3:30 PM - 4:30 PM
[S01-P-08] The current status of the ISC Bulletin
The International Seismological Centre (ISC) is a non-governmental, non-profit-making organization funded by 69 research and operational institutions in 45 countries around the world and several sponsors from the public and commercial sectors. The ISC's primary role is the production of the Bulletin – the definitive summary of global seismicity from 1904 till present, based on reports from over 130 seismic networks worldwide.
The historical part of the Bulletin (pre-1964) now contains seismic arrival times at stations from the International Seismological Summaries (ISS) and from individual station bulletins digitized as part of the ISC-GEM project. The modern part (post-1964) is currently being re-worked under the Bulletin Rebuild project: we re-compute ISC hypocentres using the ISC location algorithm and the ak135 velocity model, and re-assess ISC-reported magnitudes making them more robust and reliable. We also collect and integrate previously missing bulletins from permanent and temporary seismic networks, filling the gaps in time and space.
Hours to days after seismic event occurrence, the ISC Bulletin contains integrated preliminary reports from networks that are substituted with final reports within 12-24 months. After review by ISC analysts, preliminary data in the Bulletin are substituted with Reviewed, presently after ~36 months. With the introduction of the new Visual Bulletin Analysis System, the time required for analyst review is set to reduce.
ISC data are distributed via the ISC and several mirror websites, e.g., those at IRIS DMC, University of Tokyo, LLNL, China Earthquake Administration, CTBTO, and are available on a series of DVD-ROMs. We also issue the printed Summary of the ISC Bulletin that gives information on the ISC, procedures and data formats, analysis of incoming data and the data in the ISC Bulletin; as well as invited publications on notable seismic events and history, and the status of individual seismic networks and their procedures.
The historical part of the Bulletin (pre-1964) now contains seismic arrival times at stations from the International Seismological Summaries (ISS) and from individual station bulletins digitized as part of the ISC-GEM project. The modern part (post-1964) is currently being re-worked under the Bulletin Rebuild project: we re-compute ISC hypocentres using the ISC location algorithm and the ak135 velocity model, and re-assess ISC-reported magnitudes making them more robust and reliable. We also collect and integrate previously missing bulletins from permanent and temporary seismic networks, filling the gaps in time and space.
Hours to days after seismic event occurrence, the ISC Bulletin contains integrated preliminary reports from networks that are substituted with final reports within 12-24 months. After review by ISC analysts, preliminary data in the Bulletin are substituted with Reviewed, presently after ~36 months. With the introduction of the new Visual Bulletin Analysis System, the time required for analyst review is set to reduce.
ISC data are distributed via the ISC and several mirror websites, e.g., those at IRIS DMC, University of Tokyo, LLNL, China Earthquake Administration, CTBTO, and are available on a series of DVD-ROMs. We also issue the printed Summary of the ISC Bulletin that gives information on the ISC, procedures and data formats, analysis of incoming data and the data in the ISC Bulletin; as well as invited publications on notable seismic events and history, and the status of individual seismic networks and their procedures.