The microtremor wave-field consists predominantly of fundamental-mode surface waves which can provide seismic sounding information. The most common sources of micro-tremor seismic energy are road traffic, industrial machinery, and meteorological sources such as wave action. Velocity studies with the microtremor wave-field enable passive seismic investigations, which are interpreted to yield a shear-wave velocity-depth profile; the technique is an analog of the better-known electrically passive magneto-telluric exploration technique.

The microtremor array method works well in areas where conventional seismic methods are difficult to justify for reasons of cultural noise, environmental restraints and safety. Recent studies demonstrate the usefulness of the microtremor...

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