Airborne Synthetic Aperture Radar (SAR) image of the A61 Sub-zone (green polygon) with earthquake epicentres of the period 1978-1995 (red dots). Lineaments oriented approximately E-W (shown by the dashed lines to the left) are sub-parallel to the strike of two nodal planes (blue lines) for the two largest events of the sub-zone. The WNW-ESE lineaments and their convergence towards the sub-zone are clearly seen. The Rang Ste-Mathilde fault (Rondot, 1979) is shown and is sub-parallel to one of the nodal planes of a focal mechanism.