ISM traffic light protocols are implemented to manage induced seismic risk associated with Oil and Gas extraction activity. Incorrect application of protocols can have significant consequences for operators, associated communities and other stakeholders. Accordingly, it is critical that the triggering criteria is based on inputs which are as accurate as possible. We examine a western Alberta case study for a common triggering criteria, local magnitude. We develop a region-specific local magnitude formula that improves measurement accuracy in comparison to other standard methods, and demonstrate the potential impact of the discrepancy using a real event.