scholarly journals Crustal structure of the Gulf of Corinth in Central Greece, determined from magnetotelluric soundings

1997 ◽  
Vol 40 (1) ◽  
Author(s):  
G. Chouliaras ◽  
V. N. Pham ◽  
D. Boyer ◽  
P. Bernard ◽  
G. N. Stavrakakis
Keyword(s):  
Electrical Properties ◽  
Crustal Structure ◽  
Upper Mantle ◽  
Magnetotelluric Sounding ◽  
Crust And Upper Mantle ◽  
Magnetotelluric Soundings ◽  
Central Greece ◽  
Gulf Of Corinth ◽  
Conductive Zone ◽  
Epicentral Region

The magnetotelluric sounding method at 15 sites was employed to investigate the electrical properties of the crust and upper mantle near the epicentral region of the June 15 1995, Ms = 6.1, destructive earthquake in the Gulf of Corinth, Central Greece. The magnetotelluric results indicate the presence of a conductive zone in the mid-crust at a depth of 9 to 12 km near the seismogenetic region. The existence of this zone with a thickness of around 7 km can be explained by the presence of fluids in a zone of ductile shear. A second electrical discontinuity was also found at a depth of about 28 km and this may well correspond to the Moho below the Gulf of Corinth.

scholarly journals A Seismic Refraction Study of the Crust and Upper Mantle in the Vicinity of Bass Strait

1969 ◽  
Vol 22 (5) ◽  
pp. 573 ◽  
Author(s):  
R Underwood
Keyword(s):  
Crustal Structure ◽  
Upper Mantle ◽  
Seismic Refraction ◽  
Travel Times ◽  
Crust And Upper Mantle ◽  
Australian Institute ◽  
First Arrival Travel Times ◽  
First Arrival ◽  
Future Work

A reconnaissance seismic refraction study of the crust and upper mantle of Bass Strait and adjacent land was undertaken in 1966 under the sponsorship of the Geophysics Group of the Australian Institute of Physics. The shot locations and times, the station locations, distances, and first arrival travel times are presented. Analysis of these data is described; they indicate a P n velocity below 8 km sec-I. Time terms are less than expected and do not agree with previous work. Crustal thicknesses cannot be computed until studies of upper crustal structure are made. These, and several mantle refraction studies, are suggested for future work.

Electric Structure of Crust and Upper Mantle Beneath the Bangong-Nujiang Suture in Tibet from Magnetotelluric Sounding

2009 ◽  
Vol 52 (5) ◽  
pp. 1156-1165 ◽  
Author(s):  
Sheng JIN ◽  
Wen-Bo WEI ◽  
Gao-Feng YE ◽  
Ming DENG ◽  
Han-Dong TAN ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Magnetotelluric Sounding ◽  
Crust And Upper Mantle ◽  
Electric Structure

GEOLOGICAL SURVEY INVESTIGATIONS OF THE ELECTRICAL PROPERTIES OF THE CRUST AND UPPER MANTLE

Geophysics ◽  
1966 ◽  
Vol 31 (6) ◽  
pp. 1078-1087 ◽  
Author(s):  
G. V. Keller ◽  
L. A. Anderson ◽  
J. I. Pritchard
Keyword(s):  
Electrical Properties ◽  
Upper Mantle ◽  
Marked Decrease ◽  
Sedimentary Rocks ◽  
Geological Survey ◽  
Metamorphic Rocks ◽  
Crust And Upper Mantle ◽  
Resistivity Measurements ◽  
Electrical Methods ◽  
Mohorovičić Discontinuity

The electrical properties of rocks deep in the crust and in the upper part of the mantle may be studied with various electrical methods. The U. S. Geological Survey has conducted such studies using three methods: conventional galvanic resistivity surveys, inductive resistivity surveys using the magnetotelluric field, and the measurement of electrical properties of rock samples at high temperatures. By combined sample measurements, galvanic resistivity measurements and magnetotelluric studies, the resistivity profile through the crust and upper mantle may be defined more closely than has been possible previously. We have recognized the existence of a heterogeneous surface layer consisting of sedimentary rocks and weathered igneous and metamorphic rocks. Within the crust, a marked decrease in resistivity is sometimes observed at depths of about 10 kilometers, perhaps corresponding to the Conrad discontinuity sometimes recognized by seismologists. It has not been possible to recognize an electrical boundary at depths corresponding to those at which the Mohorovičić discontinuity is noted by seismologists. However, a marked decrease in electrical resistivity occurs at somewhat greater depths, between 60 and 100 km.

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