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Updated: Jul 19, 2026

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Data Acquisition Protocol for Determining Embedded Sensitivity Functions
Published on: April 20, 2016
2004年12月26日のスマトラ・アンダマン島における大地震
Thorne Lay1, Hiroo Kanamori, Charles J Ammon
1Earth Sciences Department, University of California, Santa Cruz, CA 95064, USA.
まとめ
2004年と2005年のスマトラ・アンダマン地震は,重大な断層滑りに関与していた. 北部の部分ではスロースリップイベントが発生し,津波の動態に影響を与えました.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- 津波科学 津波科学とは
背景:
- 2004年のインド洋地震 (Mw9.19.3) と2005年の余震 (Mw8.6) は,過去40年間で最大の地震でした.
- これらの出来事は,インド・オーストラリア・ユーラシア・プレート境界の1600キロメートルの断片を破裂させた.
- 2004年の地震は,壊滅的な津波を引き起こし,28万3000人以上が死亡しました.
研究 の 目的:
- 2004年と2005年の巨大地震の空間と時間の滑り分布を分析するために.
- 北部の破裂地帯におけるゆっくりと滑る現象の発生と特徴を調査する.
主な方法:
- 地震破裂プロセスをモデル化するために地震および地質学的データの分析.
- 津波のモデリングと観測分析により,波の発生と伝播を理解できます.
- 断層境界の異なるセグメントに沿った滑り方の比較.
主要な成果:
- バンダ・アチェ,スマトラの近くで,重大な断層滑り (最大15メートル) が観察されました.
- ニコバルとアンダマン諸島のセグメントに沿って,より小さな急速な滑りが発生しました.
- 証拠によると,北部のセグメントではかなり遅い滑り (数分から数時間) が示唆されています.
結論:
- 2004/2005年のスマトラ・アンダマン地震は,南部と北部のセグメントの違いがある異質な滑りを示した.
- ゆっくりと滑るプロセスは,北部の断裂地帯で重要な役割を果たし,津波発生と地震の危険性に影響を与えました.
- 異質なスリップとスロースリップを理解することは,正確な地震と津波の危険性評価に不可欠です.
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