Peculiarities of the deep structure of the lithosphere in the northeastern part of the Indian Ocean |
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| Authors: | E L Mazo A A Shreider M P Kulikova D A Gilod Al A Shreider |
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| Institution: | 1.Faculty of Geology,Moscow State University,Moscow,Russia;2.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The seismicity of the northeastern part of the Indian Ocean in connection with the general structural peculiarities of the
main tectonic structures of the bottom is presented. The three main ranges of higher seismic activity at the depths of 0–17,
20–27, and 32–35 km divided by aseismic layers are revealed. The seismic activity at depths of more than 35 km is almost not
detected both for the ocean and for the Indian peninsula. The nature of the distribution of the seismicity as such in the
lithosphere is discussed. Using the results of anomalous au]gravitational field transformations, the prolongation of the East
Indian Ridge structure is revealed to 19 degrees north, while the relationship of the Afanasy Nikitin Rise and the 85th Degree
Ridge is not reflected at the tranforms. In the Cocos Basin, the mutually perpendicular disturbance zones of northeastern
and northwestern strike, as well as the point of their crossing, where the maximal number of earthquake foci are concentrated,
are distinguished. A conclusion concerning the substantial disturbance of the strength properties of the lithosphere in this
zone as a consequence of the geodynamical processes, which are accompanied by fracture tectonics, is reached. |
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