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Dezful Embayment), which polluted some areas, forcing local people to leave their houses. Asmari oil samples from Masjid-e-Soleiman oilfield correlated with oil seeps from Seeberenj and Dare-Khersan and Asmari/ Jahrum reservoir oil from Naregsi oilfield correlated with Dalaki’s oil seepages by Gas Chromatography and Gas Chromatography-Mass Spectrometry. Dalaki’s oil seeps exhibit evidences of biodegradation and mix kerogens, this explains the low saturate fraction (29-38 %), the aromatic-asphaltic nature of the oil seeps and an important depletion in the homohopane series. The oil seeps are characterized by high predominance C 29 to C 30 hopane ratios (1.25-1.8), low ratios of C 34 over C 35 (1.42-1.62), and the low diasterane abundance (C 27 -C 29 Dia/Reg Steranes: 0.33-0.44). These characteristics suggest that the oil seeps originate from carbonate marine source rocks (Sañchez, C. & Permanyer, A., 2006). On the other hand the reservoir oil samples of Nargesi oilfield are characterized by high contents of saturates, Pr/Ph ratios below 2, the dominance of C 30 hopanes over the C 29 hopane (C 29 / C 30
2 Symposium 9: Natural Hazards and Risks .3 Sar Interferometric Point Target analysis and interpretation of aerial photographs for landslides investigations in southern switzerland Ambrosi Christian*, Strozzi Tazio** * SUPSI, Istituto Scienze della Terra CP 72, CH 6952 Canobbio (christian.ambrosi@supsi.ch) ** GAMMA Remote Sensing, Worbstrasse 225, CH 3073 Gümligen (strozzi@gamma-rs.ch) Information on landslide displacement from SAR Interferometric Point Target Analysis (IPTA) and sketch maps from aerial photography interpretation are combined for the study of landslides in Ticino, Southern Switzerland. For current ITPA investigations, ENVISAT and RADARSAT SAR acquisitions over the Swiss territory are used. Numerous unstable phenomena are considered in this mountainous region, with an elevation range from approximately 200 m a.s.l. to more than 3000 m a.s.l. The results achieved with IPTA are attractive to complement aerial photographs interpretation for the evaluation of the state of activity of landslides over villages and in sparsely vegetated areas with numerous exposed rocks. On the other hand, over vegetated areas (forests and meadows) IPTA failed to retrieve displacement information. Because displacement from InSAR is recorded along the satellite line-of-sight direction, IPTA cannot be directly use for the determination of the intensity of landslides in hazard mapping. In general, the actual displacement rate is larger than that recorded with InSAR. Over alpine areas characterized by sparse vegetation, where snow cover limits the availability of a large number of SAR acquisitions, conventional InSAR was successfully applied to estimate the motion of rockglaciers and other periglacial phenomena. For vegetated areas and relatively rapid landslides L-band InSAR (JERS-1 SAR and ALOS PALSAR) has been found to be an efficient solution. . Interdisciplinary approaches to recognition, analysis and modelling in sackung system and large landslides in southern Swiss Alps Ambrosi Christian*, Pera Sebastian* * SUPSI, Istituto Scienze della Terra CP 72, CH 6952 Canobbio (christian.ambrosi@supsi.ch) A very large Deep-Seated Gravitational Slope Deformations and large landslides, affecting the slopes of Swiss Southern Alps, have been recognised and mapped. Several active rotational and translational deep seated landslides occur in the lower part of the slopes, often in association with rockslides at different scale. These phenomena show a different stage of evolution along the flanks of the ridges. Some of these landslides (Pontirone, Osco, Faido) has been recognised through different techniques. In particular, it has been characterised by aerial photo interpretation, field surveys, tracer tests and analysis of detailed airborne Lidar DEM. Rock masses, including poly-deformed orthogneisses, paragneisses and dolostones, are affected by systems of impressive gravitational morpho-structures including ENE trending open trenches, scarps and counterscarps forming graben-like structures. Geodetic measurements (optical targets and GPS points) and satellite radar interferometry (DinSAR) data demonstrate the activity of the gravitational features affecting both the upper and lower part of the slopes. The analysis of geological, geomorphological, hydrogeological, in situ stress, geodetic and uplift data, have been used to demonstrate the possible relationships among geological, structural, topographic and gravitational features. Numerical 2D modelling have been used to evaluate failure in presence of elastic, elasto-plastic materials and groundwater flow. This allow to verify “model” sensitivity to some factors as slope geometry, structural features, groundwater conditions and to determinate the triggers factors of these instabilities. On this basis we discuss the possibility that the geological, tectonic and hydrogeological framework can play an active/passive role in the onset and development of the sackung system and related landslides.
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Abstract Volume 6 th Swiss Geoscien
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2 Plenary Session
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6 Plenary Session 3 Annual Opening
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3 8 INDEX Index A Abbühl L. 156, 1
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