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Steps in Outbreak Investigation01:18

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Soundness of Cement01:17

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The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create ettringite,...
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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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地震性溶岩と爆発性噴火の予測

Y Lavallée1, P G Meredith, D B Dingwell

  • 1Department of Earth and Environmental Sciences, Ludwig-Maximilians University, 80333 Munich, Germany. lavallee@min.uni-muenchen.de

Nature
|May 24, 2008
PubMed
まとめ
この要約は機械生成です。

火山のドームの溶岩は,変形するにつれて地震信号を生成します. 柔軟性から脆性への移行の間,これらの信号をモニタリングすることで,爆発的な火山噴火の予測を改善することができます.

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科学分野:

  • 地質物理学 地質物理学とは地質物理学です.
  • 火山学 火山学とは
  • マテリアルサイエンス 材料科学

背景:

  • 火山のドームの噴火は,しばしば爆発前に増加した地震性と放電率を示します.
  • 現在の噴火の予測は,マグマ自体ではなく,周囲の岩からの地震性に依存しています.
  • 溶岩のリオロジーと変形は噴火様式を決定する上で重要である.

研究 の 目的:

  • ドーム・ラバの地震発生性を調査する.
  • 溶岩リオロジーは,柔らかいから脆いへの移行にどのように影響するかを理解します.
  • 噴火の予測にマグマの地震性の適用を調査する.

主な方法:

  • ドーム・ラバのリオロギー実験.
  • 実験中の継続的なマイクロ地震モニタリング.
  • 異なるストレンスレートにおける地震性の分析.

主要な成果:

  • ドーム・ラバは地震発生性があることが確認されています.
  • 地震特性は,柔らかいから脆いへの移行時に大きく変化します.
  • 高張力率での脆性障害の前に,明確な地震性パターンが出現します.

結論:

  • マグマの地震性は,ドームの溶岩の振る舞いに洞察を与えます.
  • マグマの地震性を監視することで,火山の予測モデルを向上させることができます.
  • マグマの地震性に適用された障害予測方法は,ドーム噴火の有望性を示しています.