Images

The new volcanic-gas monitoring station installed at Mount St. Helens consists of weather monitoring equipment and sensors for measuring the concentrations of water vapor (H2O), carbon dioxide (CO2), sulfur dioxide (SO2), and hydrogen sulfide (H2S) in volcanic gas plumes.

The leading edge of the June 27th lava flow plunged into a deep crack on Kīlauea's East Rift Zone last week, and lava within the crack remained hidden for several days. Over the past day, lava returned to the surface at a point slightly farther along the crack, creating a small island of lava surrounded by thick forest.

Seismic Lab aboard R/V Marcus G. Langseth

Map showing the June 27th flow in Kīlauea's East Rift Zone as of August 25, 2014. The area of the flow as mapped on August 22 is shown in pink, while widening and advancement of the flow as of August 25 is shown in red. The brown line marks the ground crack that channeled lava to the east, where it emerged to form a new pad of lava over the past couple of days.

A view of the small pad of lava that has emerged from the crack over the past day. The lava pad was about 800 m (0.5 miles) long, and was about 1.3 km (0.8 miles) east of the point where lava plunged into the crack.

Another view of the isolated pad of lava that has emerged from the crack. This view is towards the east, along the East Rift Zone. The spot at which lava flowed into the crack is to the west, out of view beyond the bottom of the photograph.

View of the pad of lava with the equivalent view from a thermal camera.

Pu‘u ‘Ō‘ō crater remains partly obscured by thick fume. In particular, the northeastern portion of the crater (bottom left part of image) has recently been entirely obscured to the naked eye, but the thermal camera provides a clear view through the fume, revealing a small lava pond.

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

Surface rupture across Los Carneros Ave just northwest of South Ave in Napa County, CA. Photo taken by USGS from California Highway Patrol helicopter on August 24, 2014

Surface rupture across State Highway 12 at Cuttings Wharf Road - Photo taken by USGS from California Highway Patrol helicopter on August 24, 2014

Damage to a building in downtown Napa, CA caused by the South Napa earthquake. Photo taken by USGS from California Highway Patrol helicopter on August 24, 2014

USGS volunteer Whitney DeLong and geology intern Alexandra Pickering collecting topographic data with a three-dimensional laser scanner along Cuttings Wharf Road in Napa County, CA on August 26, 2014. In the background are engineers inspecting the earthquake surface rupture where is passes through a horse paddock.

Timeline of past drilling activities conducted by countries, private sector firms, government agencies, and academe that have helped to refine global gas hydrate estimates and possible future drilling and production testing

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.

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.

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.

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

Driveway buckling across secondary fault strand at Browns Valley Rd.