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| CONDUCTIVITY DISCONTINUITIES IN THE UPPER-MANTLE BENEATH A STABLE CRATON |
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| Author(s): SCHULTZ A, KURTZ RD, CHAVE AD, JONES AG |
| Source: GEOPHYSICAL RESEARCH LETTERS Volume: 20 Issue: 24 Pages: 2941-2944 Published: DEC 23 1993 |
| Times Cited: 75 References: 17 |
| Abstract: We present evidence for approximate collocation of seismic and electrical transitions in the upper mantle. More than two years of very long period magnetotelluric (MT) data were recorded at a lakebottom observatory in the central Canadian Shield. After processing to contend with non-stationary source effects, and removal of galvanic distortion, the underlying structure is ID for periods of one hour to four days. The response was extended to periods of 100 days by appending Geomagnetic Depth Sounding data to the MT curves. Minimum structure linearised inversion, nonlinear extremal inversion, and a new genetic algorithm for nonlinear hypothesis testing, reveal discrete jumps in conductivity at depths near the major upper mantle seismic discontinuities. The jumps occur over limited depth ranges. |
| Document Type: Article |
| Language: English |
| Reprint Address: SCHULTZ, A (reprint author), UNIV CAMBRIDGE, INST THEORET GEOPHYS, DEPT EARTH SCI, DOWNING ST, CAMBRIDGE CB2 3EQ, ENGLAND |
Addresses:
1. GEOL SURVEY CANADA, OTTAWA K1A 0Y3, ON CANADA
2. WOODS HOLE OCEANOG INST, WOODS HOLE, MA 02543 USA |
| Publisher: AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 |
| Subject Category: Geosciences, Multidisciplinary |
| IDS Number: MQ173 |
| ISSN: 0094-8276 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |