Abstract
Deterministic seismic hazard assessment developed in 1960s is the oldest method of analysis of seismic ground response. This paper describes the application of seismic hazard assessment to obtain the Peak Ground Acceleration at major cities in Sri Lanka due to an oceanic earthquake. Two earthquakes, occurred in 2011 and 2012 in the above region, were chosen for the validation of suitable attenuation relationships for the region. The comparison shows that, out of the two attenuation relationships investigated, Gitterman et al. (1993) relationship gives the bestprediction.
Highlights
IntroductionEarthquakes are created by the energy release due to relative movement either between the plates (interplate) or at the weak planes on the plate (intraplate)
Earthquakes are created by the energy release due to relative movement either between the plates or at the weak planes on the plate
This paper describes a study performed to determine seismic hazard assessment of Sri Lanka using the Deterministic Seismic Hazard Assessment (DSHA) technique
Summary
Earthquakes are created by the energy release due to relative movement either between the plates (interplate) or at the weak planes on the plate (intraplate). The energy released by an earthquake creates elastic body waves at the focus which propagates uniformly radially outwards along the medium (rock) subjected to dispersion and attenuation with travel. These seismic waves are called P (Compression) or S (Shear) waves depending on their motion characteristics. Deterministic Seismic Hazard Analysis (DSHA) was one of the popular approaches in early years of geotechnical earthquake engineering In this approach, a seismic scenario is developed on the basis of ground motion hazard evaluation. Indicate the threat to the site are obtained by one or more attenuation relationships Attenuation relationships are those given in the literature based on models developed and calibrated using past earthquake and attenuation data taken from earthquakes in different parts of the world. The selected relationships should be verified using actual data from the site
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