TUTFEE1BE11 2011

Tribhuvan University Institute of Engineering, Pulchowk Campus

Department of Civil Engineering Bachelor of Civil Engineering IV/B: 2011

Fundamentals of Earthquake Engineering (Elective)

TUTORIAL # 1____________________________________________________________

1. Assuming p- and s- waves traveled through the crust at 6 km/sec and 3 km/sec, respectively, estimate the epicentral location (latitude and longitude) of the hypothetical earthquake whose characteristics are given below:

Seismograph

Latitude Longitude p- wave arrival time s- wave arrival time

37022’30” 121052’30” 06:11:18.93 06:11:26.90

37045’00” 122020’00” 06:11:14.84 06:11:18.71

37052’33” 121043’38” 06:11:17.26 06:11:23.53

2. The following figure shows the displacement of rock strata caused by the Carmel Valley Fault, located at Torry Pines, California. Based on the displacement of the hanging wall as compared to the footwall, what type of fault is shown in the figure?

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TUTFEE1BE11 2011

3. Assume that the displacement data shown in the following figure represents the trace data from a standard Wood-Anderson seismograph and that the instrument is exactly 100 km from the epicenter. Based on these assumptions, determine the Richter magnitude.

Acceleration, velocity, and displacement versus time recorded during the San Fernando earthquake.

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TUTFEE1BE11 2011

4. A seismograph, located 1200 km from the epicenter of an earthquake, records a maximum ground displacement of 15.6 mm for surface waves having a period of 20 seconds. Based on these assumptions, determine the surface wave magnitude.

5. Assume that during a major earthquake, the depth of fault rupture is estimated to be 15 km, the length of surface faulting is determined to be 600 km, and the average slip along the fault is 2.5 m. Based on these assumptions, determine the moment magnitude. Use a shear modulus equal to 3 x 1010 N/m2.

6. An earthquake causes an average of 2.6 m strike-slip displacement over a 75 km long, 22 km deep portion of a transformed fault. Assuming the average rupture strength along the fault as 180 kPa, estimate the seismic moment and moment magnitude of the earthquake.

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