Subsurface mapping by ambient noise tomography

Title: Subsurface Mapping by Ambient Noise Tomography (Brief Introduction) 1. Understanding subsurface (lithology, structure...): important in several discipline: geotechnical engineering, volcanology, geomorphology, civil engineering, economic geology... 2. Drilling borehole: traditional method, but invasive 3. Geophysical survey: non-invasive method to image the subsurface 4. Example of geophysical survey technique: electrical resistivity, gravity anomaly, seismic 5. Use of ambient noise: raising usage and thus attention

Part 1: Source of Ambient Noise 1. Brief classification of seismic source

  1.1 Type of seismic waves
  1.2 Frequency range of ambient noise

2. Nature of ambient noise: passive/background noise

  2.1 Active/Artificial Noise
  2.2 Passive/Natural Noise

3. Variation of Ambient Noise

  3.1 Cause of variation
  3.2 Periodic change of ambient noise

4. Difficulty in collecting ambient noise

Part 2: Seismic Velocity Structure Modelling 1. Data collection method

  1.1 Tools of collection
  1.2 Available online source

2. Theory of ambient noise correlation

  2.1 cross correlation
  2.2 green's function

3. Subsurface structure correlation with velocity imaging

  3.1 example of subsurface structure
  3.2 linkage of structure with velocity zone
     3.2.1 low-velocity zone
     3.2.2 high-velocity zone

Part 3: Application of Subsurface Mapping 1. Exploration of underground mines 2. Volcano Monitoring 3. Landslide Monitoring