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Guidelines and pitfalls of refraction microtremor surveys
Journal of Seismology ( IF 1.6 ) Pub Date : 2021-06-07 , DOI: 10.1007/s10950-021-10020-5
John N. Louie , Aasha Pancha , B. Kissane

The geotechnical industry has widely adopted the refraction microtremor shear-wave velocity measurement technique, which is accepted by building authorities for evaluation of seismic site class around the world. Clark County and the City of Henderson, Nevada, populated their Earthquake Parcel Map with over 10,000 site measurements for building code enforcement, made over a 3-year period. 2D refraction microtremor analysis now allows engineers to image lateral shear-wave velocity variations and do passive subsurface imaging. Along with experience at a basic level, the ability to identify the “no energy area” and the “minimum-velocity envelope” on the slowness-frequency (p-f) image helps practitioners to assess the quality of their ReMi data and analysis. Guides for grading (p-f) image quality, and for estimating depth sensitivity, velocity-depth tradeoffs, and depth and velocity resolution also assist practitioners in deciding whether their refraction microtremor data will meet their investigation objectives. Commercial refraction microtremor surveys use linear arrays, and a new criterion of 2.2% minimum microtremor energy in the array direction allows users to assess the likelihood of correct results. Unfortunately, any useful and popular measurement technique can be abused. Practitioners must follow correct data collection, analysis, interpretation, and measurement procedures, or the results cannot be labeled “refraction microtremor” or “ReMi” results. We present some of the common mistakes and provide solutions with the objective of establishing a “best practices” template for getting consistent, reliable models from refraction microtremor measurements.



中文翻译:

折射微震调查的指南和陷阱

岩土行业已广泛采用折射微震横波速度测量技术,该技术已被世界各地的建筑权威机构认可用于评估地震现场等级。克拉克县和内华达州亨德森市在他们的地震包裹地图中填充了超过 10,000 次现场测量,用于建筑规范执行,时间跨度超过 3 年。2D 折射微震分析现在允许工程师对横向剪切波速度变化进行成像并进行被动地下成像。随着基本水平的经验,识别慢度频率 ( pf ) 图像上的“无能量区域”和“最小速度包络”的能力有助于从业者评估其 ReMi 数据和分析的质量。评分指南 ( pf) 图像质量,以及估计深度灵敏度、速度-深度权衡以及深度和速度分辨率也有助于从业者决定他们的折射微震数据是否符合他们的调查目标。商业折射微震调查使用线性阵列,阵列方向最小微震能量为 2.2% 的新标准允许用户评估正确结果的可能性。不幸的是,任何有用和流行的测量技术都可能被滥用。从业者必须遵循正确的数据收集、分析、解释和测量程序,否则结果不能被标记为“折射微震”或“ReMi”结果。我们提出了一些常见错误并提供了解决方案,目的是建立一个“最佳实践”模板以保持一致,

更新日期:2021-06-07
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