The slip-rate along the northern Itoigawa-Shizuoka tectonic line active fault system, central Japan

Nobuhisa Matsuta, Yasutaka Ikeda, Hiroshi Sato

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The slip-rates on the northern extent of Itoigawa-Shizuoka tectonic line (ISTL) are estimated based on seismic reflection profiles, drill core data and analysis of tectonic geomorphology. The ISTL is a major tectonic line that passes through the Honshu Island of Japan, and its northern and central segments form an active fault system characterized by high slip-rates. In the Kamishiro basin, near the northern end of the ISTL active fault system, the rate of net slip is estimated to be 4.4-5.4 m/kyr over the last 28 ka, with a vertical-separation-rate of 2.2-2.7 m/kyr. In the Omachi area, south of the Kamishiro basin, the Quaternary slip-rate is estimated to be at least 2.9 m/kyr based on the balanced cross-section derived from reflection profiles and surface geology. The dip angle of 30° determined from the Omachi seismic profile suggests a vertical-separation-rate of at least 1.5 m/kyr. Based on compiled evidence from the available geomorphological and paleo-seismological data, vertical-slip-rates of 1.0-2.9 m/kyr are inferred for the region between Hakuba and Toyoshina over the past 3 ka. The northern ISTL exhibits dip-slip-rate of at least 2.9 m/kyr, with a constant average slip-rate of 2.0-5.8 m/kyr since the Early Quaternary. A paleoseismological data and long-term slip-rate along the northern ISTL has potential for a large earthquake.

Original languageEnglish
Pages (from-to)1323-1330
Number of pages8
JournalEarth, Planets and Space
Volume56
Issue number12
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

Keywords

  • Active fault
  • Northern Itoigawa-Shizuoka tectonic line
  • Slip-rate
  • Tectonic geomorphology

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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