ISO 24057:2022
Geotechnics — Array measurement of microtremors to estimate shear wave velocity profile
This document specifies requirements for equipment, survey procedure, data analysis and reporting of array measurement of microtremors which is one of the non-destructive testing methods with an array of sensors deployed on the ground surface.
This document applies to the array measurement of microtremors to estimate a 1D shear wave velocity profile. This document specifically describes array measurement of microtremors using vertical ground vibration to estimate an S-wave velocity profile by processing microtremor records based on the fundamental mode of Rayleigh waves.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 Equipment
4.1 General
4.2 Sensor
4.3 Time calibration equipment
4.4 Data logger
4.5 Distance and location measuring instrument
4.6 Protective products
5 Survey procedure
5.1 General
5.2 Preparation
5.2.1 Desk study
5.2.2 Array design
5.3 Field observation
5.3.1 Huddle test
5.3.2 Setting of sensors
5.3.3 Recording
5.4 Data organization after field observation
5.4.1 Quality control of the microtremor record
5.4.2 Data storage
6 Data Analysis
6.1 Data organization after field observation
6.2 Phase velocity analysis
6.3 Inversion analysis to S-wave velocity profile
6.4 Uncertainty of phase velocity and S-wave velocity profile
7 Reporting
7.1 General
7.2 Field report
7.3 Analysis report
Annex A (informative) Example of a figure and a table schematic figure of array measurement of microtremors
Annex B (informative) Example of microtremor records and analysis results
Annex C (normative) Array design
Annex D (informative) Frequency characteristics of sensors in huddle test
Annex E (informative) Examples of good and poor quality microtremor records
Annex F (informative) Methods for phase velocity analysis
Annex G (informative) Method for inversion analysis to S-wave velocity profile
Annex H (informative) Uncertainty
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 Equipment
4.1 General
4.2 Sensor
4.3 Time calibration equipment
4.4 Data logger
4.5 Distance and location measuring instrument
4.6 Protective products
5 Survey procedure
5.1 General
5.2 Preparation
5.2.1 Desk study
5.2.2 Array design
5.3 Field observation
5.3.1 Huddle test
5.3.2 Setting of sensors
5.3.3 Recording
5.4 Data organization after field observation
5.4.1 Quality control of the microtremor record
5.4.2 Data storage
6 Data Analysis
6.1 Data organization after field observation
6.2 Phase velocity analysis
6.3 Inversion analysis to S-wave velocity profile
6.4 Uncertainty of phase velocity and S-wave velocity profile
7 Reporting
7.1 General
7.2 Field report
7.3 Analysis report
Annex A (informative) Example of a figure and a table schematic figure of array measurement of microtremors
Annex B (informative) Example of microtremor records and analysis results
Annex C (normative) Array design
Annex D (informative) Frequency characteristics of sensors in huddle test
Annex E (informative) Examples of good and poor quality microtremor records
Annex F (informative) Methods for phase velocity analysis
Annex G (informative) Method for inversion analysis to S-wave velocity profile
Annex H (informative) Uncertainty
Bibliography