Images

Equipment is dropped through the holes drilled in the ice on the Little Wind River near Riverton to measure streamflow.

Porites and Acropora coral species in reef flat pools in the National Park of American Samoa on Ofu, Manuʻa Islands Group, American Samoa.

USGS Hawaiian Volcano Observatory scientists examine an outcrop of reddish-brown Hilo ash during a recent study to investigate the origins of volcanic ash deposits on the Island of Hawai‘i. Age dates of lava flows above and below the Hilo ash deposit indicate that the ash was erupted between 3,000 and 14,000 years ago. 

Upstream of USGS gage 08065350, Trinity River near Crockett, TX

The GOMEX box corer is constructed of stainless steel and is used to sample soft sediments at the bottom of lakes, bays, and the ocean. The GOMEX box coring sampler is so-named because it is popular for sampling work in the Gulf of Mexico.

Two foothill yellow-legged frogs (Rana boylii) found dead in Santa Clara, California, USA. (A) One animal had pinpoint red foci on the ventral abdomen. (B) Another animal had a diffusely reddened kidney (arrow).

Photomicrographs from a foothill yellow-legged frog (Rana boylii) found dead in Santa Clara, California, USA. (A) Small areas of epidermal necrosis with apoptotic keratinocytes and nuclear debris are multifocally present (arrow). (B) The liver shows randomly distributed, variably sized areas of coagulative necrosis (*).

PCMSC MarFac field specialists retrieve the GOMEX box corer.

Dive operations with National Park Service and the National Park of American Samoa installing tide, wave, temperature, and salinity sensors on the fore reef in NPSA off the south shore of Ofu, Manuʻa.

USGS scientists install a thermal imaging system in the National Park of American Samoa off the south shore of Ofu, Manua. The system detects temperature variations, like a colder freshwater plume that emanates from the shore.

The water pond at Kīlauea's summit continues to gradually deepen. The pond surface remains variable in color, with a brownish hue in the northern portion, evident through the gaps in steam. USGS photo by D. Swanson.

On December 30, 2015, an HVO geologist wore protective gear during collection of a fresh lava sample for chemical analysis from a Pāhoehoe breakout along scattered Pu‘u ‘Ō‘ō lava flows. Inset image caption: Metadata is written on a bag that holds a sample taken from Pāhoehoe that was collected on August 18, 2006.

Stormy weather moved through the islands over the past day, producing snow at the higher elevations of Mauna Kea and Mauna Loa. This sequence shows the webcam images at the summit of Mauna Loa, and the variable weather throughout the day.

The sampling mechanism (on blue tarp) is prepared and the Unoccupied Aircraft System (UAS) is inspected just before take off to collect water from the Halema‘uma‘u crater lake. Brightly colored flagging tape tied to a cable attached to the UAS indicated depth as the sampling tool was lowered into the water. 

Geophysicist Brian Shiro, manager of the USGS Hawaiian Volcano Observatory's seismic network, was part of HVO's team that installed several new stations on Kīlauea Volcano's lower East Rift Zone to monitor earthquakes during the 2018 eruption.

Hydrologic Technician Sharon Mulready checks equipment on electrical power tower and site 372750122012701 Coyote Creek near Alviso Slough. The tidal gage is located at the confluence of Coyote Creek and Alviso Slough, and is accessible only by boat. The estuary is fed by the Sacramento and San Joaquin Rivers, and various tributaries in the Central Valley.

Scanning Electron Microscope (SEM) image of the silicified microbial mats that form Castle Geyser. USGS image by Dakota Churchill.

The U.S. Geological Survey has released a report on the potential duration of aftershocks of the 2020 Southwest Puerto Rico earthquake sequence (series) to guide public policy decisions, other actions, and help people stay safe and care for themselves and each other.

USGS researchers Chris Moore and Mitchell Lemon took a trip on the R/V Weatherbird in January of 2020 with the University of South Florida College of Marine Science as part of a study on carbon dioxide in the Gulf of Mexico. Carbon Dioxide, or CO2, is a greenhouse gas that can be absorbed by the ocean.

El Servicio Geológico de los EE. UU. ha publicado un informe sobre la duración potencial de las réplicas de la secuencia (serie) del terremoto del Suroeste de Puerto Rico en el 2020 que puede ser usado como guía en las decisiones de política pública, otras acciones y ayudar a las personas a mantenerse seguras y cuidarse a sí mismas y a los demás.

This core sample was taken from an elkhorn coral reef offshore of the Fort Lauderdale region of Florida. Samples from coral skeletons are taken from numerous locations in the core for radiocarbon dating, which tells scientists the age of each coral and of sections within the reef. The corals in this core lived from 7,100 to 6,200 years ago.