Electromagnetic Remote Sensing of Structures Controlling Seismicity in the Puget Sound Region

普吉特海湾地区地震活动控制结构的电磁遥感

• 批准号: 9118538
• 负责人: John Booker
• 金额: $ 9.39万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118538&HistoricalAwards=false
• 关键词: Electromagnetic; Remote; Sensing; Structures; Controlling

Ductility directly related to crustal fluids may play a very important role in the distribution of crustal seismicity and large scale crustal deformation in the Puget Sound region. The strong correlation between crustal fluids and electrical resistivity makes for specific, testable predictions about the resistivity structure. The most fundamental are that there will be a sharp resistivity decrease at the top of the seismically active crust if it coincides with the base of the volcanics and another at the bottom of the seismically active lower crust if it coincides with a brittle- ductile transition associated with trapping of water by a metamorphic boundary. A combined Magnetotelluric (MT) and Magnetic variation (MV) array study capable of making the required tests will be carried out.

与地壳流体直接相关的韧性可能对普吉特海湾地区地壳地震活动和大范围形变的分布起着非常重要的作用。地壳流体和电阻率之间的强烈相关性有助于对电阻率结构进行具体的、可测试的预测。最根本的是，如果地震活动地壳的顶部与火山岩的底部重合，那么地震活动地壳顶部的电阻率将急剧下降，如果地震活动地壳底部的电阻率与变质边界截留水有关的脆韧性转变重合，则地震活动地壳底部的电阻率将急剧下降。将进行能够进行所需测试的大地电磁(MT)和磁变(MV)组合阵列研究。