Publications by Year: 2004

2004
Papadopoulos, T., Alexopoulos, J., & Voulgaris, N. (2004). New evidence for the seismotectonic environment of CW Attica, Greece. General Assembly of the 5th Asian Seismological Commission, Symposium on Seismic Hazard Evaluation and Risk Reduction. presented at the October 18-21, Yerevan, Armenia.Abstract
Deep seismic and gravity measurements were conducted along profiles in CW Attica to investigate the subsurface structure of the area that suffered heavy damages after the Mw=5.9 of September, 7th 1999 earthquake. Within the framework of this investigation the following tasks were accomplished: a) Three long seismic lines of about 10km each, two of which in the epicentral area of Thriassion plain (west part of Athens) and one along the Parnitha Mtn-Penteli Mtn axis (central part of Athens) and b) eight gravity profiles, comprising 338 gravity measurements, four of which in the Thriassion plain, three in the meizoseismal area of Petroupoli, Aharnes and Thrakomacedones (east of Parnitha Mtn) and one along the Parnitha Mtn-Penteli Mtn axis.
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Papadopoulos, T., Voulgaris, N., & Alexopoulos, J. (2004). Elaboration of GIS based multidisciplinary data for microzoning studies. 1st International Conference on Applied Geophysics for Engineering. presented at the October 2004, Messina, Italy.Abstract
The elaboration of analytical microzoning studies involves a multidisciplinary approach comprising geological, geotechnical, seismological, geophysical and dynamic soil analysis data. In an attempt to incorporate the maximum available amount of information and in the view of the continuously expanding use of GIS, as a tool for analyzing and integrating data, a new software environment called AUTOSEISMO-GEOTECH has been developed for handling these multi-parameter data. This user friendly package is presently implemented for the cities of Heraklion (Crete island) and Thiva (province of Beotia) in Greece.
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Pirli, M., Voulgaris, N., Alexopoulos, J., & Makropoulos, K. (2004). Installation and preliminary results from a small aperture seismic array in Tripoli, Greece. Bulletin of the Geological Society of Greece, XXXVI, 1499-1508.Abstract
A small aperture seismic array was installed by the University of Athens, in the area of Tripoli, Greece, on July 16th 2003, in order to test the performance of seismic array processing in the area of Greece and assess its contribution to earthquake location, especially in offshore areas not azimuthally covered by the existing, conventional seismological networks. The array consists of four three-component seismological stations, one of them in the middle of a small, almost equilateral triangle, formed by the deployment of the other three stations. Despite the fact that array siting is a compromise of array installation criteria, equipment safety and logistics, the test character of the experiment can be served successfully. The array transfer function depicts good azimuthal coverage nonetheless the existence of side-lobes and a rather wide main lobe is characteristic of spatial aliasing and low resolution in the two-dimensional wavenumber domain. The resolvable wavenumber passband of the array permits the determination of most of the common seismic body wave phases (Pn, Pg, Sn, Sg, etc.) for local and regional events in the area of Greece. Location of recorded events was performed using slowness and backazimuth data, calculated by f-k analysis of the seismic waveforms. Preliminary results have been compared to epicentres calculated by the Geodynamic Institute of the National Observatory of Athens. Although some differences are observed, these are not significant and location results as well as overall array performance can be improved by array calibration and travel-time, azimuth and slowness correction calculations.
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