JAVASCRIPT TRAVEL TIME SIMULATOR

A seismogram may appear to be a chaotic record of noise, but amidst the noise there are unidentified earthquake onsets (UEOs). These UEOs are the wave phases before they are identified. Currently, to identify these, one would have to use the Jeffreys-Bullen tables to manually look up and correct the travel time for each of these UEOs to determine which phase they belong to. With the use of JavaScript and HMTL, a website calculator was made to achieve these travel times in a more convenient way. The code uses the spherical law of cosines and bilinear interpolation to complete the task. The only thing necessary of the user, is to input the latitude and longitude of the observation site (seismic station) and the earthquake site, along with the focal depth of the earthquake. The program then outputs the travel times for all the possible wave phases. A once tedious task has now been made simple, allowing geologists to focus on the implications of these travel times for the phases, rather than using valuable time to manually calculate them.