水準測量と潮位による紀伊半島の地殻上下変動（1972～2009年）

DOI Web Site 参考文献63件

書誌事項

タイトル別名
  • Vertical Crustal Deformation in the Kii Peninsula Deduced from Leveling and Sea-Level Data, 1972-2009
  • スイジュン ソクリョウ ト チョウイ ニ ヨル キイ ハントウ ノ チカク ジョウゲ ヘンドウ(1972~2009ネン)
公開日
2013
DOI
  • 10.4294/zisin.66.15
公開者
公益社団法人 日本地震学会

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説明

Long-term slow slip events occur adjacent to the seismogenic zones of major interplate earthquakes along the Nankai Trough in southwestern Japan. GNSS observations began about 20 years ago, but this is much shorter than the cycle of major interplate earthquakes. Knowing past long-term slow slips gives important information for understanding the preparation process of major earthquakes along the Nankai Trough. We extracted an unsteady component of vertical crustal deformations in the Kii Peninsula before GNSS deployment using leveling and sea-level data. GNSS-derived, steady-state vertical displacements related to ongoing subduction of the Philippine Sea Plate were subtracted from the vertical displacements observed by leveling surveys. Monthly mean sea-level data were corrected for atmospheric pressure and hydrographic effects. As a result, postseismic deformation of the 1944 Tonankai and the 1946 Nankai earthquakes was seen from 1972 to 1980. No unsteady component of vertical crustal deformation exceeding 3 cm was found from 1980 to 2009 in the Kii Peninsula. This means that a long-term slow slip event with at least more than moment magnitude (Mw) 6.5 may have not occurred in this period along the southeastern coast of the Kii Peninsula.

収録刊行物

  • 地震　第２輯

    地震　第２輯 66 (2), 15-25, 2013

    公益社団法人 日本地震学会

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