Microearthquakes at intermediate spreading-rate ridges: The cleft segment megaplume site on the Juan de Fuca Ridge

Bulletin of the Seismological Society of America

Volumn 87, Issue 3, 1997, Pages 684-691

  Hildebrand, John A ^a   McDonald, Mark A ^a   Webb, Spahr C ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

INTERMEDIATE SPREADING RATE; MICROEARTHQUAKE; MICROEARTHQUAKES; MID OCEAN RIDGE; OCEAN BOTTOM SEISMOGRAPH; SEAFLOOR SPREADING; SEISMIC ACTIVITY; SEISMICITY;

PACIFIC, JUAN DE FUCA RIDGE, CLEFT SEGMENT;

EID: 0031441209     PISSN: 00371106     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (44)

1. Archer, S. D., W. S. D. Wilcock, and G. M. Purdy (1995). Microearthquake activity across the Endeavour segment of the Juan de Fuca Ridge near 48° N, EOS Abstract 76, F420.
2. Archer, S. D., W. S. D. Wilcock, and G. M. Purdy (1996). Microearthquake activity associated with hydrothermal circulation on the Endeavour segment of the Juan de Fuca Ridge, EOS Abstract 77, F727.
3. Arnott, S. K. and G. R. Foulger (1994a). The Krafla spreading segment, Iceland 1. Three-dimensional crustal structure and the spatial and temporal distribution of local earthquakes, J. Geophys. Res. 99, 23801-23825.
4. Arnott, S. K. and G. R. Foulger (1994b). The Krafla spreading segment, Iceland 2. The accretionary stress cycle and nonshear earthquake focal mechanisms, J. Geophys. Res. 99, 23827-23842.
5. Baker, E. T. ( 1994). A 6-year time series of hydrothermal plumes over the Cleft segment of the Juan de Fuca Ridge, J. Geophys. Res. 99, 4889-4904.
6. Baker, E. T., J. W. Lavelle, R. A. Feely, G. J. Massoth, S. L. Walker, R. E. Thomson, and J. E. Lupton (1989). Episodic venting of hydrothermal fluids from the Juan de Fuca Ridge, J. Geophys. Res. 94, 9237-9250.
7. Bergman, E. A. and S. C. Solomon (1990). Earthquake swarms on the Mid-Atlantic Ridge: products of magmatism or extensional tectonics?, J. Geophys. Res. 95, 4943-4964.
8. Brune, J. N. (1970). Tectonic stress and the spectra of seismic shear waves from earthquakes, J. Geophys. Res. 75, 4997-5009.
9. Buskirk, R. E., C. Frohlich, G. V. Latham, A. T. Chen, and J. Lawton (1981). Evidence that biological activity affects ocean bottom seismograph recordings, Mar. Geophys. Res. 5, 189-205.
10. Chadwick, W. W., R. W. Embley, and C. G. Fox (1991). Evidence for volcanic eruption on the southern Juan de Fuca Ridge between 1981 and 1987, Nature 350, 416-418.
11. Christeson, G. L., G. M. Purdy, and G. J. Fryer (1994a). Seismic constraints on shallow crustal emplacement processes at the fast spreading East Pacific Rise, J. Geophys. Res. 99, 17957-17973.
12. Christeson, G. L., W. S. D. Wilcock, and G. M. Purdy (1994b). The shallow attenuation structure at the fast-spreading East Pacific Rise near 9°30′ N, Geophys. Res. Lett. 21, 321-324.
13. Dziak, R. P., C. G. Fox, and A. E. Schreiner (1995). The June-July 1993 seismo-acoustic event at CoAxial segment, Juan de Fuca Ridge: evidence for a lateral dike injection, Geophys. Res. Lett. 22, 135-138.
14. Embley, R. W. and W. W. Chadwick, Jr. (1994). Volcanic and hydrothermal processes associated with a recent phase of seafloor spreading at the northern cleft segment: Juan de Fuca Ridge, J. Geophys. Res. 99, 4741-4760.
15. Embley, R. W., W. Chadwick, M. R. Perfit, and E. T. Baker. Geology of the northern Cleft segment, Juan de Fuca: recent lava flows, sea-floor spreading, and the formation of megaplumes, Geology 19, 771-775.
16. Fox, C. G., W. W. Chadwick, and R. W. Embley (1992). Detection of changes in ridge-crest morphology using repeated multibeam sonar surveys, J. Geophys. Res. 97, 11149-11162.
17. Fox, C. G., R. P. Dziak, H. Matsumoto, and A. E. Schreiner (1994). Potential for monitoring low-level seismicity on the Juan de Fuca Ridge using military hydrophone arrays, Marine Technol Soc. J. 27, 22-30.
18. Fox, C. G., W. E. Radford, R. P. Dziak, T. Lau, H. Matsumoto, and A. E. Schreiner (1995). Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays, Geophys. Res. Lett. 22, 131-134.
19. Gudmundsson, A. (1990). Emplacement of dikes, sills and crustal magma chambers at divergent plate boundaries, Tectonophysics 176, 257-275.
20. Kappel, E. S. and W. R. Normark (1987). Morphometric variability within the Axial Zone of the southern Juan de Fuca Ridge: interpretation from SeaMARC II, SeaMARC I, and deep-sea photography, J. Geophys. Res. 92, 11291-11302.
21. Kappel, E. S. and W. B. F. Ryan (1986). Volcanic episodicity and a non-steady state rift valley along northeast Pacific spreading centers: evidence from SeaMARC I, J, Geophys. Res. 91, 925-940.
22. Klein, F. W., R. Y. Koyanagi, J. S. Nakata, and W. R. Tanigawa (1987). The Seismicity of Kilauea's Magma System, Geol. Surv. Profess. Pap. 1350, vol. 2, R. W. Decker, T. L. Wright, and P. H. Stauffer (Editors), U.S. Government Printing Office, Washington, D.C., 1019-1186.
23. Lahr, J. C. (1989). Hypoellipse/version 2.0*: a computer program for determining local earthquake hypocentral parameters, magnitude and first motion pattern, Geol. Surv. Open-File Rep. 89-116, U.S. Government Printing Office, Washington, D.C., 81.
24. Mallick, S. and L. N. Frazer (1990). Po/So synthetics for a variety of oceanic models and their implications for the structure of the oceanic lithosphere, Geophys. J. Int. 100, 235-253.
25. McClain, J. S., M. L. Begnaud, M. A. Wright, and J. Fondrk (1993). Seismicity and tremor in a submarine hydrothermal field - the northern Juan de Fuca Ridge, Geophys. Res. Lett. 20, 1883-1886.
26. Donald, M. A., S. C. Webb, J. A. Hildebrand, B. D. Cornuelle, and C. G. Fox (1994). Seismic structure and anisotropy of the Juan de Fuca Ridge at 45° N, J. Geophys. Res. 99, 4857-4875.
27. McDonald, M. A., J. A. Hildebrand, and S. C. Webb (1995). Blue and fin whales observed on a seafloor array in the Northeast Pacific, J. Acoustic Soc. Am. 98, 712-721.
28. McGarr, A. (1991). Observations constraining near-source ground motion estimated from locally recorded seismograms, J. Geophys. Res. 96, 16495-16508.
29. Morton, J. L., N. H. Sleep, W. R. Normark, and D. H. Tompkins (1987). Structure of the southern Juan de Fuca Ridge from seismic reflection records, J. Geophys. Res. 92, 11315-11326.
30. Murphy, K. M. and R. W. Embley (1988). A morphologic and structural study of the Vance Seamount Chain: relationship to volcanism on the Juan de Fuca Ridge, EOS 69, 1503.
31. Okada, Y. and E. Yamamoto (1991). Dyke intrusion model for the 1989 seismovolcanic activity off Ito, Central Japan, J. Geophys. Res. 96, 10361-10376.
32. Riedesel, M., J. A. Orcutt, K. C. Macdonald, and J. S. McClain (1982). Microearthquakes in the black smoker hydrothermal field, East Pacific Rise at 21° N, J. Geophys. Res. 87, 10613-10623.
33. Rubin, A. M. (1992). Dike-induced faulting and graben subsidence in volcanic rift zones, J. Geophys. Res. 97, 1839-1858.
34. Scholz, C. H. (1990). The Mechanics of Earthquakes and Faulting, Cambridge U Press, New York, 439 pp.
35. Schwartz, D. P. and K. J. Coppersmith (1984). Fault behavior and characteristic earthquakes: examples from the Watsatch and San Andreas Fault Zones, J. Geophys. Res. 89, 5681-5698.
36. Sohn, R. A., J. A. Hildebrand, S. C. Webb, and C. G. Fox (1995). Hydrothermal seismicity at the Megaplume site on the Southern Juan de Fuca Ridge, Bull. Seism. Soc. Am. 85, 775-786.
37. Sohn, R. A., S. C. Webb, and J. A. Hildebrand (1996). Post-eruption microseismiciry on the CoAxial segment, Juan de Fuca Ridge, EOS Abstract 77, F723.
38. Solomon, S. C., P. Y. Huang, and L. Meinke (1988). The seismic moment budget of slowly spreading ridges. Nature 334, 58-60.
39. Stevenson, J. M., J. A. Hildebrand, M. A. Zumberge, and C. G. Fox (1994). An ocean bottom gravity study of the southern Juan de Fuca Ridge, J. Geophys. Res. 99, 4875-4888.
40. Thatcher, W. and T. C. Hanks (1973). Source parameters of Southern California earthquakes, J. Geophys. Res. 78, 8547-8576.
41. Wesnousky, S. G. (1994). The Gutenberg-Richter or characteristic earthquake distribution, which is it?, Bull. Seism. Soc. Am. 84, 1940-1959.
42. Wilcock, W. S. D., G. M. Purdy, S. C. Solomon, D. L. DuBois, and D. R. Toomey (1992). Microearthquakes on and near the East Pacific Rise, 9°10′ N, Geophys. Res. Lett. 19, 2131-2134.
43. Wilson, D. S. (1993). Confidence intervals for motion and deformation of the Juan de Fuca plate. J. Geophys. Res. 98, 16053-16071.
44. Wolfe, C. J., G. M. Purdy, D. R. Toomey, and S. C. Solomon (1995). Microearthquake characteristics and crustal velocity structure at 29° N on the Mid-Atlantic Ridge - the architecture of a slow spreading segment, J. Geophys. Res. 100, 24449-24472.