true about the asthenosphere?A)it is completely molten high velocity upper mantleB)it is partially molten (squishy) low velocity upper mantleC)it extends down to the core mantle boundary___27. A magnitude 6 earthquake releases _______as much energy as a magnitude 4.___28. What is true about aftershocks?___29.The type of fault that occurs in an area undergoing a compressional force is a......___30. The difference in time between the arrival of the P-wave and the S-wave tells you.....A)the distance to the focus or hypocenterB)the magnitude of the earthquakeC)the size of the earthquake___31. The Modified Mercali scale would beleasthelpful in describing the... ___32. The magnitude of a quake can be quickly estimated by the....___33. The 9.6 Chile (‘60), the 9.2 Alaska (‘64), and the Indonesia (‘04) quakes were generated by.....___34. San Diego is located on theA)North American plateB)Juan de Fuca plateC)the Pacific Plate___35. Which of the following best describes the San Andreas Fault?___36. At your location you notice an incoming earthquake on a seismogram. The time between the P-wave and S-wave is 30 seconds. The seismogram records the maximum amplitude of the S-wave at 15 millimeters. What is the Richter Magnitude? ___37.How far from the quake is the seismograph located?
3___38. Which of the following is used to calculate the moment magnitude of an earthquake?4A)the length and depth of the fault ruptureB)the amplitude of the S wave on the seismogramC)the time between the P and S wave___39. If the “duration” of strong shaking of a quake lasted for 30 seconds what would be the approximate Momentmagnitude....___40. How long would it take to form 2,000 kilometers of ocean crust at 2 centimeters
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