Arrhythmias can be treated by ablating the heart tissue in the regions of abnormal conduction, e.g. activating too early or with a different speed. The key of the treatment then lies in the location of these areas. In current clinical practice, 3-D electroanatomic maps can be created during the procedure by probing the heart with a specific catheter. However, it is a time-consuming and invasive procedure. Electromechanical wave imaging (EWI) is an ultrasound-based technique that can provide 2-D maps of the electromechanical activation of the heart. Yet, the activation follows a complex 3-D pattern. We thus propose an automated method to generate pseudo 3-D activation maps using several 2-D maps. These maps are subsequently analyzed qualitatively to locate the source of arrhythmia or quantitatively to evaluate the conduction speed in the myocardial tissue.