New methods of studying regional seismicity and surface faulting



Description of Method. This study outlines the application of special aerial photography using low angle sun illumination for the study of surface faulting. This method is useful in determining both long-term regional seismicity and rate and nature of faulting for a given area. This technique is not completely new since many textbooks accentuate fault scarps by shadow effects, but our new modification is to select optimal sun illumination conditions for each fault by photographing at the ideal time of the year and time of day to enhance their presence and characteristic features.