ISC Bulletin: interactive event catalogue search

Please do not search via isc-mirror.iris.washington.edu as it will be turned off in 2024, please use www.isc.ac.uk

The ISC Bulletin has now been completely rebuilt for the period 1964-2010. As a result, the ISC hypocentre solutions and magnitudes for the entire period of 1964-latest are based on the ak135 velocity model and the location procedure that is currently used in operations. The Bulletin has been cleaned up and a considerable number of previously unavailable data of permanent and temporary seismic deployments have been added.

To complete a search without the interactive interface, use the standard event catalogue page:

ISC Bulletin: event catalogue search

This page is used to search the ISC Bulletin to output a simple catalogue of events, using only the preferred (prime) hypocentre for each event.

By default all magnitudes for an event are output. Optionally the search (and output) may be limited by magnitudes computed by a specific author (e.g. ISC, GCMT, NEIC, etc) or by magnitudes associated to the prime hypocentre.















Lat: Lon:


Plot saved polygon:



Select database:
Reviewed ISC Bulletin ISC Bulletin

Output format:
CSV formatted catalogue QuakeML (XML stream)
Select time period:

Start date: Time (HH:MM:SS):
End date: Time (HH:MM:SS):


Additional search parameters:

Min depth (km): Max depth (km): Include events with unknown depths:
Min magnitude: Max magnitude: Include events with unknown magnitudes:
Magnitude type
(use CTRL for multiple types): 		Magnitude author: (E.g. ISC, NEIC, GCMT/HRVD, JMA)


Output options:

Output links in the output.



About the catalogue search

Use this search to produce a list of events showing the prime (preferred) hypocentre for each event and any selected magnitude values. By default all magnitudes for each event are output.

Database

  • Reviewed ISC Bulletin:

    • A subset of the ISC Bulletin that has been manually reviewed by ISC analysts. This includes all events that have been relocated by the ISC. For more information on the Reviewed ISC Bulletin, see here.

  • ISC Bulletin:

    • The entire ISC Bulletin from both reviewed and unreviewed events. This includes the most recent events, which have yet to be reviewed.

Output format

  • CSV formatted catalogue:

    • A fixed format, comma separated output, with one line per event. The number of fields will vary depending on the number of magnitudes that match the search criteria. For a full explanation of each field, see the csv catalogue output page.

  • QuakeML:

    • The results are output as an XML stream using the QuakeML XML Schema, version 1.2. This output is not designed for use in a browser and will cause browsers to crash for large queries. For a complete explanation of the schema, please view the documentation on the QuakeML site.

Search region

There are four possible methods for defining a search region (rectangular, circular, global, Flinn-Engdahl region). Leaving fields blank, will automatically default to a global search. To interactively define a search region, using customised shapes, please use the interactive search page. The defined region is used to check only the prime hypocentre - secondary hypocentres within a search region will not influence the results.

Time period

This is the start and end date to search for events. Only the prime hypocentre will be searched to match events - i.e. origin times for secondary hypocentres will not influence the results.

Unknown depths

As some events have no determined depth, you may optionally choose to include events with unknown depths in the search. This will return events which match any selected depth constraint you enter as well as events with no depth.

Unknown magnitudes

As some events have no determined magnitude, you may optionally choose to include events with unknown magnitude values in the search. This will return events which match any selected magnitude constraint you enter as well as events with no magnitude value.

Magnitude type

Limit events by magnitude for specific magnitude types. Due to the large number of magnitude types and the various notation used, the selected type will search all magnitudes of that type. E.g. MB will match all body-wave magnitudes: mb, mB, MB, mb1mx, etc.

Magnitude author

Limit events by magnitude values determined by a specific author. ISC, NEIC, GCMT/HRVD, JMA, amongst others are considered reliable magnitude authors. The default uses 'Any', which will match any author that has a magnitude for both prime and secondary hypocentres included in an event. Selecting 'prime author' will limit the search by magnitudes directly associated with the prime hypocentre (usually the same author as the prime hypocentre) - i.e. for events with an ISC authored prime hypocentre, selecting 'Prime author', will limit events to those with ISC determined magnitudes (and any min/max value specified).

E.g. To search for events with MW >= 6, you may want to specify the magnitude author to be GCMT as there may be few events where the 'prime author' has computed a moment magnitude.

Please note: selecting either GCMT or HRVD, will return results from both agencies, as GCMT is a continuation of HRVD.

Output links

This provides links for each event to the full Bulletin listing. There are also links for each author to provide the full agency details.