Earthquake induced soil liquefaction index of Duzce province, in Turkey using probabilistic and statistical methods

Abstract

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. In the study area, the main reason for destruction is observed due to liquefaction and its settlements sequencely. As known, liquefaction occurs in sandy soils and presence of the underground water, in other words, soils in which the space between individual particles is entirely filled with water. In this research, probabilistic approach was used to determine the liquefaction potential index. For the study site, it was determined that the study area has very high seismic activity from the point of tectonic structure. Using probabilistic seismic risk analysis, the magnitude was estimated as 7.9. Utilizing this approach (Probabilistic), predicted magnitude and accelerations were calculated as 7.9 for magnitude and 0.42, 0.45, 0.55, 0.56, 0.72g for accelerations. In the first stage of the study, the dynamic stress ratio approach was exerted to the field data for SPT (N) to determine the liquefaction potential index and attained in Duzce region. Following this phase, the values of liquefaction potential indexes (LPI) were anticipated by this approach. Finally, the liquefaction maps were prepared according to the probabilistic earthquake approach.