The TauP Toolkit is a seismic travel time calculator. In addition to travel times, it can calculate derivative information such as ray paths through the earth, pierce and turning points. It handles many types of velocity models and can calculate times for virtually any seismic phase with a phase parser. It is written in Java so it should run on any Java enabled platform. Unfortunately, gjc, which comes with many Linux distributions, is not quite Java and prevents TauP from finding its model files. Please use Java from Sun on Linux instead.


We have released the next version of TauP, TauP-2.6.1, which fixes an issue with pierce and path points for head waves like Pn.

Snap for linux

sudo snap install taup


brew tap crotwell/crotwell && brew install taup

Manually with tar file

wget http://www.seis.sc.edu/downloads/TauP/TauP-2.6.1.tgz && tar zxf TauP-2.6.1.tgz

You may download the latest version, 2.6.1, as a tar.gz under the terms of the GNU Lesser General Public License. It was created on 25 July 2022.


The documentation for TauP is available as a PDF document. You can download the zip file or the tar.gz version containing a draft and the source images of our paper submitted to the Seismological Research Letters.

If you would like TauP and would like to cite it, please use the following: Crotwell, H. P., T. J. Owens, and J. Ritsema (1999). The TauP Toolkit: Flexible seismic travel-time and ray-path utilities, Seismological Research Letters 70, 154–160.

If you have any comments, please email us. . You may also join the TauP email list.

The TauP Toolkit source code is hosted on github here: https://github.com/crotwell/TauP.

The TauP Toolkit jar is also available from maven central with group edu.sc.seis and id TauP.

The TauP Toolkit is also used by the IRIS Traveltime web service. It can output the same text and json output as TauP_Time, along with SVG output of TauP_Path, and may be an attactive option for some users. For example, a SVG plot of raypaths could be generated by http://service.iris.edu/irisws/traveltime/1/query?staloc=[35.946,-106.457]&evloc=[-36.122,-72.898]&evdepth=22.9&format=svg.