Shakey at best.
Earth has been e-mailing me for 6 months now.
Earthquake Notification Mailing Lists
From site:
The data displayed on the California recent earthquakes pages are preliminary. They are largely computer generated and may not have received human review or official approval. Inaccuracies in the data may be present because of instrument or computer malfunctions. Subsequent review may result in significant revisions to the data.

Data users are cautioned to consider carefully the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences.

good post that can really help people in some areas