Natural Resources Management and Agricultural Engineering

The focus of investigation in this paper is the reconstruction of different fault plane conditions and the primary interpretation of them, based on terrestrial close range LiDAR (Light Detection and Ranging) data. For reconstruction the slip per event along the bedrock scarp and where possible (e.g. postglacial scarp) an estimate regarding the slip rate of the individual faults we used the backscattered signal of the laser beam, the geomorphological geometry and the fault plane conditions. In this paper we discuss the N-S striking normal fault near Archanes in the Heraklion basin. To the north of this fault
zone the ancient Minoan temple Anemospillia (caves of the wind) is located, which was destroyed by an earthquake around 1700 BC and forms the nearest seismic source to the site.

Northern Attica in Greece is characterized by a set of north dipping, subparallel normal faults. These faults were considered to have low tectonic activity, based on historical earthquake reports, instrumental seismicity and slip rate estimates. This study presents new data for one of these faults, the Milesi Fault. We run GIS based geomorphological analyses on fault offset distribution, field mapping of postglacial fault scarps and ground penetrating radar profiling to image hangingwall deformation. The first palaeoseismological trenching in this part of Greece allowed obtaining direct data on slip rates and palaeoearthquakes. The trenching revealed downthrown and buried palaeosols, which were dated by radiocarbon. The results of our investigations show that the slip rates are higher than previously thought and that at least four palaeoearthquakes with magnitudes of aroundM6.2 occurred during the last 4000–6000 yr.We calculate an average recurrence interval of 1000–1500 yr and a maximum throw rate of ∼0.4– 0.45 mm a−1. Based on the new geological earthquake data we developed a seismic hazard scenario, which also incorporates geological site effects. Intensities up to IX must be expected for Northern Attica and the southeastern part of Evia. Earthquake environmental effects like liquefaction and mass movements are also likely to occur. This scenario is in contrast to the official Greek seismic hazard zonation that is based on historical records and assigns different hazard zones for municipalities that will experience the same intensity by earthquakes on the Milesi Fault. We show that the seismic hazard is likely underestimated in our study area and emphasize the need to incorporate geological information in such assessments

I. Papanikolaou (1,2), G. Migiros (1), G. Stamatis (1), and G. Yoxas (3) (1) Laboratory of Mineralogy & Geology, Department of Geological Sciences and Atmospheric Environment, Agricultural University of Athens, 75 Iera Odos Str., 118 55 Athens - GR (bagm@aua.gr) , (2) Benfield-UCL ...

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A massive groundwater coastal gushing spring with an annual freshwater discharge rate that exceeds 7*106m3 has been mapped within the Messiniakos Gulf in the Kalogrias bay and Kardamili-Mani (southern Peloponnese), approximately 100m from the coastline. The mechanism that supports this high discharge rate is not only of exceptional scientific interest due also to its complexity, but its potential exploration would be crucial for the future survival, economic development and prosperity of a large part of the Mani peninsula. The sea bottom morphology has an ovoid shape with the deepest part at 29m towards the gushing spring, it is characterized by important linear morphologic features in a rather unstable geologic environment of carbonate bedrock which is covered by a thin layer of semi-cohesive sediments. The study area belongs to the Geotectonic Unit of Mani that covers a large part of the Taygetos mountain and forms the predominant water supply source for all karstic springs of Man...