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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:57 |
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Conference: Bucharest University Faculty of Physics 2007 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Lateral structure in the Mediterranean Region using array records
Authors:
Felix Borleanu, Daniela Ghica, Mihaela Popa, Mircea Radulian
Affiliation:
NATIONAL INSTITUTE FOR EARTH PHYSICS
E-mail
felix@infp.ro
Keywords:
array, BURAR, lateral strucure
Abstract:
Array processing techniques can chararcterize the details of arriving seismic
waves front for different wave types. We applied one of this techniques, f-k analysis, to estimate azimuth and slowness systematic deviations and to detect significant lateral variations in the lithosphere structure.
The analysis of the lateral inhomogeneity in the Mediterranean area shows how essential is to compute the azimuth and slowness deviations to estimate station corrections in order to improve the location quality. To this aim, data recorded by Bucovina station were considered.
Bucovina array (BURAR) is a high-quality monitoring system consisting of 10
elements located in the Northern part of Romania, in South-Eastern Carpathians.
Data are collected from earthquakes located at regional distance, within a radius
of approx. 2000 km around BURAR site. We selected events with magnitude larger then 4 with sufficiently high signal/noise ratio, during 2004-2007 time interval.
The distribution of the earthquakes shows strong inhomogeneous azimuth coverage: the majority of the earthquakes occurred in the Southern part relative to BURAR.
Significant and systematic deviations in azimuth and slowness are emphasized. For comparison the same technique was applied in case of other two arrays, one located in Ukraine (AKASG) and the other one in Turkey (BRTR).
Our study indicates the existence of significant lateral inhomogeneities in the lithosphere which can be interpreted in terms of the particular seismotectonics of the region crossed by seismic rays.
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