Development of the global seismic travel time database at JAMSTEC/IFREE

Abstract

We have constructed a data base of seismic travel times, which should be used to improve our seismic tomography model. We measured absolute arrival times of several seismic phases such as P, PcP, S etc using hand-picking method and PP-P, S-P differential travel times and relative P travel times between different two stations using cross correlation techniques. We use both of broadband and short period waveform data collected from all over the world including ocean bottom seismometers. At present, we have measured totally about 150,000 of various types of travel times.