地震に伴うStrain Stepについて

抄録

Strain steps associated with earthquakes have been observed with super-invar-bar extensometers at Iwakura, Amagase and Donzurubo Observatories for earthquakes of magnitude 3.2-7.9. The stability of these instruments for vibration was confirmed experimentally by two methods. Strain step amplitude dependance upon distance seems to be R^-2.4, and based on a few assumptions, fault length is related to earthquake magnitude by the following equation, M = -8.2+2.2log10 Lwhere L is fault length in cm.