An extended GIS-based Dempster–Shafer theory for play-based hydrocarbon exploration risk analysis under spatial uncertainty conditions,case study: Zagros sedimentary basin,Iran

This research proposes a geospatial information system (GIS)-based framework extending the Dempster–Shafer theory to manage spatial uncertainties in the hydrocarbon exploration process. The output would be a composite common risk segment (CCRS) map which categorised the study area according to the exploration risk and interval uncertainties computed by the proposed model in the GIS environment. This exhibits the quantity of the entire Dempster–Shafer functions for the hydrocarbon resources in the potential areas in the Fars domain, Zagros sedimentary basin in the central part of Iran. The produced CCRS outlines approximately 25.9% of the study area which is highly promising for the hydrocarbon potential reservation. The accuracy of the model was validated using the area under curve. It was observed that 79.6% were classified correctly for the training and 73.4% for the testing data by the applied model. According to the obtained results, the proposed knowledge guided – data-driven method enhanced the precision of the classification more than the data-driven or knowledge-driven methods separately.     

Numerical investigation into the effects of geometrical and loading parameters on lateral spreading behavior of liquefied layer

Numerical simulation of liquefaction-induced lateral spreading in gently sloped sandy layers requires fully coupled dynamic hydro-mechanical analysis of saturated sandy soil subjected to seismic loading. In this study, a fully coupled finite element model utilizing a critical-state two-surface-plasticity constitutive model has been applied to numerically investigate the effects of surface/subsurface geometry on lateral spreading. Using a variable permeability function with respect to excess pore pressure ratio is another distinctive feature of the current study. The developed code has been verified against the results of the well-known VELACS project. Lateral spreading phenomenon has been the focus of an extensive parametric study using the developed code. Numerical modeling of three different geometrical forms of surface and subsurface of liquefiable layer indicates that the amount and direction of lateral spreading are noticeably affected by the geometrical conditions. Also, parametric studies by the developed numerical model show that the effects of layer height, maximum ground acceleration, and loading frequency on the level of lateral spreading are significantly different for the examined geometrical condition.     

Investigating the influence of soil conditions and surcharge mass on seismic responses of ground surface

Journal of Seismology - Earthquake is always known as a natural phenomenon with complex and unpredictable characteristics. One of the parameters which affects the ground motion properties is soil....     

Correction to: Investigating the influence of soil conditions and surcharge mass on seismic responses of ground surface

Journal of Seismology -