アクティブ・プレート・ボーディング・フォールスの極端な水熱条件
Rupert Sutherland1,2, John Townend2, Virginia Toy3
1GNS Science, PO Box 30368, Lower Hutt, New Zealand.
Nature
|May 18, 2017
まとめ
活発なプレート境界断層は,断層の急速な移動と景観の発展によって引き起こされる高流体圧と地熱グラデントで,極端な水熱状態を示します. これらの条件は地震の分布と断層の振る舞いに影響を与えます.
科学分野:
- 地理学
- 構造地質学
- 構造学
背景:
- 温度と流体圧は,岩石の変形,鉱化,そして地質上の断層の地震分布の重要な要因です.
- 大陸内層の地殻は通常,水静流体圧と~31°C/kmの地熱グラデントを示している.
- 高温 (>300〜450°C) は,クォーツとフェルドスパートの可塑性による無地震の流れを促進し,地震の頻度を下げます.
研究 の 目的:
- アルプス断層の上部における温度と流体圧の条件を調査する.
- 活性断層における摩擦-機械的プロセスと地震破裂サイクルに影響を与える水熱条件を理解する.
主な方法:
- アルプス断層の壁に穴を開け 893メートルの深さまで
- 穴内の孔液圧と温度グラデーションを測定する.
- 断層滑り,流体流動,景観の発展の相互作用をモデル化するためにデータを分析します.
主要な成果:
- 掘削孔は9±1%の液体圧のグラデントを明らかにした.
- 断層の吊り壁に平均125±55°C/kmの地熱傾斜が記録された.
- これらの極端な条件は 断層の急速な移動と熱を集約する トポグラフィ的に駆動された流体の流れに起因します
結論:
- 活発なプレート結合断層は,地震発生地帯で非常に異常な液体圧と温度グラデーションを発生させる可能性があります.
- 断層の滑り方や 岩石の変化や 景観の進化による ポジティブなフィードバックが これらの極端な水熱状態を 引き起こしています
- これらの条件は,断層の機械的行動と地震の可能性に大きな影響を与えます.
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