Soil liquefaction induced settlements with interaction of earthquake hazard analysis in vicinity Duzce city (Turkey)
Onur Uğur, Latif
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Duzce City (Turkey) is in a tectonically active location that is particularly affected by the northern branch of the North Anatolian Fault Zone. The 12 November 1999 Duzce earthquake (the earthquake had magnitudes MW of 7.2) in Turkey caused a huge destruction and hazard for Duzce in Turkey sites in the Western Black Sea Region. Magnitudes 7.2 and 6.9 earthquakes in 1999 caused great destruction in Duzce. In study area, The heavy damage to buildings and other civil engineering structures was mainly due to liquefaction-induced settlement and site effects such as amplification. In the structure of the this research, probabilistic and deterministic approaches were used to determine the liquefaction induced settlement for several earthquake parameters. Utilizing by deterministic seismic risk analysis, the magnitudes were estimated for the two different rupture (with two different fault lengths, 74, 36 km) model of North Anatolian Fault Zone in the Western Black Sea Region. Utilizing the approaches (deterministic and Probabilistic), predicted magnitudes and accelerations of earthquakes were taken into account as alternatively 6.9, 7.2, 7.9 for magnitudes and 0.27, 0.35, 0.4, 0.42, 0.45, 0.46, 0.55, 0.56, 0.72g for accelerations. For several design earthquakes, in the first stage of the study of liquefaction, the dynamic stress ratio approach was exerted to the field data for SPT (N) to determine the soil liquefaction induced settlements and attained in Duzce region. Following this phase, the values of liquefaction induced settlements were anticipated with this approach. In the first phase of this study, the soil liquefaction potential index (LPI) and the liquefaction induced soil settlement were estimated due to probabilistic and deterministic approaches. Finally, the maps liquefaction induced settlements were obtained and drawn.
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