Images

This close-up view of the western fissure within Halema‘uma‘u at the summit of Kīlauea was captured on Friday, July 16, 2021. HVO scientists were making a routine observational visit to the crater rim; no changes to the inactive lava lake were detected.

Seismogram from station YTP in Yellowstone National Park showing earthquakes from the swarm beneath Yellowstone Lake that began late on July 15, 2021. Each row represents 30 minutes of seismic data.

The Mojave River is the largest of the streams and rivers that flow through southwestern San Bernardino County, CA. It extends more than 100 miles east from its source in the San Bernardino Mountains to the end east of Afton Canyon. This 3D animation takes the viewer on a tour of the entire length of the river.

Scientists RC Mickey and Dave Thompson from the USGS St.

Gerry Hatcher controls SQUID-5 image acquisition over Looe Key Sanctuary Preservation Area (SPA). 

Scientists RC Mickey and Dave Thompson from the USGS St.

Once thought to be extinct, the Pacific pocket mouse (Perognathus longimembris pacificus) was rediscovered in 1993 and is currently found at three population sites along the southern California coast.

Scanning electron microscope image of elongate amphiboles, some of which are asbestiform, collected from attic insulation from Libby, Montana. 

Marcus G. Langseth departs Newport, Oregon (Yaquina Bay) for Cascadia Project OBS Deployment Leg

Geologic block-diagram and conceptual model of possible flow systems associated with thermal areas at Mammoth Hot Spring (MHS) area from Sorey (1991) (USGS Water-Resources Investigations Report 91-4052).  Also shown are the Bear Creek Hot Springs (BC) and La Duke Hot Spring (LD).

An acoustic Doppler current profiler (ADCP) on the Natchaug River near Chaplin, CT (USGS station 01120790).

A Hawaiian Volcano Observatory geologist uses a laser rangefinder to survey points across the solidified lava lake surface in Halema‘uma‘u, at the summit of Kīlauea. No significant changes in lake surface elevation have been observed in recent weeks. USGS photo by M. Patrick taken on July 9, 2021.

Decreasing water levels in the southern arm of the Great Salt Lake expose microbialite communities that are normally underwater.  

Little Snake River near Dixon low streamflow

Low Flows at Little Snake River near Dixon streamgage

Orange and black excluder device (left) will contain minerals, but intended to allow livestock access while excluding wildlife. Mineral block to the right of excluder device.

Relative risk maps of combined Bsal risk, comparing (a) pre-action risk (2010–2015), to (b) risk after implementation of surveillance and of importation restrictions on over 200 salamander species. Relative risk scores were scaled to 2010–2015. (c) Change in relative risk score per county as proportion of pre-action risk.

Photo Contest Winner | July 2021 | Honorable Mention 1

Taking a w​​​​​ater sample in Green River

The USGS Active Groundwater Level Network includes about 20,000 wells that have been measured by the USGS or USGS cooperators at least once within the past 13 months. The animation shows snapshots of  daily water-level statistics in the network for June 2021.

A view looking north into Halema‘uma‘u on July 2, 2021. Although eruptive activity has paused at the summit of Kīlauea, HVO geologists still monitor the lava lake and summit area regularly. Lava lake surface depths remain the same over the past few weeks.

Epicenters of 6,188 earthquakes in the Hebgen Lake region since 1990 determined by the University of Utah Seismograph Stations and the Montana Bureau of Mines and Geology. All epicenters have horizontal uncertainties of 1.0 km or less.