Reference Work Entry

Encyclopedia of Complexity and Systems Science

pp 2449-2473

Earthquake Location , Direct, Global-Search Methods

  • Anthony LomaxAffiliated withALomax Scientific
  • , Alberto MicheliniAffiliated withIstituto Nazionale di Geofisica e Vulcanologia
  • , Andrew CurtisAffiliated withECOSSE (Edinburgh Collaborative of Subsurface Science and Engineering), Grant Institute of GeoSciences, The University of Edinburgh

Definition of the Subject

An earthquake location specifies the place and time of occurrence of energy release from a seismic event. A location together witha measure of size forms a concise description of the most important characteristics of an earthquake. The location may refer to the earthquake'sepicenter, hypocenter, or centroid, or to another observed or calculated property of the earthquake that can be spatially and temporallylocalized. A location is called absolute if it is determined or specified within a fixed, geographiccoordinate system and a fixed time base (e. g., Coordinated Universal Time, UTC); a location is called relative if it is determined or specified with respect to another spatio‐temporal object (e. g., an earthquake orexplosion) which may have unknown or uncertain absolute location.

For rapid hazard assessment and emergency response, an earthquake location provides information such as the locality of potential ...

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