Bayesian estimation of strong earthquakes in the Inner Messiniakos fault zone, southern Greece, based on seismological and geological data

Statistical estimates of earthquake magnitudes are unreliable when based on very few historical data. Additional sources of information, such as geolo gical data, are then necessary to update estimates of seismicity parameters . The Bayesian probability theory is a tool to combine prior information of seismicity obtained from geological data with historical observations. Thi s theory is tested in the case of the Inner Messiniakos fault zone, souther n Greece, for the estimation of the probability of occurrence of strong ear thquakes. Prior estimates of seismicity are developed from slip rate measur ements, obtained from offsets of geological formations, on the basis of bot h onshore and offshore neotectonic data. The analysis emphasizes the import ance of the input seismicity parameters, particularly the significance of t he upper bound magnitude in the estimation of the seismic potential of acti ve faults.