Evidence for a metastable olivine wedge inside the subducted Mariana slab

Earth and Planetary Science Letters

Volumn 258, Issue 1-2, 2007, Pages 219-227

  Kaneshima, Satoshi ^a   Okamoto, Taro ^b   Takenaka, Hiroshi ^a  

^a KYUSHU UNIVERSITY   (Japan)

^b TOKYO INSTITUTE OF TECHNOLOGY   (Japan)

Author keywords

deep earthquakes; low velocity wedge; metastable olivine; seismic array; shear instability; subducted slab; waveform analyses

Indexed keywords

METASTABLE OLIVINE; SEISMIC ARRAY; SHEAR INSTABILITY; SUBDUCTED SLAB;

ACOUSTIC WAVE VELOCITY; EARTHQUAKES; OLIVINE; SEISMIC WAVES; WAVEFORM ANALYSIS;

TECTONICS;

CODA; EARTHQUAKE EVENT; EARTHQUAKE MECHANISM; OLIVINE; P-WAVE; PACIFIC PLATE; SEISMICITY; SUBDUCTION; TECTONIC WEDGE; VELOCITY STRUCTURE; WAVEFORM ANALYSIS;

FLORIDA [UNITED STATES]; MARIANNA; NORTH AMERICA; UNITED STATES;

EID: 34249009333     PISSN: 0012821X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.epsl.2007.03.035     Document Type: Article

References (39)

1. Sung C.M., and Burns R.G. Kinetics of olivine-spinel transition: implications to deep-focus earthquake genesis. Earth Planet. Sci. Lett. 32 (1976) 165-170
2. Bina C.R., Stein S., Marton F.C., and Ark E.M.V. Implications of slab mineralogy for subduction dynamics. Phys. Earth Planet. Inter. 127 (2001) 51-66
3. Kirby S.H., Stein S., Okal E.A., and Rubie D.C. Metastable mantle phase transformations and deep earthquakes in subducting oceanic lithosphere, transformation of olivine. Rev. Geophys. 34 (1996) 261-306
4. Wiens D.A., McGuire J.J., and Shore P.J. Evidence for transformational faulting from a deep double seismic zone in Tonga. Nature 364 (1993) 790-793
5. Iidaka T., and Suetsugu D. Seismological evidence for metastable olivine inside a subducting slab. Nature 356 (1992) 593-595
6. Koper K.D., Wiens D.A., Dorman L.M., Hildebrand J.A., and Webb S.C. Modeling the Tonga slab: Can travel time data resolve a metastable olivine wedge?. J. Geophys. Res. 103 (1998) 30079-30100
7. Vidale J.E., Williams Q., and Houston H. Waveform effects of a metastable olivine tongue in subducting slabs. Geophys. Res. Lett. 18 (1991) 2201-2204
8. Koper K.D., and Wiens D.A. The waveguide effect of metastable olivine in slabs. Geophys. Res. Lett. 27 (2000) 573-576
9. Brudzinski M.R., and Chen W.-P. Variations in P wave speeds and outboard earthquakes: evidence for a petrologic anomaly in the mantle transition zone. J. Geophys. Res. 105 (2000) 21661-21682
10. Brudzinski M.R., and Chen W.-P. A petrologic anomaly accompanying outboard earthquakes beneath Fiji-Tonga: corresponding evidence from broadband P and S waveforms. J. Geophys. Res. 108 B6 (2003) 2299 10.1029/2002JB002012
11. Chen W.-P., and Brudzinski M.R. Seismic anisotropy in the mantle transition zone beneath Fiji-Tonga. Geophys. Res. Lett. 30 13 (2003) 1862 10.1029/2002GL016330
12. Green II H.W., and Burnley P.C. A new selforganizing, mechanism for deep-focus earthquakes. Nature 341 (1989) 733-737
13. Green II H.W., and Houston H. The mechanisms deep earthquakes. Annu. Rev. Earth Planet. Sci. 23 (1995) 169-213
14. Meade C., and Jeanloz R. Deep-focus earthquakes and recycling of water into the Earth's mantle. Science 252 (1991) 68-72
15. Ogawa M. Shear instabilities in a viscoelastic material as the cause of deep focus earthquakes. J. Geophys. Res. 92 (1987) 13801-13810
16. Hobbs B.E., and Ord A. Plastic instabilities: implication for the origin of intermediate and deep focus earthquakes. J. Geophys. Res. 93 (1988) 10521-10540
17. Karato S., Riedel M.R., and Yuen D.A. Rheological structure and deformation of subducted slabs in the mantle transition zone: implications for mantle circulation and deep earthquakes. Phys. Earth Planet. Inter. 127 (2001) 83-108
18. Kaneshima S. Small-scale heterogeneity at the top of the lower mantle around the Mariana slab. Earth Planet. Sci. Lett. 209 (2003) 85-101
19. Dziewonski A.M., Ekstrom G., and Salganik M.P. Centroid-moment tensor solutions for July-September 1995. Phys. Earth Planet. Inter. 97 (1996) 3-13
20. Aki K., and Richards P.G. Quantitative Seismology: Theory and Methods (1980), Freeman
21. Kennett B.L.N., and Engdahl E.R. Travel times for global earthquake location and phase identification. Geophys. J. Int. 105 (1991) 429-465
22. Takenaka H., and Kennett B.L.N. A 2.5-D time-domain elastodynamic equation for plane-wave incidence. Geophys. J. Int. 125 (1996) F5-F9
23. Takenaka H., and Okamoto T. Teleseismic waveform synthesis for ocean-bottom stations using a new very effective 2.5-D finite difference technique. Proceedings of International Workshop on Scientific Use of Submarine Cables (1997) 23-26
24. Okamoto T. Teleseismic synthetics obtained from three-dimensional calculations in two-dimensional media. Geophys. J. Int. 118 (1994) 613
25. Yoshioka S., and Murakami T. The effects of metastable olivine (α) wedge in subducted slabs on theoretical seismic waveforms of deep earthquakes. J. Geophys. Res. 107 (2002) 10.1029/2001JB001223
26. Mosenfelder J.L., Marton F.C., Ross II C.R., Kerschhofer L., and Rubie D.C. Experimental constraints on the depth of olivine metastability in subducting lithosphere. Phys. Earth Planet. Inter. 127 (2001) 165-180
27. 4 determined by in situ synchrotron powder X-ray diffraction. Am. Mineral. 89 (2004) 285-293
28. Angel R.J., Frost D.J., Ross N.L., and Hemley R. Stabilities and equations of state of dense hydrous magnesium silicates. Phys. Earth Planet. Inter. 127 (2001) 181-196
29. Green II H.W. Tiny triggers deep down. Nature 424 (2003) 893-894
30. Tibi R., Wiens D.A., and Hildebrand J.A. Aftershock locations and rupture characteristics of the 1995 Mariana deep earthquake. Geophys. Res. Lett. 28 (2001) 4311-4314
31. Stein S. Deep earthquakes: a fault too big?. Science 268 (1995) 49
32. Wiens D.A., McGuire J.J., Shore P.J., Bevis M.G., Draunidalo K., Prasad G., and Helu S.P. A deep earthquake aftershock sequence and implications for the rupture of deep earthquakes. Nature 372 (1994) 540-543
33. Zhang J., Green II H.W., Bozhilov K., and Jin Z. Faulting induced by precipitation of water at grain boundaries in hot subducting oceanic crust. Nature 428 (2004) 633-636
34. Fischer K.M., Jordan T., and Creager K.C. Seismic constraints on the morphology of deep slabs. J. Geophys. Res. 93 (1988) 4773-4783
35. Fukao Y., Widiyantoro S., and Obayashi M. Stagnant slabs in the upper and lower mantle transition region. Rev. Geophys. 39 (2001) 291-323
36. Gaherty J.B., and Hager B.H. Compositional vs. thermal buoyancy and the evolution of subducted lithosphere. Geophys. Res. Lett. 21 (1994) 141-144
37. Riedel M.R., and Karato S. Grain-size reduction in subducted oceanic lithosphere associated with the olivine-spinel transformation and its effects on rheology. Earth Planet. Sci. Lett. 148 (1997) 27-43
38. Rubie D.C. The olivine->spinel transformation and the rheology of subducting lithosphere. Nature 385 (1984) 505-508
39. Wessel P., and Smith W.H. New Version of Generic Mapping Tools. EOS Trans. AGU Electron. Suppl. (Aug. 15 1995)