Locate the Epicenter of an Earthquake Activity 16.3 8.06 Figure A16.3. 808 8 10

Question

Locate the Epicenter of an Earthquake Activity 16.3 8.06 Figure A16.3. 808 8 10 8:12 816 Tmes A Using the scismograms in Fig. A18.3.1, esimate to the nearest tenth of a minude the timses that P-aves and Swanes first arrived at each seismic station (Sika, Charlotte, Honolulu. You might want to renew F g. 164 to help pick out the P-and Swaves. Then suberact P from 5 to get the S-minus-P time intenval First P First 5 arrival Stka, AK Carone, NC Honolulu,H 05:0 113 D Lsing the Steimus-P uime inicervalk determincd in part A and the trane ine cunes in Fig 18.5, determsine the distanice from the epicenter (in kilometers) for each scisenic station Honolulu, HI Charlote, NC:m km 421

Explanation / Answer

We know that the average velocity of the PS waves are in the range of 6.26 km/s.

Now the distance in km from the epicentre is calculated using a very simple formula which is

Distance = speed x time

Therefore for station Sirka, Epicentral distance = 6.26 x (8.115-8.075) = 6.26 x 0.04 = 0.2504 km

Similarly, for Charlotte , Distance = 6.26 x (8.135-8.08) = 0.3443 km

For Honululu, distance = 6.26 x(8.1525- 8.095) = 0.35995km

Note - the time is calculated by the difference in the time between the first arrivals of S and P waves in each stations.

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