Lect. - 8/ 07/2120)3), - Nptel

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.ProbtewN Lect. - 8 / 07/2120)3),

The arrival times of P and S waves in different seismographs located at different sites for an earthquake are listed below.

Seismograph P-wave arrival time S-wave arrival time

Latitude Longitude

37°22'30" 121 °52'30" 05:35:19.84 05:35:27.81 370

45'00" 122°20'00" 05:35:15.78 05:35:19.80 37°52'33" 121 °43'38" 05:35:18.35 05:35:25.00 It is given that one degree change of latitude and longitude corresponds to 111.00 km and 88.20 km respectively at latitude 37 °45'00". Using 3-circle method, estimate the epincentral location (latitude and longitude) of the above earthquake.

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