Transcript Dmitry Storchak, Istvan Bondar, Oriol Gaspa & James Harris International Seismological Centre (ISC) United Kingdom www.isc.ac.uk ESC, Crete, Sept 2008 Seismic events in the ISC Bulletin:

Dmitry Storchak, Istvan Bondar,
Oriol Gaspa & James Harris
International Seismological Centre (ISC)
United Kingdom
www.isc.ac.uk
ESC, Crete, Sept 2008
Seismic events in the ISC Bulletin: 1964-2008
The ISC is an international non-governmental non-profit organisation,
charged with production of the Bulletin - the definitive comprehensive
summary of the world seismicity - recently 250’000 events per year.
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The ISC publishes its Seismological Bulletin based on parametric data
on natural & induced seismic events and explosions collected in variety
of different formats from ~120 observatories and data centres around
the world.
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More than 4500 seismic stations worldwide contribute to the ISC Bulletin in recent
years (red). All of them are part of the International Seismic Station Registry (IR).
The IR (grey) is jointly maintained by the ISC and World Data Center B (NEIC).
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For many years the main
strategy of the ISC was
to wait for two years in
order to collect the final
bulletin data and compile
the most complete and
accurate account of the
world seismicity.
The users of the ISC
data always had to
complement the most
recent 2 years with data
from other sources.
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July 2005Aug 2006
An event is counted when the first
hypocentre is reported to ISC
An event is counted when the last
station arrival is reported to ISC
At present it takes 16 months to collect minimum information and 24 months
to collect all information about 95% of all events in the ISC Bulletin.
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
To have the ISC database populated with the most
accurate data available at each point in time

this can be achieved by collecting available alert
messages and provisional automatic bulletins prior to
normal collection of final reviewed data

these provisional data are going to be substituted with
final reviewed data from agencies once those become
available

The ISC is going to provide links to original sources of
information, further increasing a visibility of national
seismic networks
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Provisional info
Final reviewed info
July 2005Aug 2006
We hope to receive the first bulletin
information about many more seismic
events much sooner than now
Stays as is
Normal collection of final reviewed
bulletins is likely to stay as is
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
The ISC is not going to provide a 24x7 service

The ISC is not planning to compute its own solutions
until 18-24 months after real time.

The ISC reviewed bulletin is not going to be based on
alert or automatic data.
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Comparative timeliness of
data collection for the
month of June
2005,2006,2007,2008
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Data reported by Puerto Rico Seismic Network
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
The International Seismological Centre is attempting to
run a comprehensive up-to-date collection (1964-present)
of global seismicity with bulletin data available to users
soon after these data are made available to the ISC

The ISC invites networks in Europe to contribute its fully
or semi-automatic provisional bulletin data to the ISC prior
to normal delivery of final reviewed bulletin products
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The ISC is grateful to

55 Member-institutions contributing funds &

120 Agencies providing seismic bulletin data
towards compilation of the ISC Bulletin – the definitive
summary of global seismicity.
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