RAPID: Short-period Seismic Study of Actively Serpentinizing Lithosphere in the Oman Ophiolite

RAPID：阿曼蛇绿岩岩石圈活跃蛇纹石化的短期地震研究

• 批准号: 1945305
• 负责人: Robert Sohn
• 金额: $ 11.99万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1945305&HistoricalAwards=false
• 关键词: RAPID; Short; period; Seismic; Study

Interaction of fluids with magnesium-rich and silicon-poor rocks results in chemical reactions that remove carbon dioxide from the fluids. This has been proposed as a means of carbon sequestration. The world's largest body of such rocks occurs in Oman, and NSF has funded a drilling program to assess the mechanisms and chemistry of fluid-rock interaction. A hydrophone array was deployed in two of the drill holes to measure cracking related to this interaction. Preliminary data show an unanticipated high frequency of cracking, which also produces standing waves with the drill hole, an organ-pipe effect. This RAPID proposal is to now deploy a dense network of seismometers around the holes, in order to locate the cracking, measure how the cracks open, and measure the velocity structure around the holes. There is substantive collaboration with scientists from Oman.A network of short-period seismometers will be deployed around a hydrophone-instrumented ICDP hole in the Oman ophiolite. Data obtained during deployment of the hydrophones show unexpectedly high amounts of seismicity and the production of acoustic standing waves in the water column. This array will permit accurate location of the events, which occur at a rate of about 10 per hour, and focal mechanisms. Moreover, the standing waves can be used as a source to image the mantle section. The motivation behind the Oman project is to test the feasibility of carbon sequestration in ultramafic rocks. The project involves substantive international collaboration.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

流体与富镁和贫民窟岩石的相互作用导致化学反应，从而从流体中去除二氧化碳。这已被提出是碳固执的一种手段。世界上最大的岩石机构发生在阿曼，NSF资助了一项钻探计划，以评估流体岩石相互作用的机制和化学反应。将水文阵列部署在两个钻孔中，以测量与这种相互作用相关的裂纹。初步数据显示出意外的裂纹高频，这也会产生带有器官管效应的钻孔的站立波。这个快速的建议是现在要在孔周围部署密集的地震仪网络，以定位裂缝，测量裂缝的打开方式并测量孔周围的速度结构。与阿曼的科学家进行了实质性的合作。一个短期地震仪网络将在阿曼蛇绿岩的一个启发性的ICDP孔周围部署。在部署过程中获得的数据显示出意外的地震性和水柱中声波的产生。该阵列将允许以每小时约10次的速度和焦点机制进行准确的事件位置。此外，站立波可用作图像地幔截面的源。阿曼项目背后的动机是测试超镁铁质岩石中碳固相的可行性。该项目涉及实质性国际合作。该奖项反映了NSF的法定任务，并被认为是使用基金会的知识分子优点和更广泛影响的审查标准的评估值得支持的。