Napa Valley Earthquake Response – Trefethen Family Vineyard

The Trefethen Family Vineyard was severely damaged by the 6.1 magnitude earthquake that hit the South Napa area of California. The property is located 8 km North of Napa and occupies about 0.16 square kilometers. Its Eschol building was constructed in 1886 and served as a tasting room for visitors of the winery. During the 2014 South Napa Earthquake, the wooden structure was heavily damaged and weakened to an unknown extent. Access to the structure was severely limited and interior surveys delayed due to the risk of collapse. Visual exterior surveys informed the owners that multiple 5000-gallon tanks, some partially filled with water, had toppled and pushed against the west side of the building, further threatening its structural integrity. Photogrammetric reconstruction of the structure was completed using aerial imaging platforms in order to quantify the damage incurred by the buildings.