Seismotectonics of the Explorer region

Journal of Geophysical Research: Solid Earth

Volumn 107, Issue 10, 2002, Pages

  Braunmiller, Jochen ^a   Nábělek, John ^b  

^a ETH ZURICH   (Switzerland)

^b OREGON STATE UNIVERSITY   (United States)

Author keywords

Earthquake source parameters; Explorer plate; Microplates; Regional moment tensors; Seismicity; Seismotectonics

Indexed keywords

CONVERGENT MARGIN; EARTHQUAKE; PLATE BOUNDARY; PLATE TECTONICS; SEISMOTECTONICS; SOURCE PARAMETERS; SUBDUCTION; TECTONIC SETTING;

EXPLORER REGION; PACIFIC OCEAN;

EID: 0037058175     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: None     Document Type: Article

References (80)

1. Aki, K., and P. G. Richards, Quantitative Seismology: Theory and Methods, vol. 1, W. H. Freeman, New York, 1980.
2. Allan, J. F., R. L. Chase, B. Cousens, P. J. Michael, M. P. Gorton, and S. D. Scott, The Tuzo Wilson volcanic field, NE Pacific: Alkaline volcanism at a complex, diffuse, transform-trench-ridge triple junction, J. Geophys. Res., 98, 22,367-22,387, 1993.
3. Atwater, T., Plate tectonic history of the northeast Pacific and western North America, in The Geology of North America, vol. N, The Eastern Pacific Ocean and Hawaii, edited by E. L. Winterer, D. M. Hussong, and R. E. Decker, pp. 21-72, Geol. Soc. of Am., Boulder, Colo., 1989.
4. Barr, S. M., and R. L. Chase, Geology of the northern end of the Juan de Fuca Ridge and sea-floor spreading, Can. J. Earth Sci., 11, 1384-1406, 1974.
5. Bérubé, J., G. C. Rogers, R. M. Ellis, and E. O. Hasselgren, A microseismicity study of the Queen Charlotte Islands region, Can. J. Earth Sci., 26, 2556-2566, 1989.
6. Bird, A. L., and G. C. Rogers, Earthquakes in the Queen Charlotte Islands region (abstract), Eos Trans. AGU, 77(46), Fall Meet. Suppl., F522, 1996.
7. Bohannon, R. G., and T. Parsons, Tectonic implications of post-30 Ma Pacific and North America relative plate motions, Geol. Soc. Am. Bull., 107, 937-959, 1995.
8. Botros, M., and H. P. Johnson, Tectonic evolution of the Explorer-northern Juan de Fuca region from 8 Ma to the present, J. Geophys. Res., 93, 10,421-10,437, 1988.
9. Bouchon, M., The complete synthesis of seismic crustal phases at regional distances, J. Geophys. Res., 87, 1735-1741, 1982.
10. Braunmiller, J., J. L. Nábélek, B. Leitner, and A. Qamar, The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data, Geophys. Res. Lett., 22, 105-108, 1995.
11. Carbotte, S. M., J. M. Dixon, E. Farrar, E. E. Davis, and R. P. Riddihough, Geological and geophysical characteristics of the Tuzo Wilson sea-mounts: Implications for the plate geometry in the vicinity of the Pacific-North America-Explorer triple junction, Can. J. Earth Sci., 26, 2365-2384, 1989.
12. s 6.8 earthquake, offshore British Columbia, Bull. Seismol. Soc. Am., 85, 716-735, 1995.
13. Cassidy, J. F., R. M. Ellis, and G. C. Rogers, The 1918 and 1957 Vancouver Island earthquakes, Bull. Seismol. Soc. Am., 78, 617-635, 1988.
14. Cassidy, J. F., R. M. Ellis, C. Karavas, and G. C. Rogers, The northern limit of the subducted Juan de Fuca plate system, J. Geophys. Res., 103, 26,949-26,962, 1998.
15. Chase, R. L., D. L. Tiffin, and J. W. Murray, The western Canadian continental margin, in Canada's Continental Margins and Offshore Petroleum Exploration, edited by C. J. Yorath, E. R. Parker, and D. J. Glass, Mem. Can. Soc. Pet. Geol., 4, 701-721, 1975.
16. Clowes, R. M., D. J. Baird, and S. A. Dehler, Crustal structure of the Cascadia subduction zone, southwestern British Columbia, from potential field and seismic studies, Can. J. Earth Sci., 34, 317-336, 1997.
17. Cousens, B. L., R. L. Chase, and J. G. Schilling, Basalt geochemistry of the Explorer Ridge area, northeast Pacific Ocean, Can. J. Earth Sci., 21, 157-170, 1984.
18. Cousens, B. L., R. L. Chase, and J. G. Schilling, Geochemistry and origin of volcanic rocks from Tuzo Wilson and Bowie seamounts, northeast Pacific Ocean, Can. J. Earth Sci., 22, 1609-1617, 1985.
19. Cowan, D. S., M. Botros, and H. P. Johnson, Bookshelf tectonics: rotated crustal blocks within the Sovanco fracture zone, Geophys. Res. Lett., 13, 995-998, 1986.
20. Davis, E. E., and R. G. Currie, Geophysical observations of the northern Juan de Fuca ridge system: lessons in seafloor spreading, Can. J. Earth Sci., 30, 278-300, 1993.
21. Davis, E. E., and R. D. Hyndman, The structure and tectonic history of the northern Cascadia subduction zone: Recent accretion and deformation, Geol. Soc. Am. Bull., 101, 1465-1480, 1989.
22. Davis, E. E., and C. R. B. Lister, Tectonic structures on the Juan de Fuca ridge, Geol. Soc. Am. Bull., 88, 346-363, 1977.
23. Davis, E. E., and R. P. Riddihough, The Winona Basin: Structure and tectonics, Can. J. Earth Sci., 19, 767-788, 1982.
24. Dehler, S. A., and R. M. Clowes, The Queen Charlotte Islands refraction project, part I, The Queen Charlotte fault zone, Can. J. Earth Sci., 25, 1857-1870, 1988.
25. DeMets, C., R. G. Gordon, D. F. Argus, and S. Stein, Current plate motions, Geophys. J. Int., 101, 425-478, 1990.
26. DeMets, C., R. G. Gordon, D. F. Argus, and S. Stein, Effect of recent revision to the geomagnetic reversal time scale on estimates of current plate motions, Geophys. Res. Lett., 21, 2191-2194, 1994.
27. Dewey, J. W., Seismicity and tectonics of western Venezuela, Bull. Seismol. Soc. Am., 62, 1711-1752, 1972.
28. Douglas, A., Joint epicentre determination, Nature, 215, 47-48, 1967.
29. Dragert, H., and R. D. Hyndman, Continuous GPS monitoring of elastic strain in the northern Cascadia subduction zone, Geophys. Res. Lett., 22, 755-758, 1995.
30. Dziak, R. P., and C. G. Fox, Juan de Fuca ridge T-wave earthquakes August 1991 to present: Volcanic and tectonic implications (abstract), Eos Trans. AGU, 76(46), Fall Meet. Suppl., F410, 1995.
31. Dziak, R. P., and C. G. Fox, The January 1998 earthquake swarm at Axial Volcano, Juan de Fuca Ridge: Hydroacoustic evidence of a seafloor volcanic activity, Geophys Res. Lett., 26, 3429-3432, 1999.
32. Dziak, R. P., C. G. Fox, and A. E. Schreiner, The June-July 1993 seismoacoustic event at CoAxial segment, Juan de Fuca ridge: Evidence for a lateral dike injection, Geophys. Res. Lett., 22, 135-138, 1995.
33. Dziewonski, A. M., G. Ekström, and M. P. Salganik, Centroid-moment tensor solutions for October-December, 1993, Phys. Earth Planet. Inter., 85, 215-225, 1994.
34. Engebretson, D. C. A. Cox, and R. G. Gordon, Relative motions between oceanic and continental plates in the Pacific Basin, Spec. Pap. Geol. Soc. Am., 206, 59 pp., 1985.
35. Forsyth, D., and S. Uyeda, On the relative importance of the driving forces of plate motion, Geophys. J. R. Astron. Soc., 43, 163-200, 1975.
36. Gripp, A. E., and R. G. Gordon, Current plate velocities relative to the hotspots incorporating the NUVEL-1 global plate motion model, Geophys. Res. Lett., 17, 1109-1112, 1990.
37. Gutenberg, B., and C. F. Richter, Seismicity of the Earth and Associated Phenomena, 2nd ed., Princeton Univ. Press, Princeton, N. J., 1954.
38. Hanks, T. C., and H. Kanamori, A moment magnitude scale, J. Geophys. Res., 84, 2348-2350, 1979.
39. Horn, J. R., R. M. Clowes, R. M. Ellis, and D. N. Bird, The seismic structure across an active oceanic/continental transform fault zone, J. Geophys. Res., 89, 3107-3120, 1984.
40. Huang, P. Y., S. C. Solomon, E. A. Bergman, and J. L. Nábělek, Focal depths and mechanisms of Mid-Atlantic Ridge earthquakes from body wave inversion, J. Geophys. Res., 91, 579-598, 1986.
41. Hyndman, R. D., and R. M. Ellis, Queen Charlotte fault zone: Microearthquakes from a temporary array of land stations and ocean bottom seismographs. Can. J. Earth Sci., 18, 776-788, 1981.
42. Hyndman, R. D., and G. C. Rogers, Seismicity surveys with ocean bottom seismographs off western Canada, J. Geophys. Res., 86, 3867-3880, 1981.
43. Hyndman, R. D., and D. H. Weichert, Seismicity and rates of relative motion on the plate boundaries of western North America, Geophys. J. R. Astron. Soc., 73, 59-82, 1983.
44. Hyndman, R. D., R. P. Riddihough, and R. Herzer, The Nootka fault zone-A new plate boundary off western Canada, Geophys. J. R. Astron. Soc., 58, 667-683, 1979.
45. Hyndman, R. D., T. J. Lewis, J. A. Wright, M. Burgess, D. S. Chapman, and M. Yamano, Queen Charlotte fault zone: Heat flow measurements, Can. J. Earth Sci., 19, 1657-1669, 1982.
46. Johnson, H. P., M. A. Hutnak, R. P. Dziak, C. G. Fox, I. Urcuyo, C. Fisher, J. P. Cowen, and J. Nábělek, Earthquake-induced changes in a hydrothermal system at the Endeavour Segment, Juan de Fuca Ridge, Nature, 407, 174-177, 2000.
47. Karsten, J. L., S. R. Hammond, E. E. Davis, and R. G. Currie, Detailed geomorphology and neotectonics of the Endeavour segment, Juan de Fuca ridge: New results from SeaBeam swath mapping, Geol. Soc. Am. Bull., 97, 213-221, 1986.
48. Kreemer, C., R. Govers, K. P. Furlong, and W. E. Holt, Plate boundary deformation between the Pacific and North America in the Explorer region, Tectonophysics, 293, 225-238, 1998.
49. Kulm, L. D., R. von Huene, J. R. Duncan, J. C. Ingle, S. A. Kling, L. F. Musich, D. J. W. Piper, R. M. Pratt, H.-J. Schrader, O. Weser, and S. W. Wise Jr., Site 177, Initial Rep. Deep Sea Drill. Proj., 18, 233-285, 1973.
50. Lewis, T. J., C. Lowe, and T. S. Hamilton, The continental signature of a ridge-trench-transform triple junction: northern Vancouver Island, J. Geophys. Res., 102, 7767-7781, 1997.
51. Lister, C. R. B., Plate tectonics at an awkward junction: Rules for the evolution of Sovanco Ridge area, NE Pacific, Geophys. J., 96, 191-201, 1989.
52. Lonsdale, P., Structural patterns of the Pacific floor offshore of Peninsular California, in Gulf and Peninsular Province of the Californias, edited by J. P. Dauphin and B. R. T. Simoneit, AAPG Mem., 47, 87-143, 1991.
53. Mackie, D. J., R. M. Clowes, S. A. Dehler, R. M. Ellis, and L. P. Morel-A-L'Huissier, The Queen Charlotte Islands refraction project, part II, Structural model for transition from Pacific to North America plate, Can. J. Earth Sci., 26, 1713-1725, 1989.
54. Michael, P. J., R. L. Chase, and J. F. Allan, Petrologic and geologic variations along southern Explorer Ridge, northeast Pacific Ocean, J. Geophys. Res., 94, 13,895-13,918, 1989.
55. Nábělek, J., and G. Xia, Moment-tensor analysis using regional data: application to the 25 March, 1993, Scotts Mills, Oregon earthquake, Geophys. Res. Lett., 22, 13-16, 1995.
56. Nicholson, C., C. C. Sorlien, T. Atwater, J. C. Crowell, and B. P. Luyendyk, Microplate capture, rotation of the western Transverse Ranges, and initiation of the San Andreas transform as a low-angle fault system, Geology, 22, 491-495, 1994.
57. Riddihough, R. P., A model for recent plate interactions off Canada's west coast, Can. J. Earth Sci., 14, 384-396, 1977.
58. Riddihough, R. P., Gorda plate motions from magnetic anomaly analysis, Earth Planet. Sci. Lett., 51, 163-170, 1980.
59. Riddihough, R. P., Contemporary movements and tectonics on Canada's west coast: A discussion, Tectonophysics, 86, 319-341, 1982.
60. Riddihough, R. P., Recent movements of the Juan de Fuca plate system, J. Geophys. Res., 89, 6980-6994, 1984.
61. Riddihough, R. P., R. G. Currie, and R. D. Hyndman, The Dellwood Knolls and their role in triple junction tectonics off northern Vancouver Island, Can. J. Earth Sci., 17, 577-593, 1980.
62. Rohr, K. M. M., and J. R. Dietrich, Strike slip tectonics and development of the Tertiary Queen Charlotte Basin, offshore western Canada: Evidence from seismic reflection data, Basin Res., 4, 1-19, 1992.
63. Rohr, K. M. M., and K. P. Furlong, Ephemeral plate tectonics at the Queen Charlotte triple junction, Geology, 23, 1035-1038, 1995.
64. Rohr, K. M. M., M. Scheidhauer, and A. M. Trehu, Transpression between two warm mafic plates: The Queen Charlotte Fault revisited, J. Geophys. Res., 105, 8147-8172, 2000.
65. Scheidhauer, M., Crustal structure of the Queen Charlotte transform fault zone from multichannel seismic reflection and gravity data, M.Sc. thesis, 184 pp., Oreg. State Univ., Corvallis, 1997.
66. Spindler, C., G. C. Rogers, and J. F. Cassidy, The 1978 Brooks peninsula, Vancouver Island, earthquakes, Bull. Seismol. Soc. Am., 87, 1011-1023, 1997.
67. Srivastava, S. P., D. L. Barrett, C. E. Keen, K. S. Manchester, K. G. Shih, D. L. Tiffin, R. L. Chase, A. G. Thomlinson, E. E. Davis, and C. R. B. Lister, Preliminary analysis of geophysical measurements north of Juan de Fuca ridge, Can. J. Earth Sci., 8, 1265-1281, 1971.
68. Stock, J. M., and J. Lee, Do microplates in subduction zones leave a geologic record?, Tectonics, 13, 1472-1487, 1994.
69. Stock, J. M., and P. Molnar, Uncertainties and implications of the Cretaceous and Tertiary position of North America relative to Farallon, Kula, and Pacific plates, Tectonics, 6, 1339-1384, 1988.
70. Sweeney, J. F., and D. A. Seemann, Crustal density structure of Queen Charlotte Islands and Hecate Strait, British Columbia, in Evolution and Hydrocarbon Potential of the Queen Charlotte Basin, British Columbia, edited by G. Woodsworth, Pap. Geol. Surv. Can., 90-10, 89-96, 1991.
71. Tiffin, D. L., B. E. B. Cameron, and J. W. Murray, Tectonics and depositional history of the continental margin off Vancouver Island, British Columbia, Can. J. Earth Sci., 9, 280-296, 1972.
72. Turcotte, D. L., and G. Schubert, Geodynamics: Applications of Continuum Physics to Geological Problems, John Wiley, New York, 1982.
73. Wahlström, R., and G. C. Rogers, Relocation of earthquakes west of Vancouver Island, British Columbia, 1965-1983, Can. J. Earth Sci., 29, 953-961, 1992.
74. Wahlström, R., G. C. Rogers, and R. E. Baldwin, P-nodal focal mechanisms for large earthquakes offshore Vancouver Island, Geol. Surv. Can. Open File Rep., 2268, 1990.
75. Wessel, P., and W. H. F. Smith, New version of the generic mapping tools released, Eos Trans. AGU, 76, 329, 1995.
76. Wilson, D. S., A kinematic model for the Gorda deformation zone as a diffuse southern boundary of the Juan de Fuca plate, J. Geophys. Res., 91, 10,259-10,269, 1986.
77. Wilson, D. S., Deformation of the so-called Gorda plate, J. Geophys. Res., 94, 3065-3075, 1989.
78. Wilson, D. S., Confidence intervals for motion and deformation of the Juan de Fuca plate, J. Geophys. Res., 98, 16,053-16,071, 1993.
79. Yorath, C. J., and R. D. Hyndman, Subsidence and thermal history of Queen Charlotte Basin, Can. J. Earth Sci., 20, 135-159, 1983.
80. Yuan, T., G. D. Spence, and R. D. Hyndman, Structure beneath Queen Charlotte Sound from seismic-refraction and gravity interpretation, Can. J. Earth Sci., 29, 1509-1529, 1992.