ISC-GEM: Global Instrumental Earthquake Catalogue (1900e2009): I. Location and seismicity patterns

The number of associated phases (blue) and the number of defining phases (those that used in the location; red) increase exponentially with time in the ISC-GEM bulletin. S53A-2473 Objectives One of the global components of the Global Earthquake Model Foundation (GEM) effort is to compile a Reference Global Instrumental Seismic Catalogue (1900-2009) to be used by GEM for the characterization of the spatial distribution of seismicity, the magnitude-frequency relation and the maximum magnitude. • Collect and digitize arrival and amplitude data from various data sources for the period 1900-1970; • Relocate instrumentally recorded moderate to large earthquakes spanning 110 years of seismicity; • Calculate body and surface wave magnitudes from original amplitude-period observations; • Provide direct/indirect Mw estimates based on either seismic moment measurements, or empirical Ms-Mw or mb-Mw relations; • Provide uncertainties for each estimated parameter. Data used for relocation Event selection • 1900-1917: Ms ≥ 7.5 and some smaller shallow events in stable continental areas