1704年能代・津軽地震の静的断層モデル

(断層モデルによる歴史地震研究の試み)

抄録

A static fault model of the historical earthquake, the Noshiro-Tsugaru earthquake of 1704, has been studied. The quake occurred along the Japan sea coast of northeast district, Honshu Japan, where many damaging earthquakes took place during the period from the 17th to 19th century, and some of those quakes left the traces of coastal up lift. These traces have been investigated in detail by seismologists and geologists. Using these data, we attempt to study historical earthquakes through static fault model. The problem of such study is that sufficient data for modeling are generally not avail able. To overcome this problem, a similarity law between fault parameters, seismo tectonics in the area and theory of rock fracture are used. To check the pertinence of the model, seismic-moment and stress-drop are calculated from the obtained fault parameters, and these values are ascertained to be reasonable from the view point of seismology.