Session: The Cascade Volcanic Arc System (Posters) (2003 Seattle Annual Meeting (November 2

Paper #

Booth #

1

189

HIGH-SR MAGNESIAN ANDESITES OF THE RAFFUSE CREEK-MAMQUAM RIVER AREA, SW BRITISH COLUMBIA: EVIDENCE FOR MULTISTAGE EVOLUTION OF HYDROUS MANTLE MELTS

POWELL Jr, James H., Geological Sciences, Univ of Alabama, 202 Bevill Building, Tuscaloosa, AL 35487-0338 and GREEN, Nathan L., Department of Geological Sciences, The Univ of Alabama, 202 Bevill Building, Tuscaloosa, AL 35487-0338, powel003@bama.ua.edu, powel003@bama.ua.edu

2

190

RELATION OF CONVERGENT MARGIN VOLCANISM TO SLAB AGE AND THERMAL STRUCTURE: POSSIBLE INFLUENCES ON ANDESITIC MAGMATISM OF THE NORTHERN CASCADIA SUBDUCTION SYSTEM

GREEN, Nathan L., Department of Geological Sciences, The Univ of Alabama, 202 Bevill Building, Tuscaloosa, AL 35487-0338, ngreen@wgs.geo.ua.edu, ngreen@wgs.geo.ua.edu

3

191

NEW RESULTS FROM A PROPOSED PBO CASCADE VOLCANO CLUSTER III: POST-ERUPTIVE DEFORMATION OF MOUNT ST. HELENS, WASHINGTON, FROM EDM AND GPS

LISOWSKI, Michael, DZURISIN, Daniel, ENDO, Elliot, IWATSUBO, Eugene and POLAND, Michael, Cascades Volcano Observatory, US Geol Survey, 1300 SE Cardinal Ct., Suite 100, Vancouver, WA 98683-9589, mlisowski@usgs.gov, mlisowski@usgs.gov

4

192

REMOTE SENSING AS A TOOL FOR GEOLOGIC MAPPING AT MOUNT ST. HELENS, WASHINGTON

ROBINSON, Joel E.¹, ROBINSON, Joel E.¹, RAMSEY, David W.¹, CLYNNE, Michael A.¹, SCHILLING, Steve P.² and THOMPSON, Ren A.³, (1)Volcano Hazards Team, U. S. Geol Survey, 345 Middlefield Road, MS 910, Menlo Park, CA 94025, (2)Cascade Volcano Observatory, U. S. Geol Survey, 1300 SE Cardinal Court, Building 10 Suite 100, Vancouver, WA 98683, (3)U. S. Geol Survey, Box 25046 MS 913, Denver Federal Center, Denver, CO 80225, jrobins@usgs.gov, jrobins@usgs.gov

5

193

INSAR ANALYSIS OF SURFACE DEFORMATION AT MOUNT ST. HELENS, WASHINGTON

DIEFENBACH, Angela K., Geological Sciences, Central Washington Univ, 400 East 8th Avenue, Ellensburg, WA 98926 and POLAND, Michael P., Cascades Volcano Observatory, US Geol Survey, 1300 Cardinal Ct. Suite 100, Vancouver, WA 98683-9589, angiedbach@hotmail.com, angiedbach@hotmail.com

6

194

GEOPHYSICAL INVESTIGATIONS OF THE CASCADE SUBDUCTION ZONE, NORTH AMERICA

ROMANYUK, Tanya¹, MOONEY, Walter D.² and BLAKELY, Richard², (1)Institute of Physics of the Earth, B Gruzinskaya 10, Moscow, 123810, Russia, (2)USGS, 345 Middlefield Rd, MS 977, Menlo Park, CA 94025, mooney@usgs.gov, mooney@usgs.gov

7

195

ERUPTIVE STYLE AND HISTORY OF MOUNT HOOD VOLCANO, OREGON

SCOTT, W.E.¹, GARDNER, C.A.², TILLING, R.I.³ and LANPHERE, M.A.³, (1)U.S. Geological Survey, 1300 SE Cardinal Court, Vancouver, WA 98683, (2)U.S. Geol Survey, 1300 SE Cardinal Court, Vancouver, WA 98683, (3)U.S. Geol Survey, 345 Middlefield Rd, Menlo Park, CA 94025, wescott@usgs.gov, wescott@usgs.gov

8

196

TWO YOUNG SILICIC SISTERS AT THREE SISTERS VOLCANIC FIELD, OREGON

FIERSTEIN, Judy¹, CALVERT, Andrew² and HILDRETH, Wes¹, (1)U.S. Geol Survey, 345 Middlefield Road, MS-910, Menlo Park, CA 94025, (2)U.S. Geol Survey, 345 Middlefield Road, MS-937, Menlo Park, CA 94025, jfierstn@usgs.gov, jfierstn@usgs.gov

9

197

THE PERSISTENCE OF NORTH SISTER BASALTIC ANDESITE AND IMPLICATIONS FOR DEEP CRUSTAL PROCESSES IN THE CENTRAL OREGON HIGH CASCADES

SCHMIDT, Mariek E., Department of Geosciences, Oregon State Univ, Corvallis, OR 97331 and GRUNDER, Anita L., Geosciences, Oregon State Univ, schmidtm@geo.orst.edu, schmidtm@geo.orst.edu

10

198

NEW RESULTS FROM A PROPOSED PBO CASCADE VOLCANO CLUSTER II: INSAR, GPS, AND TILT-LEVELING DATA FROM THE THREE SISTERS AREA, CENTRAL OREGON

DZURISIN, Daniel¹, ENDO, Elliot¹, IWATSUBO, Eugene¹, LISOWSKI, Michael¹, POLAND, Michael¹ and WICKS Jr, Charles², (1)Cascades Volcano Observatory, US Geol Survey, 1300 SE Cardinal Ct., Suite 100, Vancouver, WA 98683-9589, (2)U.S. Geol Survey, 345 Middlefield Road, Mail Stop 977, Menlo Park, CA 94025, dzurisin@usgs.gov, dzurisin@usgs.gov

11

199

MEDICINE LAKE VOLCANO: RESULTS OF GEOLOGIC MAPPING AND ARGON DATING

DONNELLY-NOLAN, Julie M., U.S. Geological Survey, 345 Middlefield Road, MS 910, Menlo Park, CA 94025, LANPHERE, Marvin A., U.S. Geol Survey, 345 Middlefield Rd, Menlo Park, CA 94025 and RAMSEY, David W., U.S. Geol Survey, 345 Middlefield Rd, MS 910, Menlo Park, CA 94025, jdnolan@usgs.gov, jdnolan@usgs.gov

12

200

NEW RESULTS FROM A PROPOSED PBO CASCADE VOLCANO CLUSTER I: DEFORMATION IN THE MEDICINE LAKE REGION OF NORTHEAST CALIFORNIA FROM LEVELING, GPS, AND INSAR

POLAND, Michael¹, DZURISIN, Daniel¹, HAMMOND, William², ENDO, Elliot¹, IWATSUBO, Eugene¹ and LISOWSKI, Michael¹, (1)Cascades Volcano Observatory, US Geol Survey, 1300 SE Cardinal Ct., Suite 100, Vancouver, WA 98683-9589, (2)US Geol Survey, 345 Middlefield Road, MS 977, Menlo Park, CA 94025, mpoland@usgs.gov, mpoland@usgs.gov

13

201

OXYGEN ISOTOPE CONSTRAINTS ON MAGMATIC EVOLUTION AND SOURCES AT LASSEN VOLCANIC CENTER, CALIFORNIA

FEELEY, Todd C., Dept. Earth Sciences, Montana State Univ, Bozeman, MT 59717, CLYNNE, Michael A., U.S. Geol Survey, 345 Middlefield Road, Mail Stop 910, Menlo Park, CA 94025 and LARSON, Toti, Earth & Planetary Sciences, Univ of New Mexico, Northrop Hall, Albuequerque, NM 87106, tfeeley@montana.edu, tfeeley@montana.edu

14

202

THE MULTIPLE PERSONALITIES OF ZONED CRYSTALS: COMPLEX GROWTH HISTORIES, THE MIXING PHYLOGENY, AND GEOCHRONOLOGY, WITH APPLICATIONS TO THE LASSEN VOLCANIC SYSTEM

WALLACE, Glen and BERGANTZ, George W., Earth Space Sciences, Univ of Washington, Box 351310, Seattle, WA 98195, gsw@u.washington.edu, gsw@u.washington.edu

15

203

CONSTRAINTS ON THE TIMESCALES AND MIXING DYNAMICS OF THE MAGMA RECHARGE EVENT ASSOCIATED WITH THE 1915 ERUPTION OF LASSEN PEAK, CALIFORNIA

SALISBURY, Morgan J., Geological Sciences, Central Washington Univ, 400 E 8th Ave, Ellensburg, WA 98926, BOHRSON, Wendy A., Dept. Geol. Sci, Central Washington Univ, Ellensburg, WA 98926 and CLYNNE, Michael A., Volcano Hazards Team, U.S. Geol Survey, 345 Middlefield Rd MS910, Menlo Park, CA 94025, salisbum@cwu.edu, salisbum@cwu.edu

2003 Seattle Annual Meeting (November 2–5, 2003)

T148. The Cascade Volcanic Arc System (Posters)