Subaru 2011 Tribeca Owner's Manual page 243

1-58
Seat, seatbelt and SRS airbags
both driver's and front passenger's SRS
frontal airbags may be activated when the
vehicle sustains a hard impact in the
undercarriage area from the road surface
(such as when the vehicle plunges into a
deep ditch, is severely impacted or
knocked hard against an obstacle on the
road such as a curb).