Can you anybody clarify this doubt. I read from some books that the frequency of earthquake will vary from 0.5 to 15 Hz. Professor Richer Allen of Berkeley university claims that they can decide the magnitude of earthquake as soon as we senses the primary wave for first 4 seconds. Concept wise it is O.K. Because the larger tectonic plate slip will create lesser frequency and the smaller size of tectonic plate may create higher frequency. But up to what frequency it is dangerous?. Is it possible to decide the magnitude of earthquake by using accelero meter? Please clarify my doubt. In some books they have compared the acceleration with the magnitude of earthquake
2006-08-25 19:31:14 · 2 answers · asked by A.Ganapathy India 7 in Science & Mathematics ➔ Earth Sciences & Geology
Typically the magnitude of an earthquake is calculated from the maximum amplitude of the waves recorded in a seismogram. We can use either seismometers of accelerometers. Accelerometers are better at recording strong motion close to the earthquake.
Richard Allen and Olson studied the relationship between the period (inverse of frequency) of the first 4 s of the P wave and the magnitude of the earthquake. They used both broadband seismometers and accelerometers. They claim that we can estimate magnitude using only the period (not amplitude) of the wave before the rupture ends. But this is an estimate only, and it is not very accurate. This could be very useful to quickly decide if an earthquake will be big of small. But to really calculate the magnitude of the earthquake you need the amplitude.
2006-08-26 03:22:23 · answer #1 · answered by DarwinV 2 · 2⤊ 0⤋
magnitude is amplitude, not frequency
2006-08-25 19:34:12 · answer #2 · answered by Anonymous · 0⤊ 0⤋