Thousands of Southern Californians live and work in a type of building vulnerable to collapse in an earthquake. To assess the danger, a team of Times reporters combed through thousands of city and county records to identify these buildings -- concrete structures built before 1976. We found more than 1,000.
Experts say we're overdue for a major earthquake. So find out where the dangers lie, and why so little has been done about them.
Interactive map: Where the buildings are»
Infographic: How concrete buildings fail»
Photos: The perils of concrete»
FAQ: Concrete buildings, earthquake safety and you»
Response: L.A.'s mayor weighs in»
Full coverage: The Times' ongoing look at earthquake safety»