By knowing the time difference between when any two types of earthquake waves arrive at any particular place you can deduce how far away the earthquake epicenter is. By contacting other seismographic stations it is possible to determine where the earthquake occurred.
In this activity you will use seismographic data and a compass to find the epicenter of an earthquake. P-wave arrival S-wave arrival. Locate an Earthquake Epicenter. This material is also available as a free iBooks textbook and iTunes U course. Search-Icon Created with Sketch.
KQED is a proud member of. Always free. Sign In. KQED Inform. A circle with a radius of the distance to the quake can be drawn. The earthquake occurred somewhere along that circle. Triangulation is required to determine exactly where it happened. Three seismographs are needed. A circle is drawn from each of the three different seismograph locations, where the radius of each circle is equal to the distance from that station to the epicenter.
The spot where those three circles intersect is the epicenter Figure
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