Event Details and Immediate Impact On the morning of April 25, 1987, residents across the Imperial Valley experienced intense shaking that lasted for nearly a minute. This area sits at the boundary between the Pacific Plate and the North American Plate.
1987 California Earthquake in Historical Seismic Context
Post-event analysis revealed that certain design standards for overpasses were insufficient against the lateral forces generated. Hundreds more sustained injuries, primarily from falling debris and broken glass.
The economic losses were considerable, with estimates placing the total cost in the hundreds of millions of dollars, a significant burden for the local economy reliant on agriculture. With a moment magnitude of 6.
1987 California Earthquake in Historical Seismic Context
Key impacts included: Severe damage to older, unreinforced masonry buildings in El Centro and Brawley. It serves as a crucial historical benchmark, demonstrating that significant earthquakes can occur on smaller, yet still dangerous, fault systems well away from the notorious San Andreas.
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