ISC Bulletin: interactive arrivals search
From data year 2021 ISF 1 will not be able to show arrival data that has a network code, please use ISF 2.1
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.
Search arrivals associated to events in the ISC Bulletin at specific stations. Search for:- arrival-times
- travel-time residuals (available for ISC reviewed events)
- time-defining phases (available for events with ISC hypocentres)
- amplitudes
To complete a search without the interactive interface, a standard search page is available:
About the event arrivals search
Use this page to search for arrivals/phase data within the ISC bulletin. Data can be returned both for specific stations and for specific events. Returned data for individual arrivals at each station includes arrival times, travel-time residuals, a flag for time-defining phases, amplitudes, and the prime hypocentre for each event.Database
- Reviewed ISC Bulletin:
- 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.
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 arrivals:
- ISF (1 or 2.1) associated arrivals:
- QuakeML:
A fixed format, comma separated output, with one line per arrival. For a full explanation of each field, see the csv arrivals output page .
The IASPEI Seismic Format (ISF) is a fixed format bulletin. Further information about the different versions of the format and links to the full documentation can be found on the ISF page.
QuakeML is an XML representation of seismological data. Data are output as an XML stream using the QuakeML XML Schema, version 1.2. Similar to the CSV output, only the prime origin are output for each event. 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 arrivals
- Arrival-time data:
- Travel-time residuals:
- Time-defining phases:
- Amplitude data:
- Phase name:
If ticked, only arrivals with arrival-time data will be returned (some amplitudes do not have an arrival-time).
If ticked, only arrivals with ISC determined travel-time residuals will be returned. Travel-time residuals are only computed for events within the Reviewed ISC Bulletin. Before 1st January 2006, travel-time residuals were computed with from the JB Earth model. Since 1st January 2006, travel-time residuals are computed from the ak135 Earth model.
If ticked, only arrivals which are time-defining will be returned. Time-defining phases are those phases which are used in the computation of the prime hypocentre. Defining phases only exist for events with an ISC authored hypocentre.
If ticked, only arrivals with amplitudes will be returned.
By specifying a specific phase name (or list of phases), only arrivals from those phases will be returned (E.g. P, Pg, PKPdf, S, etc. ). The standard nomenclature for seismic phases approved by IASPEI is detailed in Storchak et al. (2003) and are listed here.
Search STATIONS
To specify stations to search for arrivals, you may either provide a station code (or a list of station codes in a comma separated list), or you may define a search region (rectangular, circular, global, Flinn-Engdahl region), which will search stations from the International Registry of Seismograph stations.
Search region for EVENTS
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.
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 and 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 to 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). For more information on any of these agencies, please visit the contributing agencies page.
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.
