We have constructed a data base of seismic traveltimes, which was used to improve our seismic tomography model. We measured absolute arrival times of several seismic phases such as P, PcP, S etc by manual picking and differential travel times between PP and P and differential travel times of P-wave between two stations using waveform cross-correlation method. 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 80,000 of various types of traveltimes.
※ If you use the data from this site, please refer to the source of the data and the references (see below).



・Yoshimitsu, J. and M. Obayashi (2017), A database of global seismic travel times, JAMSTEC Rep. Res. Dev., Volume 24, (in press)
・Yoshimitsu, J., Obayashi, M., Fukao, Y. (2009), Development of the global seismic travel time database at JAMSTEC/IFREE, JAMSTEC Rep. Res. Dev., Special Issue, 163-172 (in Japanese)

Data citation

Volcanoes and Earth's Interior Research Center, Research Institute for Marine Geodynamics/JAMSTEC (2016) Global Seismic Traveltime Database. JAMSTEC. doi:10.17596/0000107

Last updated 2019-05-28

Absolute Arrival time

Download / Data Format

Differential Traveltime
of P-wave between two stations

Download / Data Format

Differential Traveltime
between PP and P (PP-P)

Download / Data Format

Data Policy

Global P wave  Tomography model
Geophysical observation network in Western Pacific
Seismic imaging of the Earth's cross-sections