出版社：geodynamics Research International Bulletin Online
摘要：The Kotli area is a part of sub to lower Himalayas, and lies to the south east of the great syntaxial bend. The main objective of the present work was to test the site response analysis to interpret the damping effects after Muzaffarabad, 2005 earthquake on soils deposited at four sites (Fatehpur, Bernala, Plandri, Shensha) of Disstt. Kotli, NW of Pakistan. In the study areas, the site response at the vertical seismograph arrays of Kashmir earthquake (1995) having PGA of 0.017 was analyzed and it is scaled to PGA value of Muzaffarabad Earthquake. A non-Linear program is used, and site response models (damping curves, stress to strain curves, strain energy curves, frequency response curves and acceleration response curves) were constructed using shear and compression wave velocity profiles from upholes, and geotechnical data available at the four sites. In this analysis, other nonlinear and geometrical effects like stiffness reduction and liquefaction were neglected. By using soil parameters, a new damping curves for soils are constructed for the four different sites. The four areas are tested for response spectrum with increasing damping ratio (5%, 10%, 20%, 30% and 40%). The results of PGA, PGV and PGD for each area were obtained using 5% critical damping ratio and plotted on tri-linear diagram.
