41. An earthquake's magnitude is a measure of its total energy, as indicated by ground motion recorded on seismographs. 42. Buildings in seismic zones are often constructed to take into account the oscillating frequencies of expected ground motion . 43. "We keep the camera moving very quickly, with a lot of foreground and middle-ground motion , " said Elliott. 44. A quake's magnitude is a measure of its total energy, as indicated by ground motion indicated on seismographs. 45. A quake's magnitude is a measure of its total energy as indicated by ground motion recorded on seismographs. 46. The lack of ground motion means that regional building codes should be relaxed rather than strengthened, Stein said. 47. Am earthquake's magnitude is a measure of its total energy as indicated by ground motion recorded on seismographs. 48. Japan uses a scale of one to seven to measure ground motion in an earthquake at various locations. 49. The magnitude measures the total energy released by an earthquake, as indicated by ground motion recorded on seismographs. 50. An temblor's magnitude is a measure of its total energy, as indicated by ground motion recorded on seismographs.
