Collaborative Research: A National Instrument Facility for ElectroMagnetic Studies of the Continents

合作研究：大陆电磁研究国家仪器设施

• 批准号: 9616986
• 负责人: Stephen Park
• 金额: $ 18.81万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-15 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616986&HistoricalAwards=false
• 关键词: Collaborative; Research; National; Instrument; Facility

9616986 Park This award provides partial support for the acquisition of portable magnetometers and associated field equipment by the University of California at riverside 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 California at Riverside is committed to providing the remaining funds necessary to acquire the equipment system. 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. ***

9616986 PARK该奖项为加州大学河滨分校购买便携式磁强计和相关野外设备提供部分支持，这些设备将成为集中管理的设备池的一部分，并可供美国研究人员在使用大地电磁(MT)技术成像地球深层内部结构的项目中进行现场部署。加州大学河滨分校致力于提供购买设备系统所需的剩余资金。利用大地电磁方法对地壳和上地幔进行遥感，最近在产生具有良好空间分辨率的内部结构图像方面取得了重大进展，并且具有与地震图像(地震速度)不同的内容(电导率)。大地电磁方法利用地球外部地磁场的变化在地球内部产生随时间变化的自然电磁场。感应的电(大地)电流扩散到地球上，并从电阻率结构中的不均匀处散射回来。地表水平磁场和电场之间复杂的、与频率相关的关系称为大地电磁阻抗，可以反演出内部的电阻率(或导电性)结构。内部的导电性很有意义，因为它们在很大程度上依赖于导电离子液体或熔体的存在，而用其他遥感技术很难或不可能探测到这些液体或熔体。***