地上および海底ケーブルによる地震検出のための超安定レーザー干渉計

Giuseppe Marra¹, Cecilia Clivati², Richard Luckett³

¹National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK. giuseppe.marra@npl.co.uk.

Science (New York, N.Y.)

|June 16, 2018

まとめ

既存の光ファイバーケーブルは先進的な周波数計測技術を使って水中の地震を検出できますこのイノベーションは地球地震モニタリングの拡張可能な解決策となり地球の動態に関する理解を深めます

科学分野:

地理学
地震学
光学工学

背景:

海底の地震活動は地球の構造と動態を理解するために不可欠です
海洋における地震計の範囲が限られているため,新しい検出方法が必要です.
既存の電気通信用光ファイバーケーブルは広大な海域を網羅しています

研究の目的:

電気通信用光ファイバーケーブルを用いて地震を検出する可能性を実証する.
既存のインフラを活用してグローバル地震モニタリングを強化する.
周波数計測の応用を地質学的に探求する.

主な方法:

電気通信用光ファイバーケーブルを地震センサーとして利用する.
最先端の周波数計測技術を用いて地震信号を検出する.
地上と海底の光ファイバーから地震データを分析する

主要な成果:

光ファイバーケーブルを用いて地震を検出しました.
検出は75~535kmのファイバーリンクで達成された.
震源から25〜18,500kmの距離で観測された地震.

結論:

光ファイバーネットワークは,水中イベントを含む地震検出に再利用できます.
この技術は,地球規模の地震ネットワークに費用対効果の高い広範なソリューションを提供します.
既存の海底光ファイバーネットワークの導入により,水中地震をリアルタイムで検出できます.

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