No abstract

Detailed single-channel seismic reflection survey has been carried out in the Lakonikos Gulf, Southern Péloponnèse, aiming to a better understanding of the neotectonic structure of the Lakonikos Basin. Our survey showed that, contrary to the model of a simple N-S asymmetric graben previously considered, a tectonic horst occurs within the tectonic graben of Lakonikos. A subsidence of more than 1000m is produced by the N-S marginal faults, whereas, the N-S faults creating the central horst structure within the Lakonikos graben are high-angle reverse faults, which have uplifted the sea bottom together with the Pleistocene and Holocene sediments by about 100m. Several E-W vertical transcurrent faults, with strike-slip motion deform the N-S structures. The central tectonic horst structure is very recent as the observed deformation of the Upper Pleistocene and Holocene sediments indicated and a transtensional geodynamic regime is suggested.

In the westernmost region of the rapidly widening Corinth rift, Greece, extensive development of roads, bridges and other human infrastructure has caused continuous environmental change over the past twenty years. River networks, the land surface and the coastal environment, have been altered, especially in the areas corresponding to deltaic fans. In this paper we use earth observation systems that have captured these environmental changes, particularly medium (Landsat TM and ETM+) and high (Quickbird) resolution satellite images, to identify environmental changes between the periods 1992, 2000, 2002, and 2005. Six pseudo-color multi-temporal images in different spectral areas were created in order to detect changes to the terrestrial and coastal environment caused mainly by direct or indirect human impact. This methodology provided new data for quantifying significant alterations in the environment on different scales. In many cases this revealed their sequence during the time of observation.

The study of Athens 09.07.1999 earthquake (Ms =5.9), which occurred in the area of the NW Attica peninsula within the Thriasio neotectonic basin, shed light to the complicated active tectonic structure of Attica. The geological, gravity and magnetic data, as well as the results of InSAR analysis were jointly considered for a better understanding of the block tectonics and kinematics of the meisoseismal area, as well as block geodynamic related to the seismic event. The deep tectonic structure is characterized by existence of small (up to 20km) dimensions uplifted and subsided blocks of Paleozoic basement that defined the characteristic tectonic pattern of the area. The largest values of co-seismic subsidence, derived from InSAR analysis, are observed within the subsided blocks of epicentral area. This evidence, together with the results of field microtectonic observations, implies that this ensemble of blocks, during the seismic event, moved in accordance with block kinematics and under the approximately N-S tension, which is characteristic for Attica on its neotectonic history ranging from Mid Pleistocene to date