Question

a) List four steps employed in Deterministic Seismic Hazard Analysis (DSHA) method

b) How is Probabilistic Seismic Hazard Analysis (PSHA) different from Deterministic Seismic Hazard Analysis (DSHA)

Answer 1

a) The four steps employed in DSHA method are

step-1: Identification of seisimic sources

step-2: Determining the shortest distance for the source

step-3: PGA from attenuation relation for each source (PGA= peak ground acceleration)

step-4: PGA for controlling earthquake.

b) Deterministic Seismic Hazard Analysis (DSHA) : It is the quantification of single or relatively small number of individual earthquake scenarios

  Probabilistic Seismic Hazard Analysis (PSHA): It is the quantification of the probability that a specified level of ground motion will be exceeded once at a site or in a region during the specified exposure time.

In other words

In DSHA the hazard will be defined as the ground motion at the site resulting from the controlling earthquake and where as in PSHA the hazard is defined as the mean rate of exceedance of the some chosen ground motion amplitude