IRIS/IDA Seismic Wave Travel Times Data Set

IDA (International Deployment of Accelerometers) is a global network of broadband and very long period seismometers operated by the Institute of Geophysics and Planetary Physics (IGPP), Scripps Institution of Oceanography (SIO), University of California, San Diego (UCSD).

Project

IDA is an element of the IRIS Global Seismographic Network supported by the Cecil and Ida Green Foundation for the Earth Sciences, the National Science Foundation, and the Air Force Office of Scientific Research. There are currently 36 broadband stations deployed worldwide. Data from an earlier network of 15 very long period IDA instruments are also available.

The Principal Investigator of

Project

IDA is Dr. Jonathan Berger (jberger@ucsd.edu), and the Executive Director is Dr. Peter Davis (pdavis@ucsd.edu).

TRAVEL TIMES DATASET: The travel times dataset currently contains first arriving P phases and S phases recorded by the IRIS/IDA network of GSN broadband stations. Included in the dataset are station, channel, phase, DCC phase pick time, associated origin time, standard deviation of the detection time (delta time), latitude, longitude, focal depth, magnitude, and the catalog referenced for association. TRAVEL TIME RESIDUALS: The travel time residual (measured in seconds) is found by taking the observed arrival time of a seismic phase and subtracting the expected arrival time.

The expected arrival time is calculated by a formula based on the iasp91 travel time model, an event location and origin time, the distance to the station, and the particular seismic phase.