As a home or property owner, you are responsible for maintaining all gas lines carrying natural gas from the meter to the inside of your home. Be sure to have your natural gas pipes periodically inspected by a licensed plumber to help identify and repair any corrosion and leakage that could be causing unsafe conditions.
In the event of seismic activity, keep your home protected with an earthquake shut-off valve. These valves automatically shut off your natural gas if there is a 5.1 earthquake or higher.