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International Seismological Centre: Providing Data Sets for Scientific Research István Bondár ESC 32nd General Assembly Montpellier, September 6-10, 2010
Outline • International Seismological Centre • ISC bulletin • EHB • IASPEI Reference Event List • International Seismographic Station Registry • Future products
ISC • International Seismological Centre • A non-profit, non-governmental entity • Supported by NSF, Royal Society and 55 other institutions worldwide • International Seismological Summaries (ISS), predecessor of the ISC (1903-1963) • Mission • Produce the definitive bulletin of the seismicity of the Earth • Maintain the International Seismographic Station Registry (in cooperation with NEIC) • Host and maintain high-quality data sets openly accessible to the scientific community
ISC bulletin • ISC bulletin (1960-2010) • ~3.5 million reported events, ~1 million ISC solutions • ~85 million phases, ~27 million amplitudes • ISC bulletin review is 24 months behind real time • Since 1999 all reported events are entered into the ISC DB Number of events reported/reviewed Number of associated phases
Comprehensive ISC Bulletin Events reported to the ISC
ISC Bulletin Events relocated by the ISC
EHB • Groomed ISC bulletin provided by Bob Engdahl • Selected ISC events relocated by the EHB location algorithm • More accurate depth and location • Extensively used in seismic tomography studies • Event selection criteria • 10 or more observations at teleseismic distances (> 28º) • teleseismic secondary azimuthal gap < 180º • EHB bulletin • Updated annually • 1960-2007 • ~140,000 events • ~22 million phases
Ground Truth Database • IASPEI Reference Event List of GT0-5 events • ~7,300 events • ~500,000 phases • GT5 events satisfy Bondár and McLaughlin (2009) selection criteria • Used to validate • 3D Earth models • Travel-time corrections • New location algorithms • Updated regularly • Recently added • GT0 Bouncefield (UK) explosion, 2005/12/11
International Station Registry • Jointly maintained by the ISC and NEIC • More than 15,000 stations, both active and closed • Includes USArray stations • Updated regularly • IberArray stations will be soon registered • The CTBTO is encouraged to register IMS stations
Future Products • Global Earthquake Risk Model (GEM) • The ISC is leading a consortium to produce a 100-year instrumental catalogue of large earthquakes • Participants: • Willie Lee, Bob Engdahl, Antonio Villaseñor, Peter Bormann, SISMOS, ISC and IASPEI (as advisor) • Phase and amplitude readings are being entered to the ISC database from historical bulletins and station reports • Events will be relocated with the EHB algorithm • Magnitudes will be calculated according to IASPEI standards • MS_20/MS_BB, mB/mB_BB and an Mw proxy • The GEM instrumental catalogue and bulletin will be published at the ISC website