| 31. | Lighter ground motions ( MM IV & ndash; III ) spread through much of south-central Mexico.
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| 32. | It is a record of the ground motion at a measuring station as a function of time.
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| 33. | Magnitude measures the total energy released by a quake, as indicated by ground motion recorded on seismographs.
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| 34. | Because it detonates underground, much of its energy translates into ground motion that can destroy underground structures.
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| 35. | In other words, Segall and his colleagues also see little if any ground motion in New Madrid.
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| 36. | Liquefaction occurs when intense ground motion in soft soil saturated with water causes the liquid to rise.
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| 37. | Each increase of one number on the Richter Scale means the ground motion is 10 times greater.
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| 38. | Every increase of one number on the scale means that the ground motion is 10 times greater.
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| 39. | MAGNITUDE : 7 . 5 on the open-ended Richter scale, which records ground motion on a seismograph.
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| 40. | "It probably was the best fit between simulated and observed ground motions that's been found so far ."
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