Course Details

AF Academyby AF Academy

Multi-Channel Analysis of Surface Waves: Advanced

Multi-Channel Analysis of Surface Waves: Advanced

Since its first introduction in the late 1990s, the multichannel analysis of surface waves (MASW) method has been utilized by an increasing number of practitioners for a growing array of geotechnical projects, and further researched by many investigators worldwide. The MASW method provides one of the most critically important geotechnical parameters-stiffness of ground materials. It provides this information in terms of seismic shear-wave velocity (Vs) distribution in both vertical and horizontal directions. From an elastic theory viewpoint, shear wave velocity (Vs) is the most powerful indicator of a material's stiffness.

This course covers the basics of seismic surface waves, data acquisition, data processing and the fundamentals in such a way that participants can, upon its completion, engage in common applications such as seismic site characterization (Vs-30m) and mapping soil/bedrock shear-wave velocity (Vs) cross sections. It will demonstrate how to process surface-wave data, and each participant will be guided step-by-step in processing actual field data sets.

All geotechnical engineers and researchers dealing with stiffness of ground and pavement can benefit from attending this course and learning about this state-of-the-art seismic technique.

The Primary Objectives of the course are:

  1. To grasp basic concepts of seismic surface waves,
  2. To understand the overall field procedure for optimal data acquisition,
  3. To provide first-hand experience in processing field data sets to generate two-dimensional (2-D) shear-wave velocity (V) cross sections as well as 1-D profiles,
  4. To recognize typical applications of MASW, and
  5. To be fully flexible in data acquisition and processing so that one can handle challenging situations more successfully.

Data Acquisition

  1. How to determine the critical parameters of source offset (X1), receiver spacing (dx), number of channels, and survey interval for 2-D mapping
  2. How to choose the optimum receiver
  3. Are low-frequency phones (e.g., 4.5 Hz) really critical?
  4. Can higher-frequency phones (e.g., 14-Hz, 40-Hz, etc.) be used?
  5. How to choose the optimum source
  6. Sledge hammer (10-lb, 20-lb, etc.) or weight-drop?

Passive Survey- When and how?

  1. Dispersion Imaging (Complications and Causes)
  2. Understanding fundamentals of dispersion imaging
  3. Fundamental mode (M0) and higher modes (M1, M2, etc.)
  4. Computational artifacts from dispersion imaging
  5. Multi-source offset survey and dispersion images
  6. Methods to process passive data
  7. Common pitfalls

Inversion Analysis

  1. Different Approaches (Pros and Cons):
  2. Traditional fundamental-mode (M0) inversion
  3. Multi-mode inversion (M0, M1, M2, etc.)
  4. Inversion Results- What they represent
  5. Inversion Results- What to believe and what not to believe
  6. Common Pitfalls

Above is a tentative list of topics to be covered. More topics will be added as per requirement of attending participants.

Course Price From

₹14,000.00 / $280.00