4. (10 pts) From the following velocity seismograms, label all seismic phases. U

Question

4. (10 pts) From the following velocity seismograms, label all seismic phases. Use the travel times listed below to help you out. Is this a deep (300-660km) earthquake? If so, how do you know? Clearly state your reason for your answer. -2 48. 10 12 16 X 10+2 delta # code time(s) (mins) dT/dD dT/dh d2T/dD2 70.00 1 P 610.90 10 10.90 5.9044 -8.01E-02 -4.35E-03 2 PcP 627.94 10 27.94 4.2631 -8.98E-02 1.94E-02 3 pP 735.05 12 15.05 6.4235 7.60E-02 -3.92E-03 4 PP 777.02 12 57.02 8.4338 -5.30E-02 -1.01E-02 5 sP 799.35 13 19.35 6.2778 1.70E-01-4.09E-03 6 PKiKP 974.91 16 14.91 1.4132 -9.84E-02 1.94E-02 7 S 1113.76 18 33.76 11.3058 -1.42E-01 -2.71E-03 8 pPKiKP 1118.06 18 38.06 1.3916 9.84E-02 1.94E-02 9 SKiKP 1130.24 18 50.24 1.4650-1.81E-01 1.94E-02 10 SPn 1145.14 19 5.14 13.0369 -1.27E-01 -3.88E-03 11 SKSac 1152.24 19 12.24 7.4701 -1.65E-01 -9.46E-03 12 SKKSac 1152.50 19 12.50 7.5673 -1.65E-01 -6.44E-02 13 Scs 1154.36 19 1436 7.9527 -1.63E-01 9.71E-03 14 sPKiKP 1177.40 19 37.40 1.3965 1.81E-01 1.94E-02 15 pSKSac 1331.91 22 11.91 7.5836 6.45E-02-6.76E-02 16 sS 1336.10 22 16.10 12.1841 1.35E-01 -2.51E-03 17 sSKSac 1399.01 23 19.01 7.5614 1.65E-01 -2.48E-02 18 SS 1401.28 23 21.28 15.1416 -1.01E-01 -7.50E-03

Explanation / Answer

Yes, it is a deep earthquake. According the seismological chart and the concept it is classified as earthquake with low range upto 70 are fall in the lower range of earthquake. From 70 to 300 ii is fall under the medium or intermediate range and the earthquake fall in the range of 300- 600 km are of deep order. It can be simply defined by the above given graph. In this it Is clearly shows that it have high pick in this.

More over it is already classified in this ranges according to their Magnitude. So it is a deep earthquake.

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