GLOBAL MAPPING OF TOPOGRAPHY ON THE 660-KM DISCONTINUITY

被引:218
作者
SHEARER, PM
MASTERS, TG
机构
[1] Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, San Diego
关键词
D O I
10.1038/355791a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
收藏
页码:791 / 796
页数:6
相关论文
共 56 条
[41]   SHEAR-WAVE TRAVEL TIME, AMPLITUDE, AND WAVE-FORM ANALYSIS FOR EARTHQUAKES IN THE KURILE SLAB - CONSTRAINTS ON DEEP SLAB STRUCTURE AND MANTLE HETEROGENEITY [J].
SCHWARTZ, SY ;
LAY, T ;
BECK, SL .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1991, 96 (B9) :14445-14460
[42]   SEISMIC IMAGING OF UPPER-MANTLE STRUCTURE WITH NEW EVIDENCE FOR A 520-KM DISCONTINUITY [J].
SHEARER, PM .
NATURE, 1990, 344 (6262) :121-126
[44]   HARMONIC SPLINES FOR GEOMAGNETIC MODELING [J].
SHURE, L ;
PARKER, RL ;
BACKUS, GE .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1982, 28 (03) :215-229
[45]   DEEP SLABS, GEOCHEMICAL HETEROGENEITY, AND THE LARGE-SCALE STRUCTURE OF MANTLE CONVECTION - INVESTIGATION OF AN ENDURING PARADOX [J].
SILVER, PG ;
CARLSON, RW ;
OLSON, P .
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, 1988, 16 :477-541
[46]   OBSERVATIONS OF BODY WAVE MULTIPATHING FROM BROAD-BAND SEISMOGRAMS - EVIDENCE FOR LOWER MANTLE SLAB PENETRATION BENEATH THE SEA OF OKHOTSK [J].
SILVER, PG ;
CHAN, WW .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1986, 91 (B14) :13787-13802
[47]  
SONDERGELD CH, 1977, B SEISMOL SOC AM, V67, P537
[48]  
STACEY FD, 1977, PHYSICS EARTH
[49]   LOWER MANTLE HIGH-VELOCITY ZONE BENEATH THE KURILS AS INFERRED FROM P-WAVE TRAVEL TIME AND AMPLITUDE DATA [J].
SUETSUGU, D .
JOURNAL OF PHYSICS OF THE EARTH, 1989, 37 (04) :265-295
[50]   LONG-WAVELENGTH S-WAVE VELOCITY STRUCTURE THROUGHOUT THE MANTLE [J].
TANIMOTO, T .
GEOPHYSICAL JOURNAL INTERNATIONAL, 1990, 100 (03) :327-336