Microtremor array measurement (MAM)

This technique, similar to the MASW, is in charge of the study and analysis of surface waves with the difference that the analysis is made from seismic noise (passive or naturally occurring sources). It is an excellent alternative in sites with high levels of seismic noise, where the MASW can be affected by it.

There is also a difference in the content of registered frequencies. As the MASW needs an active seismic source (usually a hammer) it produces high frequencies, providing a better information of the shallower subsurface, and the MAM uses a passive seismic source (usually naturally occurring vibrations) which are richer in lower frequencies, providing better information regarding deeper strata. Given these characteristics, it is possible and recommended to conduct a combined study using both techniques.

Example application of a MAM survey in a thermoelectric power station.