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Field observations today show that the diameters of the crater lake within Halema‘uma‘u at the summit of Kīlauea are about 94 m (308 ft) north-south and around 192-195 m (630-640 ft) east-west. Too much steam at the west end interfered with measurements this morning.

Rigorously Valuing the Role of Hawaiʻi’s Coral Reefs in Coastal Hazard Risk Reduction

Estimated Annual Benefits

Black and White image of a heavy stream flow in Little Santeetlah Creek, Joyce Kilmer Memorial Forest, North Carolina

Ever wondered about how groundwater observation wells are drilled? This photo provides a behind-the-scenes look as USGS drilled a groundwater well in California last month. This photo looks down over a mud tank and shakers, which are part of drilling operations.

Rigorously Valuing the Role of Puerto Rico’s Coral Reefs in Coastal Hazard Risk Reduction

Estimated Annual Benefits

Schematic diagram of the magmatic system underneath Yellowstone caldera and the processes leading to a "shadow zone".

The Coastal Change Hazard (CCH) program’s Stakeholder Engagement and Communication (SEC) component is focused on connecting CCH science to stakeholders to learn more about their needs for data, tools, and information.

Rigorously Valuing the Role of the U.S. Virgin Islands’ Coral Reefs in Coastal Hazard Risk Reduction

Estimated Annual Benefits

On January 17, 2020, USGS-HVO scientists and DOI Unoccupied Aerial System (UAS) team members collected three additional samples of water from the Halema‘uma‘u crater lake. Here, the sampling device and temperature logger were readied for takeoff. The plastic sleeve was attached to the UAS (drone) with a cord about 20 feet (6 m) long.

A photo of a National Park Service information plate on “Sharks in Cape Cod Waters”, Cape Cod, MA, taken during a field study reconnaissance mission.  

A silver-phase American Eel in a northeastern river begins migrating downstream to the ocean to spawn in the Sargasso Sea. The migration can span hundreds of kilometers in freshwater rivers and thousands of kilometers at sea.

Top view of beam orientation and sample volume of a sidelooking ADVM.  The ADVM-measured velocity used to index mean velocity is usually the sample volume x-component of velocity.

Geophysical investigations of Mountain Pass, California, were conducted as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area encompasses Mountain Pass, which is host to one of the world’s largest rare earth element (REE) carbonatite deposits.

Northward view towards Kaktovik from southeastern Arctic National Wildlife Refuge-1002 Area. Location is along Sabbath Creek, a tributary of the Jago River.

Northward view from southeastern corner of Arctic National Wildlife Refuge-1002 Area near Okerokorik River showing gently rolling topography typical of the southern coastal plain.

View to the northeast from east-central Arctic National Wildlife Refuge-1002 Area near the Jago River.

Eastward view from east-central Arctic National Wildlife Refuge-1002 Area near the Jago River. Northeastern Brooks Range visible in distance at right.

View to the northeast from near the eastern boundary of the Arctic National Wildlife Refuge-1002 Area west of the Aichilik River.

Northward view in central Arctic National Wildlife Refuge-1002 Area near the Sadlerochit River showing gently rolling topography typical of the southern coastal plain and meandering creek.

Multibeam bathymetry shown in the spectrum from red (shallower) to blue (deeper) for depths greater than 200 m across the head of Astoria Canyon. The land and continental shelf are shown in grayscale slope shading where darker colors represent steeper slopes.  The modern Columbia River is far right.

The AVM-measured velocity used to index mean velocity can be the line velocity from one acoustic path or from multiple acoustic paths.