Crustal Strain Rates in the Japan Islands: A Comprehensive Understanding of Geodetic and Geological/Geomorphological Data

• SAGIYA Takeshi

  Disaster Mitigation Research Center, Nagoya University

• OTSUBO Makoto

  Research Institute of Earthquake and Volcano Geology, National Institute of Advanced Industrial Science and Technology

Bibliographic Information

Other Title

• 日本列島の地殻ひずみ速度
• 日本列島の地殻ひずみ速度 : 測地学的データと地質・地形学的データの統一的理解
• ニホン レットウ ノ チカクヒズミ ソクド : ソクチガクテキ データ ト チシツ ・ チケイガクテキ データ ノ トウイツテキ リカイ
• —測地学的データと地質・地形学的データの統一的理解—

Abstract

 Geodetic estimates of crustal strain rates in the Japan islands were an order of magnitude larger than geological/geomorphological estimates, which has been an unresolved problem called the strain rate paradox. Ikeda (1996) postulated that geodetic strain mainly reflects elastic strain accumulation due to interactions at plate boundaries. This hypothesis was proven to be correct by the occurrence of the 2011 M_W 9.0 Tohoku-oki earthquake. Confusion between elastic strain and inelastic strain was the cause of the paradox. Significant postseismic deformation observed after the Tohoku-oki earthquake made it possible to distinguish the inelastic contribution from the geodetically observed crustal strain through a comparison with the pre-seismic strain rate pattern, which promoted a better understanding of inelastic deformation in the Japan islands. On the other hand, migration of localized deformation and temporal changes of strain rate are identified over a geological time scale, implying that it is essential to carefully review the methods and the uncertainties of geological/geomorphological strain rates. An integrated understanding of crustal deformation in the Japan islands is being advanced through detailed investigations of crustal strain rates on variable temporal and spatial scales.

Journal

• Journal of Geography (Chigaku Zasshi)

  Journal of Geography (Chigaku Zasshi) 128 (5), 689-705, 2019-10-25

  Tokyo Geographical Society

Keywords

• Japan islands
• strain rate paradox
• inelastic deformation
• geodetic strain rate
• geological/geomorphological strain rate

Details

• CRID: 1390001277393229184
• NII Article ID: 130007745827
• NII Book ID: AN00322536
• DOI: 10.5026/jgeography.128.689
• ISSN: 18840884
• ISSN: 0022135X
• NDL BIB ID: 030064798
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030064798
• Web Site: https://www.jstage.jst.go.jp/article/jgeography/128/5/128_128.689/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed