作者:Philippe Jousset et al. 来源:Nature Communications 发布时间:2018/7/12 15:57:36
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使用宽带寻找地质断层

 

论文标题:Dynamic strain determination using fibre-optic cables allows imaging of seismological and structural features

期刊:Nature Communications

作者:Philippe Jousset et al.

发表时间: 2018/07/03

数字识别码:10.1038/s41467-018-04860-y

原文链接:https://www.nature.com/articles/s41467-018-04860-y?utm_source=Other_website&utm_medium=Website_links&utm_content=RenLi-Nature-NATCOMMS-Physics-China&utm_campaign=NATCOMMS_USG_JRCN_RL_cable_sciencenet_article_2nd_July

根据《自然-通讯》发表的一项研究Dynamic strain determination using fibre-optic cables allows imaging of seismological and structural features,光纤电缆已被用于检测地震信号,成像地质断层。这表明未来宽带通信网络或可用于定位和评估地质断层,光纤电缆或可用作地震仪的一种替代工具。

Philippe Jousset

传统的地震台网可能需要耗资几十万美元才能进行运转和维护,但是对于地震多发区域至关重要。不过,有人提出采用通信用的光纤电缆作为一种低成本的地震监测方式。

德国地球科学研究中心的Philippe Jousset及同事在冰岛设置了一项实验:光纤电缆被改造为一系列传感器,用以记录天然地震波和人为地震波。这些传感器通过检测地震波通过时光纤电缆长度的细微变化来量化光纤电缆所承受的应力。作者发现,光纤电缆不仅记录了地震信号,还能详细解析周围断层和其它深层地质结构。

图2:活动地质裂谷内断层的结构。

Jousset et al.

虽然光纤通信网络也许能够用于监测地震灾害,但是作者提醒相关技术还有待进一步的发展。

摘要:Natural hazard prediction and efficient crust exploration require dense seismic observations both in time and space. Seismological techniques provide ground-motion data, whose accuracy depends on sensor characteristics and spatial distribution. Here we demonstrate that dynamic strain determination is possible with conventional fibre-optic cables deployed for telecommunication. Extending recently distributed acoustic sensing (DAS) studies, we present high resolution spatially un-aliased broadband strain data. We recorded seismic signals from natural and man-made sources with 4-m spacing along a 15-km-long fibre-optic cable layout on Reykjanes Peninsula, SW-Iceland. We identify with unprecedented resolution structural features such as normal faults and volcanic dykes in the Reykjanes Oblique Rift, allowing us to infer new dynamic fault processes. Conventional seismometer recordings, acquired simultaneously, validate the spectral amplitude DAS response between 0.1 and 100 Hz bandwidth. We suggest that the networks of fibre-optic telecommunication lines worldwide could be used as seismometers opening a new window for Earth hazard assessment and exploration.

阅读论文全文请访问:https://www.nature.com/articles/s41467-018-04860-y?utm_source=Other_website&utm_medium=Website_links&utm_content=RenLi-Nature-NATCOMMS-Physics-China&utm_campaign=NATCOMMS_USG_JRCN_RL_cable_sciencenet_article_2nd_July

来源:(科学网)

 
 
 
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