A pendulum that has a period of 3.00000 s and that is located where the acceleration due to gravity is 9.79ms-2 is moved to a new location where the acceleration due to gravity is 9.82ms-2 . a) What is the new period? b) At what frequency does it swing?
3. A pendulum that has a period of 3.00000 s and that is located where the acceleration due to
gravity is 9.79ms-2
is moved to a new location where the acceleration due to gravity is
9.82ms-2
.
a) What is the new period?
b) At what frequency does it swing?
4. At a recording station, a difference in time of arrival between p waves and s waves was
observed to be 1.5 seconds. What is the approximate distance from the station at which the
event occurred? Assume p wave velocity as 7.97 km/s and s wave velocity as 4.55 km/s.
5. Calculate the arrival times of p-waves and s-waves if distance between the epicentre and the
recording station is 3.5 km.
6. You glance at the clock when you hear the first rumbling of the earthquake. You feel the
strong shaking exactly 13 seconds later. Estimate the likely distance of the quake from you.
7. Estimate the moment magnitude of an event with rupture length of 100 km, rupture width
of 45 km and average fault slip of 3 m.
8. On 27 Feb. 2010, a huge earthquake occurred near Bio-Bio, Chile. The fault rupture
exceeded 100 km in width and extended nearly 500 km parallel to the coast. The rupture
began approximately 25 km beneath the coast and spread westward, northward and
southward. As the rupture spread, the fault slip of 15 m generated earthquake shaking and
triggered a tsunami along the fault-rupture area. Calculate the moment magnitude of the
earthquake.
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