Subsurface mapping by ambient noise tomography: Difference between revisions

Revision as of 16:30, 2 October 2023

Revision as of 03:49, 4 October 2023

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4. Example of geophysical survey technique: electrical resistivity, gravity anomaly, seismic

5. Use of ambient noise: raising usage and thus attention

Draft 1

Ambient noise, one of the seismic waves, is the background noise produced by various natural and human activities. Recently scientists, especially seismologists, discover the potential of ambient noise on subsurface structure mapping. Borehole drilling is considered as the most ordinary method to understand the subsurface lithology, but it is invasive. Geophysical survey acts as an alternative non-invasive measure on the exploration of subsurface structure. Some of the main survey technique include electrical resistivity, gravity anomaly and seismic. Comparing with other geophysical survey technique, measuring ambient noise becomes a rising star.

Part 1: Source of Ambient Noise

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3.2 Periodic change of ambient noise

4. Difficulty in collecting ambient noise

Draft 1

Seismic wave can be classified into P-wave, S-wave, Rayleigh wave and love wave. The latter 2 types are surface waves.

Part 2: Seismic Velocity Structure Modelling

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2.1 cross correlation

2.2 green's function

2.3 Inversion

3. Subsurface structure correlation with velocity imaging

3.1 example of subsurface structure