The Earthquake Notification Service (ENS) is a free service that can send you automated notification emails when earthquakes happen in your area.
(Example of an ENS notification email)
New accounts default to receiving notifications about earthquakes with magnitude 6.0 or greater however you can customize ENS to only deliver messages for certain areas, at specified times, and to multiple addresses. For most carriers, ENS can also send text notifications to your cell phone.
Instructions and More Information