Here's a summary of a talk I've given on an earthquake on the Newport - Inglewood fault - data came from the city of Long Beach I think... (I did this in 2001) - and we haven't touched on a possible tsunami in the mess below..

Earthquake Scenario
Possible 6.5-7.4Mw Earthquake on Newport-Inglewood fault
Surface displacement 3-6 feet - Warping and uplift of about 3 feet

Damage Estimates
Buildings $75,000,000,000
Casualties: 20,000-27,000 deaths and injuries
Damage from fire: $2.5 Billion
Hospital functionality one day after quake: 35%
Fire Station functionality: 30%
School functionality: 29%
Displaced households: 137,515

Damaging aftershocks for about 1 month
405, PCH and other Long Beach roads damaged from liquefaction.
110 Freeway possible emergency access route.
130 miles of high traffic roads damaged
350 bridges damaged
Airports out of service – liquefaction, towers down, no access, fuel tank damage
Harbors and ports facilities damaged, seiches in the harbors
Numerous fires in streets and houses

Fires rage for several days at the refineries in Carson-Wilmington area
Emergency phone service: 25% day 1, 75% day 3, normal use significantly lower.
Power plants shut down for at least 3 days. San Onofre has no damage.
Water lines broken – repaired within a week for most areas.
Waste treatment plants at 50% capacity
Main waste water line into Carson treatment plant from Long Beach heavily damaged.
Lack of fresh water and electricity cause sewage spills into soils and streets contaminating groundwater and the coastline.

Thousands of damaged natural gas mains, valves and service connections.
Many fuel lines rupture. Fuel lines to power plants rupture.
Fuel spills and toxic emissions.

All in all - a Worse quake than the Big One on the San Andreas Fault.