Site Effects of Soft Soil Deposit on Ground Motion in Kathmandu Valley
Abstract— As valley have faced major seismic shock of major three earthquakes 1934, 1988 and 2015 A.D. and have proved that the valley has been suffering from site effects as it is rich in equestrian soil. The recent earthquake has massive destruction in Gongabu, Balaju area where it has mercy in Balkumari area. Among major populated area of valley Balajuand Gongabu have gray loose silty sand and black cotton soil up to 10-15 m which are a major cause for amplification of earthquake waves and for a Balkumari there is stiff clay soil and rock is in lower depth and it has been proved by 1-D analysis by using DEEPSOIL software. Response spectra, peak ground acceleration and column -displacement animation analysis for equivalent mode were established. This paper mainly highlights the effects of surface and lower layers of soil in the planning and designing of infrastructures in the Kathmandu Valley
Keywords—Earthquake, Gray loose soil, Site Effect,Kathmandu valley, Deep soil, Planning and Designing
