TauP is a seismic travel time calculator. In addition, it can calculate derivative information such as ray paths through the earth, as well as pierce and turning points. It handles many types of velocity models and can calculate times for virtually any seismic phase with a phase parser. TauP is available for download, or it can be accessed programmatically via SOAP API.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.