Chapter 12 Invesigation Worksheet page4 Table 3. Locating the Epicenter of the E

Question

Chapter 12 Invesigation Worksheet page4 Table 3. Locating the Epicenter of the Earthquake (Optional) If your instructor asks you to, use the graph of distance versus P-S time interval (on Table 1) to more precisely determine the of the epicenter of the earthquake. To determine how far the earthquake was from each seismic station, use the P. time intel seismic station and read off the corresponding distance from the P-S time-interval graph. Then, approximately scale off the appropriate distance from the earthquake to the seismic station and sketch part of acircle with this radius a these smic The three circles intersect at the epicenter (the place on the surface directly above the earthquake). The circles may not all ict at a single point, but may only come close to doing so. The triangles on the figure below represent the location of seismic staticns Red Meses Oceanic Crust on Coral Reef Ashton

Explanation / Answer

In order to.determine the location of an epicentre, travel times of P and S waves at three stations are necessary. Data from one station gives the distance of the epicentre from the station, which could lie anywhere on the circle centeredat the station. The data from the second section gives a circle which intersects the first circle at two points, one of which must be the true epicentre. The data from the third circle removes the ambiguity, the commonpoint of the three circles being the epicentre.

Generally the circles do not intersect at a point , but form a small spherical triangle. The optimum location of the epicenter is at the center of the traingle.

The table/ graph is not provided, so I cannot provide further details.

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