Figure 4: Acoustic activity during antigorite destabilization.
From: Dehydration-driven stress transfer triggers intermediate-depth earthquakes
(a) Statistical distribution of the relative magnitudes MAE for the entire AE catalogue recorded. The magnitude is calculated as 
where E is the surface of the recorded waveform (V2), considered proportional to the radiated acoustic energy. (b) Log–log Fourier transforms of three AEs recorded on sensor 3, behind a tungsten carbide anvil. Signals display a corner frequency fc of about 2.5 MHz on average, irrespective of the AE magnitude.
