Average recurrence interval of Ansei-type earthquakes inferred from Holocene deposits of the Yaizu Plain, Shizuoka Prefecture, Japan

• Kitamura Akihisa

  Institute of Geosciences, Shizuoka University Center for Integrated Research and Education of Natural Hazards, Shizuoka University

• Mitsui Yuta

  Institute of Geosciences, Shizuoka University Center for Integrated Research and Education of Natural Hazards, Shizuoka University

• Takikawa Youki

  Institute of Geosciences, Shizuoka University

Bibliographic Information

Other Title

• 静岡県焼津平野の完新統の解析に基づく安政型地震の平均発生間隔の推定
• シズオカケン ヤイズ ヘイヤ ノ カンシントウ ノ カイセキ ニ モトズク アンセイガタ ジシン ノ ヘイキン ハッセイ カンカク ノ スイテイ

Abstract

The AD 1854 Ansei-Tokai earthquake had a magnitude of 8.4 and was caused by rupturing along mega-thrusts in the Suruga and Nankai troughs, which resulted in ~1.5 m of uplift along the western coast of Suruga Bay. However, no other earthquake with co-seismic uplift has been documented in the region or identified from topographic features such as raised marine terraces along the western coast of the bay. To identify evidence of co-seismic uplift from geological records, we analyzed Holocene sedimentary deposits in drillcore (40 m long and 7 cm in diameter) obtained from the coastal Yaizu Plain. Our results indicate that the upper surface of marine strata occurs at 15.19 m below mean sea level and yields an age of 7410-6890 cal BP. Based on these values and the rate of subsidence during the inter-seismic period, we estimated the average recurrence interval of co-seismic uplift from Ansei-type earthquakes using two models (Models 1 and 2). In Model 1, which assumed a constant subsidence rate, the average recurrence interval was estimated to be 143-174, 188-226, 215-261, or 261-324 yr using mean co-seismic uplifts of 1.0, 1.3, 1.5, or 1.8 m, respectively. In Model 2, which assumed an inconstant subsidence rate, the average recurrence interval was estimated to be 150-178 yr using a mean co-seismic uplift of 1.0 m.

Journal

• The Journal of the Geological Society of Japan

  The Journal of the Geological Society of Japan 122 (10), 523-531, 2016-10-15

  The Geological Society of Japan

Keywords

• Ansei-Tokai earthquake
• Holocene deposits
• recurrence interval
• Yaizu Plain

Details

• CRID: 1390282681216800384
• NII Article ID: 130005289755
• NII Book ID: AN00141768
• DOI: 10.5575/geosoc.2016.0022
• ISSN: 13499963
• ISSN: 00167630
• NDL BIB ID: 027734100
• Web Site: http://id.ndl.go.jp/bib/027734100
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027734100
• Web Site: https://www.jstage.jst.go.jp/article/geosoc/122/10/122_2016.0022/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed