House Collapse In Napa.The 6.0-magnitude earthquake that rocked Napa County and surrounding areas may have caused $4 billion in damage and losses, according to Kinetic Analysis Corporation, a risk assessment firm. The quake, the biggest in the Bay Area in 25 years, buckled roads, shattered wine bottles, and damaged houses and historic buildings. Officials tagged 90 to 100 homes as unfit to enter.

The Napa earthquake’s total economic impact — including property damage, losses from business disruptions and lost tax revenue — is estimated at roughly $4 billion. Insured losses will probably be close to 1 billion.

Sunday’s early morning temblor comes at a critical time for Napa County’s multibillion-dollar wine industry, which is in the midst of a major harvest. Although there was little damage to facilities and equipment, thousands of wine barrels and bottles were destroyed.