Seismogenic Zones and their Influence on Seismic Hazard Assessments – Case Studies from the Caucasus

Date: 4/24/2019

Time: 06:00 PM

Room: Grand Ballroom

Seismogenic zones are delineated, based on all available information from tectonics, active faulting, geology, geodesy, and past seismic activity, for use in probabilistic seismic hazard assessments (PSHA). Often the delineation of seismic zones is dependent on availability of information and how the seismic hazard specialist interprets and makes a judgement based on the available information.

As these decisions may have a significant impact on the estimation of seismic hazard in a region, we explore the sensitivity of hazard results to the delineation of seismic source zones. We first examine the impact of using a single seismogenic zone model versus using multiple zone models in seismic hazard assessments. We then investigate how altering the source zone boundaries impact the earthquake recurrence characteristics of each zone. Of particular interest are the moderate to large earthquakes or occurrence of large number of small earthquakes near source zone boundaries, and assessment of accurate magnitudes and locations.

Presenting Author: Tuna Onur

Authors