International Seismological Centre: Providing Data Sets for Scientific Research István Bondár ESC 32 nd General Assembly Montpellier, September 6-10, 2010

2 Outline International Seismological Centre ISC bulletin EHB IASPEI Reference Event List International Seismographic Station Registry Future products

3 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 ( ) 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

4 ISC bulletin ISC bulletin ( ) ~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

5 Comprehensive ISC Bulletin Events reported to the ISC

6 ISC Bulletin Events relocated by the ISC

7 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 (> 28 º ) teleseismic secondary azimuthal gap < 180 º EHB bulletin Updated annually ~140,000 events ~22 million phases

8 EHB

9 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

10 Ground Truth DB

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

12 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