repts. 204, [CD-ROM]. Available from: Ocean Drilling Program, Texas A&M Un., College Station TX 77845-9547, USA, 2003.

    Tréhu, A.M., G. Bohrmann, F.R. Rack, M.E. Torres, and Leg 204 Science Party, Gas hydrate distribution and dynamics beneath southern Hydrate Rige: ODP Leg 204, JOIDES Journal, v. 29, Fall, 2003.

    Stakes, D., A.M. Tréhu, S.K. Goffredi, T.H. Naehr, R.A. Duncan, Mass wasting , methane venting, and biological communities on the Mendocino transform fault, Geology, v. 30, p. 407-410, 2002.

    Tréhu, A.M., N.L. Bangs, M.A. Aresnault, G. Bohrmann, C. Goldfinger, J. Johnson, Y. Nakamura, M.E. Torres, Complex subsurface plumbing beneath southern Hydrate Ridge, Oregon continental margin, from high-resolution 3D seismic reflection data, Proceedings of the Fourth International Conference on Gas Hydrate, Yokohama, Japan, May 19-23, 2002.

    Suess, E., G. Bohrmann, D. Rickert, W. Kuhs, M.E. Torres, A.M. Tréhu, P. Linke, Properties and fabric of near-surface methane hydrates at Hydrate Ridge, Cascadia margin, Proceedings of the Fourth International Conference on Gas Hydrate, Yokohama, Japan, May 19-23, 2002.

    Tréhu, A.M., T.M. Brocher, K. Creager, M. Fisher, L. Preston, G. Spence, and the SHIPS98 working group, Geometry of the subducting Juan de Fuca plate: new constraints from SHIPS98, in The Cascadia Subduction Zone and Related Subduction Systems-Seismic Structure, Intraslab Earthquakes and Processes, and Earthquake Hazards: U.S. Geological Survey Open-File Report 02-328, and Geological Survey of Canada Open File 4350; Kirby, Stephen, Wang, Kelin, and Dunlop, Susan, eds., http://geopubs.wr.usgs.gov/openfile/of02-328, p. 25-32, 2002.

    Pratt, T.L., C.S. Weaver, K.C. Creager, R.S. Crosson, R.D. Hyndman, G.D. Spence, A.M. Tréhu, K.C. Miller, U.S. ten Brink, Understanding the seismotectonics of the Cascadia subduction zone: Overview and recent seismic work. in Seismotectonics of subduction zones, eg. Y. Fujinawa, Terra Scientific Publishing Tokyo, pl 25-36, 2002.

    Tréhu, A.M., and E. Flueh, Estimating the thickness of the free gas zone beneath Hydrate Ridge, Oregon continental margin, from seismic velocities and attenuation, Jour. Geophys. Res., v. 106, p. 2035-2045, 2001.

    Suess, E., and 19 others, Seafloor hydrates at Hydrate Ridge, Cascadia margin, in: Natural gas hydates: occurrence, distribution, and detection, C. Paull and W. Dillon, eds, AGU monograph 91, 2001.

    Brocher, T.M., T. Parsons, R.J. Blakely, N.I. Christensen, M.A. Fisher, R.E. Wells, and the SHIPS working group, Upper crustal structure in the Puget Lowland, Washington: results from the 1998 seismic hazards investigation in Puget sound, Jour. Geophys. Res., v. 106, p. 13,541, 2001.

    Calvert, A.J., M.A. Fisher, and SHIPS working group, Imaging the Seattle fault zone with high-resolution seismic tomography, GRL, v. 28, p. 2237-2240, 2001.

    Rohr, K.M.M., M. Scheidhauer, A.M. Tréhu, Transpression between two warm mafic plates: the Queen Charlotte Fault revisited, Jour. Geophys. Res., v. 105, p. 8147-8172, 2000.

    Brocher, T., Parsons, T., Fisher, M.A., Tréhu, A.M. Spence, G.D., and the SHIPS working group, Three-dimensional tomography in the eastern Juan de Fuca Strait: preliminary investigations from SHIPS, in: Mosher, D.C. and Johnson, S.Y. (eds.) Tathwell, G.J., Kung, R.B., and Rhea, S.B. (compilers), Neotectonics of the eastern Juan de Fuca Strait: a digital geological and geophysical atlas. Geol. Survey of Canada Open File Report 3931, 2000.

    Brocher, T., Pratt, T., Creager, K., Crosson, R., Steele, W., Weaver, C., Frankel, A., Tréhu, A., Snelson, C., Miller, K., Harder, S., ten Brink, U., Urban seismic experiments investigate Seattle fault and basin, EOS, Trans. Am. Geophys. Un., v. 81, p. 545, 551-552, 2000.

    Blakely, R.J., R.E. Wells, T.L. Tolan, M.H. Beeson, A.M. Tréhu, L. Liberty, New aeromagnetic data reveal large strike-slip faults in the northern Willamette Valley, Oregon, Geological Society of America Bulletin: Vol. 112, No. 8, pp. 1225–1233, 2000.

    Gerdom*, M. A.M. Tréhu, E. R. Flueh, D. Klaeschen, The continental margin off Oregon from seismic investigations, Tectonophysics, v. 329, p. 79-97, 2000.

    Fisher, M.A., T.M. Brocher, R.D. Hyndman, A. M. Tréhu, C.S. Weaver, K.C. Creager, R.S. Crosson, T. Parsons, A.K. Cooper, D. Mosher, G. Spence, B.C. Zelt, P.T. Hammer, U. ten Brink, T.L. Pratt, K.C. Miller, J. R. Childs, G.R. Cochrane, S. Chopra, and R. Walia, Seismic survey probes urban earthquake hazards in Pacific Northwest, EOS, Trans. Am. Geophys. Un., v. 80, p. 13, 16-17, 1999.

    Fisher, M.A., E.R. Flueh, D.W. Scholl, T. Parsons, R.E. Wells, A. Tréhu, U. ten Brink, C.S. Weaver, Geologic processes of accretion in the Cascadia subductio zone west of Washington state, Geodynamics, v. 27, 277-288, 1999.

    Suess, E., M.E. Torres, G. Bohrmann, R.W. Collier, J. Greinert, P. Linke, G. Rehder, A. Tréhu, K. Wallmann, G. Winckler, E. Zuleger, Gas hydrate destabilization: enhanced dewatering, benthic material turnover, and large methane plumes at the Cascadia convergent margin, Earth and Plan. Sci. Let., v. 170, 1-15, 1999.

    Blakely, R.J., R.E. Wells, A.M. Tréhu, L.M. Liberty, M.H. Beeson, T.L. Tolan, Tectonic setting of the northern Willamette Valley, OR: Evidence from newly acquired aeromagnetic data, Geol. Soc. Am. Bull, in press.

    Liberty, L.M., A.M. Tréhu, R.J. Blakely, M.E. Dougherty, Neogene deformation of the Mt. Angel/ Gales Creek fault zone: Constraints from high-resolution seismic reflection imaging, Bull. Seis. Soc. Am., 89, 1473-1483, 1999.

    Fleming, S., A.M. Tréhu, Crustal 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, Jour. Geophys. Res., 104, 20,431-20,447, 1999.

    Tréhu, A., M. Torres, G. Moore, E. Suess, G. Bohrmann, Dissociation of gas hydrates in response to slumping and folding on the Oregon continental margin, Geology, 27, 939-942, 1999.

    Tryon, M., K. M. Brown, M.E. Torres, A.M. Tréhu, J. McManus, R.W. Collier, Measurements of transience and flow cylcing near episodic methane gas vents, Hydrate Ridge, Cascadia, Geology,v. 27, p. 1075-1078, 1999.

    Leitner, B., A.M. Tréhu, N. Godfrey, Crustal structure of the northwestern Vizcaino Block and Gorda Escarpment offshore northern California: Implications for the influence of plate age on internal deformation, Jour. Geophys. Res., v. 103, p. 23,795-23,812, 1998.

    Godfrey, N., A.S. Meltzer, S.L. Klemperer, A.M. Tréhu, B. Leitner, S. Clarke, A. Ondrus, Evolution of the Mendocino Ridge, San Andreas fault, and Mendocino triple junction from multichannel seismic data collected across the northern Vizcaino Block, CA, Jour. Geophys. Res., v. 103, p. 23,813-23,825, 1998.

    E.R. Flueh, M.A. Fisher, J. Bialas, J.R. Childs, D. Klaeschen, N. Kukowski, T. Parsons, D.W. Scholl, U. ten Brink, A.M. Tréhu, N. Vidal, New seismic images of the Cascadia subduction zone from cruise SO108 - ORWELL, Tectonophysics, v. 293, p. 69-84, 1998.

    Beaudoin, B.C., J.A. Hole, S. Klemperer, and A. M. Tréhu, Location of the southern edge of the Gorda slab and evidence for an adjacent asthenospheric window: Results from seismic profiling and constrained gravity modeling, Jour. Geophys. Res., Dec. 1998.

    Fisher, M.A., T.M. Brocher, R.D. Hyndman, A. M. Tréhu, C.S. Weaver, K.C. Creager, R.S. Crosson, T. Parsons, A.K. Cooper, D. Mosher, G. Spence, B.C. Zelt, P.T. Hammer, U. ten Brink, T.L. Pratt, K.C. Miller, J. R. Childs, G.R. Cochrane, S. Chopra, and R. Walia, Seismic survey probes urban earthquake hazards iin Pacific Northwest, EOS, Trans. Am. Geophys. Un., v. 80, p. 13, 16-17, 1999.

    Parsons, T., A. M. Tréhu, J.H. Luetgert, F. Kilbride, K. Miller, R.E. Wells, M.A. Fisher, N.I. Christensen, U.S. ten Brink, E. Flueh, W.D. Mooney, A new view into the Cascadia subduction zone and volcanic arc: Implications for earthquake hazards along the Washington margin, Geology, February, 1998.

    Levander, A., T.J. Henstock, A.S. Meltzer, B.C. Beaudoin, A.M. Tréhu, S. Klemperer, A window through the lithosphere: Seismic images of active magmatic crustal accretion, Geology, February, 1998.

    Matheney, M.P., R.L. Nowack, A.M. Tréhu, Seismic attribute inversion for velocity and attenution structure using data from e GLIMPCE Lake Superior experiment, Jour. Geophys. Res., v. 102, pp. 9949-9960, 1997.

    Lendl, C., A.M. Tréhu, J. Goff, A. Levander, and B.C. Beaudoin, Synthetic seismograms for synthetic Franciscan: Insights into data acquired during the Mendocino triple junction seismic experiment, Geophys. Res. Let, v. 24, p. 3317-3320, 1997.

    E.R. Flueh, M. Fisher, D.W. Scholl, T. Parsons, U. ten Brink, D. Klaeschen, N. Kukowski, A. Tréhu, J. Childs, J. Bialas, and N. Vidal, Scientific teams analyse earthquake hazards of the Cascadia subduction zone, EOS, Trans. Am. Geophys. Un., v. 78, p. 153, 157, 1997.

    Braunmiller, J., B. Leitner, J. Nabelek, A. Tréhu, Location and source parameters of the June 19, 1994 (Mw = 5.0) offshore Petrolia, CA, earthquake, Bull. Seis. Soc. Am., 87, p. 272-276, 1997.

    Beaudoin, B.C, N.J. Godfrey, S.L. Klemperer, C. Lendl, A.M. Tréhu, T.J. Henstock, A. Levander, J.E. Holl, A.S. Meltzer, J.H. Luetgert, and W.D. Mooney, Transition from slab to slabless: results from the 1993 Mendocino triple junction seismic experiment, Geology, V. 24, P. 195-199, 1996.

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