GPS地殻変位データを用いた東北地方太平洋沖地震津波の波源域の逆推定およびその精度に関する研究

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タイトル別名
  • Tsunami Source Inversion for the 2011 off the Pacific Coast of Tohoku Earthquake with Geodetic Data from the Global Positioning System and Its Applicability
  • GPS チカク ヘンイ データ オ モチイタ トウホク チホウ タイヘイヨウオキ ジシン ツナミ ノ ナミ ゲンイキ ノ ギャクスイテイ オヨビ ソノ セイド ニ カンスル ケンキュウ

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抄録

A tsunami source inversion analysis has been carried out to estimate static crustal deformation associated with the 2011 off the Pacific Coast of Tohoku Earthquake. We use the Mansinha and Smylie's(1971) analytical solution for the displacements of inclined faults to estimate the slip distribution so that the crustal deformation at each observation site coincides with the displacements calculated from 40 and/or 60 subfaults of 20×20 km2. The maximum slip displacement reaches to 50m at the location about 50km away from the epicenter. Tsunami waveformes are calculated with the fault model assuming a constant rise time of 20s on each subfault and a rapture velocity of 2 km/s. The tsunami waveforms are similar to those of Fujii and Satake simulation which is tsunami waveform inversion with pressure and GPS wave gauge data.

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