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In this study, landslide susceptibility analysis of Çayeli Region (Rize) was performed by using statistical analysis methods. By preparing a 1/25000 scale geological map of Çayeli Region, lithostratigraphic units were seperated from oldest to youngest as follows; Hem^indere Formation (Santoniyen-Maastrihtiyen), Kaçkar Granitoid (Late Maastrihtiyen), Melyat Formation (Early-Middle Eosen), Pazar Formation (Sarmatian) and alluvium (Quaternary). Surficial weathering, on rocks of study area where climatic conditions presence to be on first place, has great importance. In the region, due to triggering of heavy rainfalls on 23rd of July 2002 and during the a couple of days, numerous landslides occured especially highly and completely weathered rocks. Inventory maps of these landslides were prepared by field works. In this study, data obtained from different sources were evaluated by Geographical Information Systems (GIS) and Remote Sensing (RS) techniques. Landslide susceptibility maps were produced using bivariate statistical analysis (BSA) and logistic regression analysis (LRA). On these susceptibility maps, five different susceptibility area were seperated. These are as follows; very low, low, medium, high and very high susceptible area. Performance analysis of these maps were carried out by comparing the actual landslides. On susceptibilty maps, produced with BSA 15 % of total area and 81 % of landslides, produced by LRA 19 % of total area and 92 % present landslides were determined as susceptible, high and very high susceptible areas. According to the results obtained from both analysis, performance analysis of susceptibility maps showed that these produced maps are suitable for use. LRA result where parameters evaluated all together and have higher performance might be preferred relatively. However, in future true performance of produced maps, will be evaluated when similar case of July 2002 meteorological event was happened. Key Words: Landslide susceptibility map, inventory map, Geograpgical Information Systems, Bivariate statistical analysis, Logistic regression analysis
Investigation of The Planned Route of The Southern Highway Between Danca (Akçaabat) - Yah Mahallesi (Trabzon) In Terms of Engineering Geology Engineering properties of the rock units exposed at the planned route of the Trabzon southern highway between Danca (Akçaabat) and Yah Mahallesi (Trabzon) were determined by field and laboratory studies. For this purpose, a general geologic map of 40 km2 area including the planned bypass route on Trabzon F43-d4, G43-al and G43-a2 sheets were propered. Four different geologic units were subsequently identified from oldest to yungest as andesite-basalt and their pyroclastics interbedded with limestone and marl of Upper Cretaceous age, andesite-basalt and their pyroclastics interbedded with marl and limestone of Eocene age and terraces and alluviums of Quternary age. An engineering geologic map of 1/10.000 scale was prepared on the basis of the lithologic units and their weathering and five areas were outlined. These areas consist of moderatly weathered agglomerates (1st area), weakly weathered agglomerates (2nd area), weakly weathered basalt (3rd area) moderatly weathered tuff (4* area) and weathered breccia (5th area). The engineering and physico-mechanic properties of the rock units in each area were determined by field measurements and laboratory tests. Besides, geomechanic classification of the rock bodies was carried out and the rock bodies were examined in terms of slope stabilities and their us as foundation and tunnel rock. In addition, durabilities of the rock units were found by ampiric HOEK-BROWN Mure creteria. Key Words: Highway (bypass), Weathering, Geomechanic, Classification, Rock Mass Strength vn