Collaborative Research: A Magnetotelluric Instrumentation Facility for Electromagnetic Study of the Continents (EMSOC)

合作研究：用于大陆电磁研究的大地电磁仪器设施（EMSOC）

• 批准号: 9616450
• 负责人: Philip Wannamaker
• 金额: $ 25.36万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-03-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616450&HistoricalAwards=false
• 关键词: Collaborative; Research; Magnetotelluric; Instrumentation; Facility

9616450 Wannamaker This award provides partial support for the upgrade of a portable magnetometer system and the acquisition of associated field equipment by the University of Utah that will become part of a centrally managed pool of equipment and made available to US researchers for field deployment in projects using the magnetotelluric (MT) technique to image the Earth's deep interior structure. The University of Utah is committed to providing the remaining funds necessary to acquire the equipment. Remote sensing of the Earth's crust and upper mantle using MT methods recently has made significant progress in producing images of internal structures with good spatial resolution and with content (electrical conductivity) that is distinct from seismic images (seismic velocities). The MT method makes use of the time-dependent natural electromagnetic fields (EM) induced inside the Earth by the variations of the Earth's external geomagnetic field. The induced electric (telluric) currents diffuse into the Earth and are scattered back from heterogeneities in the electrical resistivity structure. The complex, frequency dependent, relationship between the horizontal magnetic and electric fields at the surface is called the MT impedance and can be inverted to solve for the resistivity (or conductivity) structure of the interior. Conductivity properties of the interior are of considerable interest because they depend strongly on the presence of conducting ionic fluids or melts which are difficult or impossible to detect with other remote sensing techniques. ***

小行星9616450 该合同为犹他州大学升级便携式磁力仪系统和购置相关现场设备提供部分支助，这些设备将成为集中管理的设备库的一部分，并提供给美国研究人员，供其在利用大地电磁技术对地球深部内部结构进行成像的项目中进行现场部署。犹他州大学承诺提供购买设备所需的剩余资金。 最近，利用大地电磁法对地壳和上地幔进行遥感，在制作具有良好空间分辨率和内容（电导率）与地震图像（地震速度）不同的内部结构图像方面取得了重大进展。大地电磁法是利用地球外部地磁场的变化在地球内部感应出随时间变化的天然电磁场（EM）来进行大地电磁测深的。感应的电流（大地）扩散到地球，并从电阻率结构的不均匀性散射回来。地表水平磁场和电场之间复杂的频率相关关系称为MT阻抗，可以反演以求解内部的电阻率（或电导率）结构。 内部的电导率特性是相当感兴趣的，因为它们强烈地依赖于导电离子流体或熔体的存在，这是很难或不可能用其他遥感技术检测。 ***