For d=20 m, g=9.8, T=5 s, 10 s and 20 s, Calculate the wavelength and wave phase speed (celerity) [Wavelength L=38.88, 121.2, 270.7(m)] [Wave phase speed C=7.78, 12.12, 13.54(m/s)]

11. (a) Calculate the minimum arrival times for seismic reflections from each of the reflecting interfaces in the following section. Consider the base of the lower- most bed to be a reflector as well. (b) What is the average velocity of the section for a reflection from the base of the dolomite? (c) Using the listed densities calculate the reflection coefficient for each interface (except the base of the dolomite). Which interface gives the strongest

Describe about the primary or P-waves.

9.18. The 10-yr IDF function, i(t), for Boston, Mass- achusetts, can be estimated by the relation i = 1003 (t + 7.0) 0.73 mm/h where i is the intensity in mm/h, and t is the duration in minutes. Use the alternating- block method to determine the hyetograph for a storm with a return period of 10 yr and a duration of 40 min. Use nine time intervals to construct the hyetograph.