The Earthquake Triangulation app provides a simple interactive map where students or instructors can estimate the location of an earthquake using the distances between the earthquake and 3 or more seismic stations. The application allows users to place their choice of seismic stations on the maps and then enter the distances to the earthquake. Distance circles then appear on the map and the user can determine the likely earthquake location. Earthquake-station distances need to be calculated separately by first picking P and S arrival times on seismograms, and then using a P and S wave travel time graph to determine the distance.
We are showing the 1000 latest earthquakes with a magnitude of at least 5.
To plot a different selection of events, visit Interactive Earthquake Browser (IEB). Using IEB’s filters, create the desired view, copy that URL and paste it here under Advanced Options > Paste IEB link here' and press enter or click on the map.
To add a station’s S minus P time distance circle, click on the + Station button in the top right corner.
You can adjust the position and the diameter the station by entering values manually, or by dragging the center of the created circle.