Nature 355, 791 - 796 (27 February 1992); doi:10.1038/355791a0

Global mapping of topography on the 660-km discontinuity

Peter M. Shearer & T. Guy Masters

Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, USA

Long-period precursors to the SS seismic phase are used to produce global maps of topography for the discontinuity at 660 km depth in the upper mantle. These maps indicate discontinuity depth variations of up to 30 km and suggest a correlation between regional depressions in the 660-km discontinuity and subduction zones—a result more consistent with models in which the subducting slabs are deflected horizontally at the discontinuity than with models of unhindered slab penetration into the lower mantle.

References

1.	Silver, P. G., Carlson, R. W. & Olson, P. Ann. Rev. Earth planet. Sci. 16, 477−541 (1988). | ChemPort |
2.	Machetel, P. & Weber, P. Nature 350, 55−57 (1991). | Article | ISI |
3.	Niazi, M. & Anderson, D. L. J. geophys. Res. 70, 4633−4640 (1965).
4.	Johnson, L. R. J. geophys. Res. 72, 6309−6325 (1967). | ISI |
5.	Liu, L.-G. Nature 262, 770−772 (1976). | Article | ISI | ChemPort |
6.	Jackson, I. Earth planet. Sci. Lett. 62, 91−103 (1983). | Article | ISI | ChemPort |
7.	Ito, E., Takahashi, E. & Matsui, Y. Phys. Earth planet. Inter. 67, 238−248 (1984). | ChemPort |
8.	Jeanloz, R. in Mantle Convection: Plate Tectonics and Global Dynamics (ed. Peltier, W. R.) 203−259 (Gordon and Breach, New York, 1989).
9.	Duffy, T. S. & Anderson, D. L. J. geophys. Res. 94, 1895−1912 (1989). | ISI | ChemPort |
10.	Jeanloz, R. Geophys. Res. Lett. 18, 1743−1746 (1991).
11.	Gurnis, M. & Hager, B. H. Nature 335, 317−321 (1988). | Article | ISI |
12.	Christensen, U. R. & Yuen, D. A. J. geophys. Res. 89, 4389−4402 (1984). | ChemPort |
13.	Jordan, T. H. J. geophys. Res. 43, 473−496 (1977).
14.	Creager, K. C. & Jordan, T. H. J. geophys. Res. 89, 3031−3049 (1984). | ISI |
15.	Creager, K. C. & Jordan, T. H. J. geophys. Res. 91, 3573−3589 (1986).
16.	Fischer, K. M., Creager, K. C. & Jordan, T. H. J. geophys. Res. 96, 14403−14427 (1991).
17.	Kimaya, S., Miyatake T. & Hirahara, K. Geophys. Res. Lett. 15, 829−831 (1988).
18.	Suetsugu, D. J. Phys. Earth 37, 265−295 (1989).
19.	Zhou, H. & Clayton, R. W. J. geophys. Res. 95, 6829−6851 (1990).
20.	van der Hilst, R., Engdahl, R., Spakman, W. & Nolet, G. Nature 353, 37−43 (1991). | Article |
21.	Fukao, Y., Obayashi, M., Inoue, H. & Nenbai, M. J. geophys. Res. (in the press).
22.	Revenaugh, J. & Jordan, T. H. J. geophys. Res. 94, 5787−5813 (1989).
23.	Richards, M. A. & Wicks, C. W. Geophys. J. Int. 101, 1−35 (1990).
24.	Revenaugh, J. & Jordan, T. H. J. geophys. Res. 96, 19763−19780 (1991).
25.	Shearer, P. M. Nature 344, 121−126 (1990). | Article | ISI |
26.	Shearer, P. M. J. geophys. Res. 96, 18147−18182 (1991). | ISI |
27.	Dziewonski, A. M. & Anderson, D. L. Phys. Earth planet. Inter. 25, 297−356 (1981). | Article | ISI |
28.	Woodward, R. L. & Masters, G. J. geophys. Res. 96, 6351−6377 (1991).
29.	Efron, B. & Tibshirani, R. Science 253, 390−395 (1991).
30.	Shure, L. Parker, R. L. & Backus, G. E. Phys. Earth planet. Inter. 28, 215−229 (1982). | Article | ISI |
31.	Ito, E. & Yamada, H. High-Pressure Research in Mineral Physics (ed. Akimoto, S. & Manghnani, M. H.) 405−419 (Center for Academic Publications, Tokyo, 1982).
32.	Ito, E. & Takahashi, E. J. geophys. Res. 94, 10637−10646 (1989). | ISI |
33.	Ito, E., Akaogi, M., Topor L. & Navrotsky, A. Science 249, 1275−1278 (1990). | ISI | ChemPort |
34.	Masters, G., Jordan, T. H., Silver, P. G. & Gilbert, F. Nature 298, 609−613 (1982). | Article | ISI |
35.	Woodhouse, J. H. & Dziewonski, A. M. J. geophys. Res. 89, 5953−5986 (1984). | ISI |
36.	Tanimoto, T. Geophys. J. Int. 100, 327−336 (1990).
37.	Masters, G. & Bolton, H. Eos 72, 316 (1991).
38.	Ekström, G., Dziewonski, A. M. & Ibañez, J. Eos 71, 1462 (1990).
39.	Zhou, H., Anderson, D. L. & Clayton, R. W. J. geophys. Res. 95, 6799−6827 (1990).
40.	Schwartz, S. Y., Lay, T. & Grand, S. P. Geophys. Res. Lett. 18, 1265−1268 (1991).
41.	Schwartz, S. Y., Lay, T. & Beck, S. L. J. geophys. Res. 96, 14445−14460 (1991).
42.	Gaherty, J. B., Lay, T. & Vidale, J. E. J. geophys. Res. 96, 16349−16367 (1991).
43.	Silver, P. & Chan, W. J. geophys. Res. 91, 13787−13802 (1986).
44.	Beck, S. L. & Lay, T. Geophys. Res. Lett. 13, 1007−1010 (1986).
45.	Lay, T. & Young, C. J. Geophys. Res. Lett. 16, 605−608 (1989).
46.	Giardini, D. & Woodhouse, J. H. Nature 307, 505−509 (1984). | Article | ISI |
47.	Giardini, D. & Woodhouse, J. H. Nature 319, 551−555 (1986). | Article |
48.	Hamburger, M. W. & Isacks, B. L. J. geophys. Res. 92, 13841−13854 (1987).
49.	Fitch, T. J. Phys. Earth planet. Inter. 26, 156−166 (1975).
50.	Frohlich, C. & Barazangi, M. Phys. Earth planet. Inter. 21, 1−14 (1980). | Article |
51.	Zhou, H. Phys. Earth planet. Inter. 61, 199−229 (1990) | Article |
52.	Sondergeld, C. H., Isacks, B. L., Barazangi, M. & Billington, S. Bull. seismol. Soc. Am. 67, 537−541 (1977).
53.	Bock, G. Phys. Earth planet. Inter. 25, 360−371 (1981). | Article |
54.	Hager, B. H. & Raefsky, A. Eos 62, 1074 (1981).
55.	Ringwood, A. E. & Irifune, T. Nature 331, 131−136 (1988). | Article | ISI | ChemPort |
56.	Stacey, F. D. Physics of the Earth (Wiley, New York, 1977).