When one hears that an earthquake has occurred, one of the first questions is, “Where was it?” For the general public, this question often determines the importance of another question, “How big was it?” Upon learning the location and size, one may wonder how this information was determined. For those interested in how earthquakes are located, we have developed an interactive, three-dimensional analog computer that uses a map, strings, and a time-distance scale to find the location of an earthquake (latitude, longitude, and depth) based on seismic wave arrival times. We also have developed a set of lesson plans to...

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