CSV arrivals output

The CSV output for the arrivals search is a one line per arrival output. Click here to load an example.

Each line has 26 fields, which are preformatted and comma separated. Each field is in one of 4 groups:

EVENT, ARRIVAL DATA, ORIGIN DATA, EVENT MAGNITUDE


Group Title Position Description
EVENTEVENTID1-9Unique id number specific to each ISC event.
ARRIVAL DATAREPORTER11-19Name of the agency that reported the arrival data.
ARRIVAL DATASTA21-25Station name where the arrival was recorded.
ARRIVAL DATALAT27-34Latitude of station.
ARRIVAL DATALON36-44Longitude of station.
ARRIVAL DATAELEV46-42Elevation of station (m).
ARRIVAL DATACHN44-46Channel the arrival was recorded on (e.g. SHZ, BHZ, BHE, etc.).
ARRIVAL DATADIST48-51Epicentral distance (degrees) from the station to the epicentre of the prime origin.
ARRIVAL DATABAZ53-57Back-azimuth - azimuth from the station to the epicentre of the prime origin.
ARRIVAL DATAISCPHASE59-66Phase name of the arrival determined by the ISC.
ARRIVAL DATAREPPHASE68-75The phase name of the arrival as was reported by reporter.
ARRIVAL DATADATE77-86Date of the arrival.
ARRIVAL DATATIME88-98Time of the arrival.
ARRIVAL DATARES100-104Travel-time residual for ISCPHASE. This is currently computed using the ak135 velocity model. Prior to January 2006, the JB velocity model was used.
ARRIVAL DATATDEF106-109Time-defining flag. Set to true if the arrival-time was used in the computation of the prime hypocentre. This is generally only known for ISC computed hypocentres.
ARRIVAL DATAAMPLITUDE111-119Amplitude measurement (nm).
ARRIVAL DATAPER121-125Period (s) used in the amplitude measurement.
ORIGIN DATAAUTHOR127-135Author of the prime hypocentre.
ORIGIN DATADATE137-146Date of the prime hypocentre.
ORIGIN DATATIME148-158Time of the prime hypocentre.
ORIGIN DATALAT160-167Latitude of the prime hypocentre.
ORIGIN DATALON169-177Longitude of the prime hypocentre.
ORIGIN DATADEPTH179-183Depth (km) of the prime hypocentre.
EVENT MAGNITUDEAUTHOR185-193Author of the selected magnitude.
EVENT MAGNITUDETYPE195-200Magnitude type (e.g. Mw, MS, mb, ml, etc. ) of the selected event magnitude.
EVENT MAGNITUDEMAG202-205Magnitude value of the selected event magnitude.

Notes on the event magnitude

As there are potentially many magnitudes for each event, to reduce the size of the output, only a single magnitude is returned per event for the arrival search. To determine the magnitude that is selected, the following logic is used:

  • Only use the magnitude that fulfills the search requirements (e.g. magnitude range, magnitude type, magnitude author).
    • If no author is specified, choose a magnitude associated to the prime hypocentre.
    • If there is more than one magnitude associated to the prime hypocentre, preferentially choose Mw, mb, ms, ml, respectively.
    • Preferentially choose the largest value if any choice remains.
      • If no author is specified and there is no magnitude associated to the prime hypocentre, preferentially choose magnitudes by GCMT/HRVD, NEIC, NIED, JMA, IDC (mb only).
      • If there is more than one magnitude associated to the preferred author, preferentially choose Mw, mb, ms, ml, respectively.
      • Preferentially choose the largest value if any choice remains.
        • If no author is specified and there is no magnitude associated with the prime hypocentre, and there is no magnitude by one of the preferred magnitude authors, preferentially choose Mw, mb, ms, ml, respectively.
        • Choose the largest value if any choice remains.