火星で埋もれた若い洪水運河の源とスケールの3D再構築
Gareth A Morgan1, Bruce A Campbell, Lynn M Carter
1Center for Earth and Planetary Studies, Smithsonian Institution, Washington, DC, USA. morganga@si.edu
まとめ
地下水の噴火による巨大な洪水は,火星のマーテ・ヴァリスの流出チャネルを切り開いた. 新しい3Dレーダーデータは,より深い運河とより長い洪水範囲を明らかにし,火星の水文活動に関する以前の考えに挑戦しています.
科学分野:
- 惑星科学は惑星科学である.
- 水文学 水文学とは
- 地質学 地質学 地質学
背景:
- 火星の流出チャネルは,大規模な地下水の洪水を示唆しています.
- マルテ・ヴァリス (Marte Vallis) は,大きな若い流出チャネルで,溶岩の流れによって遮られ,研究が制限されています.
- Marte Vallisの理解は,火星の最近の水文活動を評価するための鍵です.
研究 の 目的:
- レーダーデータを用いて,火星の埋もれた運河を再建する.
- マルテ・ヴァリス (Marte Vallis) の古水文学的パラメータを推定するために.
- マルテ・ヴァリスを彫刻した水の源と範囲を調査する.
主な方法:
- 火星偵察軌道探査機 (MRO) に搭載された浅層レーダー (SHARAD) 装置のデータを活用した.
- 地下チャネル構造の3次元 (3D) 再構築を生成しました.
- レーダープロフィールを分析して,チャネルの寸法と進化を推論した.
主要な成果:
- マルテ・ヴァリスの水源としてCerberus Fossaeを特定しました.
- 運河の既知の東の範囲を180km延長した.
- 判定されたチャネルの深さは,以前の推定値の2倍以上で,2つの切断段階を示しています.
結論:
- セルベルス・フォサエからの地下水の洪水は,マルテ・ヴァリスを彫刻する責任を負いました.
- マルテ・ヴァリスは,火星の最近の重要な水文活動を表しています.
- この発見は,火星の古水文学と運河形成の理解を修正することを必要としています.
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