$gis = GIS::instance();
$region = $gis->lookup([!hazard_lat], [!hazard_lng], 'region WHERE type = "CR"', 'id');
if ($region[1] == 0) {
  if ([hf:km] < 70) return 'SS';
} else {
  if ([Mw] > 7.7) {
    if ([hf:km] <= 50) return 'SDI'; else return 'SDS';
  } else {
    if ([hf:km] <= 22) return 'AS';
    if ([hf:km] <= 50) return 'SDS';
  }
}