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GeoGirls venture into Ape Cave, a 2,000-year-old lava tube on the south flank of Mount St. Helens, as they learn about Mount St. Helens’ eruptive history and lava flows.

GeoGirls venture into Ape Cave, a 2,000-year-old lava tube on the south flank of Mount St. Helens, as they learn about Mount St. Helens’ eruptive history and lava flows.

View of the Mammoth Mountain lava dome complex overlooking Horseshoe Lake.

USGS scientist Pat Hart processing MCS data onboard the R/V Rachel Carson.

Wide angle view of the southern wall of Kīlauea caldera, where there was previously a sulfer rich and highly altered area. The collapse events of 2018 created this exposeure that is approximately 100 m (300 ft) tall, whereas before 2018, the altered area was only exposed for a couple of vertical meters (yards).

Nature always displays vibrant colors. It is only a matter of time until you get the chance to witness its beauty. Even more difficult is capturing this beauty through the lens. Here, we see the magnificent beauty of the falls on the Big Sioux River, from which Sioux Falls, SD takes its name, showing the vibrant colors of nature just before sunset.

Helicopter telephoto zoom of HVO technician performing routine maintenance on a web camera during yesterday's overflight.

Left: Aerial view of the new extension of the Tern Lake thermal area looking southwest. Note the steam in the central part of the image. Right: FLIR (Forward Looking InfraRed) image of the thermal area, with the field of view indicated by the red box in the visible aerial view. Warmest areas are bright white/yellow, while cooler areas are purple.

Data Collection Platform (DCP) setup at a private well monitoring site.

An interactive display at the USGS Earth Resources Observation and Science Center highlighting land change research.

Viewers look through several years of change in an interactive display at the USGS Earth Resources Observation and Science Center.

Today's noticed overflight a recently exposed feature of a hole with a smoother slope descending below it in the eastern wall of Pu‘u ‘Ō‘ō. It is unclear if this is simply a rockfall/collapse feature with a debris slope or part of the conduit that fed episode 61 activity.

Clear weather afforded good views of the water pond in Halema‘uma‘u. No major changes were observed in the pond, but it continues to slowly rise. The water surface was steaming, and had a temperature of approximately 70 degrees C (158 degrees F). For scale, the pond is about 70 meters (230 feet) long.

Telephoto zoom on the feature in the east wall of Pu‘u ‘Ō‘ō.

Aerial view of Halema‘uma‘u at the summit of Kīlauea taken during a USGS Hawaiian Volcano Observatory helicopter overflight on August 1, 2019. The small green patch visible at the bottom of Halema‘uma‘u is a new pond forming at the lowest point of the crater. The pond is at about 525 m (about 1722 ft) elevation.

Aerial view of the new thermal area, in the center left. The existing Tern Lake thermal area is the bright white patch of ground in the upper middle part of the image. West Tern Lake is in the lower right. Research conducted under NPS Geology Programs Milestones Permit 2016-9.

Heading back to Cape Cod Bay after a crew change in Boston, MA

The USGS is advancing the use of large-scale particle-image velocimetry (LSPIV) - a method that uses innovative video analyzation techniques - to measure streamflow.