Earthquakes beneath the Himalayas and Tibet: Evidence for strong lithospheric mantle

Science

Volumn 304, Issue 5679, 2004, Pages 1949-1952

  Chen, Wang Ping ^a   Yang, Zhaohui ^a  

^a UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ELASTICITY; OCEANOGRAPHY; SEISMOLOGY;

ELASTIC STRAIN; LITHOSPHERE; MANTLE;

EARTHQUAKES;

EARTHQUAKE HYPOCENTER; ELASTIC MODULUS; FOCAL MECHANISM; LITHOSPHERE; MANTLE; STRAIN;

AMPLITUDE MODULATION; ARTICLE; CHINA; CONTINENTAL SHELF; EARTHQUAKE; ELASTICITY; GEOLOGY; METAMORPHOSIS; OCEANIC REGIONS; PRIORITY JOURNAL; SIGNAL NOISE RATIO; VELOCITY;

ASIA; CHINA; EURASIA; FAR EAST; HIMALAYAS; XIZANG;

EID: 3042663026     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1097324     Document Type: Article

References (31)

1. P. Molnar, P. England, J. Martinod, Rev. Geophys. 31, 357 (1993).
2. L. H. Royden et al., Science 276, 788 (1997).
3. C. Beaumont, R. A. Jamieson, M. H. Nguyen, B. Lee, Nature 414, 738 (2001).
4. P. K. Zeitler et al., Geol. Soc. Am. Today 11, 4 (2001).
5. W.-P. Chen, P. Molnar, J. Geophys. Res. 88, 4183 (1983).
6. P. Molnar, W.-P. Chen, J. Geophys. Res. 88, 1180 (1983).
7. W. F. Brace, D. L. Kohlstedt, J. Geophys. Res. 85, 6248 (1980).
8. S. J. Mackwell, M. E. Zimmerman, D. L. Kohlstedt, J. Geophys. Res. 103, 975 (1998).
9. E. R. Engdahl, R. ven der Hilst, R. Buland, Bull. Seismol. Soc. Am. 88, 722 (1998).
10. C. H. Chapman, J.-Y. Chu, D. G. Lyness, in Seismological Algorithms: Computational Methods and Computer Programs, D. J. Doornbos, Ed. (Academic Press, San Diego, CA, 1988), pp. 47-74.
11. C. A. Langston, D. V. Helmberger, Geophys. J. R. Astron. Soc. 42, 117 (1975).
12. J. L. Nábelek, thesis, Massachusettts Institute of Technology, Cambridge, MA (1984).
13. In this notation, an uppercase letter denotes a segment of seismic ray that leaves the earthquake source region as a downgoing P or S wave. These rays. travel to far stations 30° to 90° away ("teleseismic distances") with little complication that arises from major seismic discontinuities bounding the mantle transition zone or from the core-mantle boundary. For each depth phase, the first lowercase letter marks an upgoing ray as it leaves the source at a steep angle. The ray reflects off the free surface and then continues downward toward the station. As such, to a good approximation, the differential timing between pP and P phases is simply twice the ratio between the focal depth h and the average P-wave speed between the earthquake and the surface. In cases where either the presence of noise or the limited dynamic range of analog recording hinders detailed modeling of waveforms, we measure differential timing between available depth phases and direct arrivals as supplemental constraints on focal depths (table S2).
14. J. A. Mejia, thesis, St Louis University, St Louis, MO (2001).
15. X.-H. Yuan, J. Ni, R. Kind, J. Mechie, E. Sandvol, J. Geophys. Res. 102, 27491 (1997).
16. G. Peglar, S. Das, Geophys. J. Int. 134, 573 (1998).
17. G. Wittlinger et al., Earth Planet. Sci. Lett. 221, 117 (2004).
18. G. Zandt, S. C. Myers, T. C. Wallace, J. Geophys. Res. 100, 10S29 (1995).
19. See supporting material on Science Online.
20. B. Isacks, P. Molnar, Nature 233, 1121 (1969).
21. W.-P. Chen, H. Kao, in The Tectonic Evolution of Asia, A. Yin, M. Harrison, Eds. (Cambridge Univ. Press, Palo Alto, CA, 1996), pp. 37-62.
22. G. Ekström, thesis, Harvard University, Cambridge, MA (1987).
23. L. Zhu, D. V. Helmberger, Geophys. Res. Lett. 23, 435 (1996).
24. J. Jackson, Geol. Soc. Am. Today 12, 4 (2002).
25. N. M. Shapiro, V. Levin, M. H. Ritzwoller, P. Molnar, J. Park, Eos 83, FMS61D (2002).
26. T. J. Owens, G. Zandt, Nature 387, 37 (1997).
27. L. Zhu, thesis, California Institute of Technology, Pasadena, CA (1998).
28. V. Gaur, S. Mitra, K. Priestley, Eos 83, FMS51B (2002).
29. A. Maggi, J. A. Jackson, D. McKenzie, K. Priestley, Geology 28, 49S (2000).
30. W.-P. Chen, J. L. Nábelek, T. J. Fitch, P. Molnar, J. Geophys. Res. 86, 2863 (1981).
31. Supported by the U.S. NSF. This is project Hi-CLIMB contribution 102.