Quakes to have better locations


  • Brian Kennett


New travel time tables to locate earthquakes are being developed under the Subcommission on Earthquake Algorithms of the International Association of Seismology and the Physics of the Earth's Interior (IASPEI).

The standard travel time tables used by seismological agencies such as the National Earthquake Information Center in Golden, Colo., and the International Seismological Centre (ISC) in Newbury, U.K., are the Jeffreys and Bullen tables published in 1940. These tables were developed 1930–1939 based on available observations, when station time keeping was frequently not reliable. Although the limitations of these tables have been recognized, no other tables provide such a complete representation of P, S and core phases.