中央アンデス山脈を横断するNAZCAと南米の収束の宇宙地質観測
Norabuena1, Leffler-Griffin, Mao
1E. Norabuena, Instituto Geofisico del Peru, Apartado 3747, Lima 100, Peru, and Rosenstiel School for Marine and Atmospheric Sciences, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA. L. Leffler-Griffin and S. Stein, Departme.
Science (New York, N.Y.)
|January 22, 1998
まとめ
宇宙地検データは,ナズカ・プレートと南米・プレートの境界で重要なプレート運動を明らかにしています. ほとんどの収束は,ロックされたインターフェイスに蓄積され,地震の危険性がありますが,内陸の縮小はアンデス山脈の形成を継続しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- 地球科学 地球科学 地球科学
背景:
- ナスカプレートと南米プレートの間の収束境界は,地質学過程を理解するための重要な領域です.
- 以前の研究では,このゾーン内の複雑な変形パターンが示されています.
研究 の 目的:
- ペルーとボリビアのナズカ・南米プレート境界の動きの速度と方向を定量化するために.
- プレート界面と大陸の地殻の間の変形の分割を理解するために.
主な方法:
- 宇宙地検データ (GPS,InSARなど) の分析.
- 地殻の変形とストレスの蓄積のモデリング.
主要な成果:
- 閉じたプレート界面に年間約30〜40mmの収束が蓄積され,将来の大きな地震の可能性を示しています.
- 10〜15mm/yrの地殻縮小は,アンデス亜部のフォアランドの折りたたみと推力ベルトで起こり,アンデス山脈の上昇に寄与します.
- 斜め収束にもかかわらず,沿岸の前弓のスライバーの制限された沿い溝の動き (5-10 mm/yr) が観察されました.
結論:
- ナズカ・南米プレート境界線は活発に変形しており,巨大プレートに著しいストレスの蓄積が起こっています.
- 陸地内部の地殻の縮小が続いていることは,アンデス山脈の継続的な成長を強調しています.
- 観測された変形パターンは,大陸の縁のオーロゲネシスと地震の危険性のメカニズムに関する重要な洞察を提供します.
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