. Earthquakes and other earth movements . Fig. 9. The question is to determine where the horizontal component c A of these normal motions is a maximum. First observe that the triangle 0 c c is similar to a, b, c. Also r = -T -^, and therefore the normal component sm 6 c, 61 at Cj is equal to C â^â, Also Cj a, = Cj 6,, cos 0. c, a = c sin 6 cos 6 h c sin 20 h 2 and sin 2^ is greatest when 2(9 = 90° or ^ = 45°. That is to say, the horizontal component reaches a maximum where the angle of emergence equals 45°. This question has been discussed on the assumption that the amplitude of an earth pa
. Earthquakes and other earth movements . Fig. 9. The question is to determine where the horizontal component c A of these normal motions is a maximum. First observe that the triangle 0 c c is similar to a, b, c. Also r = -T -^, and therefore the normal component sm 6 c, 61 at Cj is equal to C â^â, Also Cj a, = Cj 6,, cos 0. c, a = c sin 6 cos 6 h c sin 20 h 2 and sin 2^ is greatest when 2(9 = 90° or ^ = 45°. That is to say, the horizontal component reaches a maximum where the angle of emergence equals 45°. This question has been discussed on the assumption that the amplitude of an earth particle varies inversely as its distance from the origin of the shock. Should we, however, assume that this amplitude varies inversely as the square of the distance from the origin, we are led to the result that the area of greatest disturbance is nearer to the point where the angle of emergence is 56° 44' 9".
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