权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

COLLABORATIVE RESEARCH: In Situ and Laboratory Measurement of Seismic Velocity Across an Exposed Brittle Fault Gouge Zone

合作研究：现场和实验室测量暴露的脆性断层泥带的地震速度

基本信息

批准号：
9909376
负责人：
John Hole
金额：
$ 8.61万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-12-15 至 2001-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909376&HistoricalAwards=false
关键词：
COLLABORATIVE RESEARCH Situ Laboratory Measurement

项目摘要

Hole 9909376 In crustal faults such as the San Andreas and subduction zone megathrusts, anomalous seismic velocity, seismic reflectivity, and electrical conductivity have been interpreted as signatures of fluid content, pore pressure, fault gouge presence or composition, and damage zone effects. However, the relative contribution of these factors to detectable fault zone properties is poorly known. The PIs will conduct a combined field and laboratory study of seismic velocity and electrical conductivity across an unweathered exposure of the active Seal Cove strand of the San Gregorio Fault in Moss Beach, California. Compressional and shear wave velocity and anisotropy and electrical conductivity will be measured in the field through very high-resolution seismic and resistivity surveys, and in the laboratory on representative samples at elevated pressure. Field measurements will document long length-scale effects that cannot be sampled in the laboratory, bridging the gap between laboratory and geophysical field data, while the experimental data will document pore pressure and stress effects at depth and the relationship of physical properties to lithology and structural geology. The results will be used along with existing lithologic and structural data to create an integrated model of fault zone physical properties.

地壳断层(如圣安德烈亚斯和俯冲带大型逆冲)中的9909376孔、异常地震速度、地震反射率和电导率被解释为流体含量、孔隙压力、断层泥的存在或组成以及破坏带效应的标志。然而，这些因素对可探测断裂带属性的相对贡献却知之甚少。PIS将对加利福尼亚州莫斯比奇圣格雷戈里奥断层活动海豹湾一股未经风化暴露的地震速度和电导率进行现场和实验室联合研究。纵波和横波速度、各向异性和电导率将在现场通过极高分辨率的地震和电阻率测量，并将在实验室对具有代表性的样品在高压下进行测量。现场测量将记录实验室无法采样的长尺度效应，弥合实验室和地球物理场数据之间的差距，而实验数据将记录深层的孔压和应力效应，以及物性与岩性和构造地质的关系。结果将与现有的岩性和构造数据一起使用，以创建断裂带物理性质的综合模型。