津市西方における一志断層系の新期断層活動

概要

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The Isshi Fault System, located on the eastern rim of the Kinki Triangle, has been said to be active mainly from the early to the middle Quaternary (Matsui, 1967 et al.). The writers have investigated the activity of the Isshi Fault System through the late Quaternary at the southern part of it, west of Tsu City. The findings can be summarized as follows.1) In this area two active faults, Syoda Fault and Kazahayaike Fault, deforming upper and middle terraces vertically are observed. So it is to be considered that the Isshi Fault System has been active through the late Quaternary.2) Middle Terrace I is deformed by Kazahayaike Fault with the vertical displacement of 11m, but no deformation for Middle Terrace II by the fault is recognized (Fig. 2). Syoda Fault has deformed Upper Terrace II, Middle Terrace I, and Middle Terrace II, and vertical displacement of each terrace is 8-10m, recognizing no significant difference between them. Therefore Kazahayaike Fault was active before Middle Terrace II had been formed, and Syoda Fault began tectonic movement after the formation of Middle Terrace II.
東北地理学会の論文