(if calculations are required) for full credit. The following lines are part of
ID: 284532 • Letter: #
Question
(if calculations are required) for full credit. The following lines are part of a seismic catalog. Each line represents an earthquake. The columns are: origin date; origin time (hour:minute:second); event latitude; event longitude; focal depth in km; body-wave magnitude. Use these data for questions 1-6 For a recording station located at exactly the North Pole of the Earth, what are the epicentral distances for each of the earthquakes? Give your answer in both degree and km (use the approximate relationship of 1degree = 111.32 km).Explanation / Answer
Energy released in an earhquake logE = 4.8+1.5M
where M = magnitude
1. In the first earth qauqke M = 8.6
logE = 4.8+1.5*8.6
= 17.7
E = 1017.7 = 50118723362721500 = 5.011*10 17 Joules
2. M = 2.10
logE = 4.8+1.5*2.10 = 7.95
E = 107.5 = 31622776.60168379 = 3.162* 107 joules
3. M = 4.8
E = 1012 Joules
4. M = 3.0
E = 109.3 = 1995262314.9688828 =1.99*109 joules
5.M = 2.0
E = 107.8= 63095734.448019296 = 6.3*107 Joules
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