Images

Surface rupture in soil near the intersection of state Highway 12 and Cuttings Wharf Road in Napa, CA on August 24, 2104

Right-lateral displacement of centerline on Redwood Rd of 2.4 cm along a secondary rupture strand, near the north end of the fault rupture.

Right lateral offset of Browns Valley Rd. centerline, on a secondary fault strand.

Small displacement ground cracks along main rupture near Cuttings Wharf Rd., south of Hwy. 12, taken the day of the earthquake. Displacement in this area grew to ~20 cm right-lateral by Monday, 8/25, due to afterslip.

Left-stepping en echelon fractures characteristic of right-lateral fault displacement at the ground surface. Total fault slip measured near this location was 40-46 cm. Photo taken on main rupture strand near Buhman Rd.

Right-lateral offset of vineyard row of nearly 40 cm. Photo taken on the main fault rupture near Buhman Rd.

Driveway buckling across secondary fault strand at Browns Valley Rd. 

Damaged unreinforced masonry building on Main St. in Napa Downtown.

Continuous "mole-track" running parallel to the strike of the fault indicates some E-W compression in addition to right-lateral faulting. Photo taken near Buhman Rd.

Pavement buckling and tented sidewalk resulting from ~14 cm of compression on Sandybrook Ln., north end of main rupture.

USGS scientists Robert Sickler (left) and Rufus Catchings (right) carrying an auger to a drill hole for seismic survey.

USGS scientists Robert Sickler (below) and Rufus Catchings (standing) attaching a section of an auger bit in order to drill a hole for a seismic survey.

Warren Hall on California State University East Bay's Hayward campus is scheduled to be demolished Aug. 17, 2013 for seismic safety reasons. The landmark building's implosion will produce energy similar to a small earthquake that can be used to study and map the nearby Hayward Fault. In partnership with the university, U.S.

Warren Hall on California State University East Bay's Hayward campus is scheduled to be demolished Aug. 17, 2013 for seismic safety reasons. The landmark building's implosion will produce energy similar to a small earthquake that can be used to study and map the nearby Hayward Fault. In partnership with the university, U.S.

From left, USGS research geophysicist Dr. Rufus Catchings and USGS' Coyn Criley work out the placement of seismometers around Warren Hall (in background) on California State University East Bay's Hayward campus. The landmark building’s implosion will produce energy similar to a small earthquake that can be used to study and map the nearby Hayward Fault.

Following the devastating 2010 Haiti earthquake, the USGS has been helping with earthquake awareness and monitoring in the country, with continued support from the U.S. Agency for International Development (USAID).

Children from a village near Kathmandu greet visitors on May 2, 2013

Temporary movable plank houses for the students.  Tianquan Elementary School.

Damage to local school building.Tianquan Elementary School.

Damage to a local school building. Tianquan Elementary School.

Damage to a local school building. Tianquan Elementary School.