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Updates on the status of Mauna Loa activity will be posted on the HVO web site in the morning and afternoon at: https://www
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https://www.usgs.gov/programs/VHP/volcano-updates
gov/hans2/view/notice/DOI-USGS-AVO-2026-09-04T18:48:35+00:00
Shishaldin Alert Level = ADVISORY Aviation Color Code = YELLOW
https://www.usgs.gov/publications/regional-spectral-analysis-three-moderate-earthquakes-northeastern-north-america
We check the recorded spectra closely for anomalies that might result from site resonance or source effects
https://www.usgs.gov/publications/impact-mine-and-natural-sources-mercury-water-sediment-and-biota-harley-gulch-adjacent
chemistry at sample site HG1; and (3) cold connate groundwater that dominates water chemistry during the dry season as it upwells and reaches the surface
https://www.usgs.gov/centers/arizona-water-science-center/science/estimation-dissolved-solids-concentrations-using
The study developed site-specific relations of specific conductance, water temperature, and dissolved-solids concentrations at four monitoring sites in the Yuma area between Imperial Dam and the United States–Mexico southerly international boundary to predict dissolved-solids concentrations using surrogate
https://www.usgs.gov/centers/norock/science/investigation-aquatic-invasive-species-pristine-sites-greater-yellowstone
For Grand Teton National Park, we provide an example of how invasion risk posed by human activity can be used to dictate site selection in the GRTS framework
https://www.usgs.gov/programs/environmental-health-program/science/multidisciplinary-approach-remediating-watersheds
Reclaimed flood plain and stream channel at former site of the Buckeye mill tailings, 2002
https://www.usgs.gov/publications/water-quality-data-selected-national-park-units-within-southern-colorado-plateau
Water samples were collected three times at each type of site including wells, springs, seeps, tinajas, rivers, a lake, and an irrigation ditch
https://www.usgs.gov/streamstats/streamstats-fundamentals
StreamStats incorporates (1) a map-based user interface for the site selection; (2) a relational data base that contains information for data-collection stations and regression equations used to estimate flow statistics for ungaged sites; (3) a GIS program that allows locating sites of interest in the user interface
https://www.usgs.gov/publications/concentrations-metals-and-trace-elements-aquatic-biota-associated-abandoned-mine-lands
The site with the highest overall contamination within the park, based on both fish and invertebrate data, was WLCC, a site on Willow Creek impacted by acid mine drainage and listed as impaired under Section 303(d) of the Clean Water Act
https://www.usgs.gov/publications/and-polyfluoroalkyl-substances-duluth-mn-area-exposure-and-biomarker-responses-tree
Total egg PFAS concentrations at the ANG site and north of that site were 30–40 times higher than at the reference lake, while nestling PFAS concentrations were 10–15 times higher
https://www.usgs.gov/programs/climate-adaptation-science-centers/science/assessing-vulnerability-cultural-resources
This project will lead to actionable science by direct collaboration with National Park Service (NPS), WUPA, and Tribal partners to develop adaptation/mitigation strategies informed by ancestral practices and model the effects of these strategies on site-specific erosion to identify best practices to preserve cultural
https://www.usgs.gov/special-topics/great-lakes-restoration-initiative/science/areas-concern-effects-contaminants
The source of the PFASs at that location were a former air force base which conducted extensive fire-fighting training exercises at that site
https://www.usgs.gov/programs/environmental-health-program/science/uranium-springs-sampled-near-grand-canyon-likely
Grand Canyon National Park in Arizona is a United Nations World Heritage Site, an international tourist destination, and the region is sacred place to many Native Americans
https://www.usgs.gov/publications/2008-weather-and-aeolian-sand-transport-data-colorado-river-corridor-grand-canyon
The quantitative methods and data discussed here form a basis for monitoring ecosystem processes that affect archeological-site stability
https://www.usgs.gov/centers/alaska-science-center/science/multi-resource-integrated-assessments-mria-and-critical
Provide a means of evaluating a site relative to the surrounding natural and societal landscape
https://www.usgs.gov/centers/arizona-water-science-center/science/national-water-quality-program-monitoring-networks
gov website belongs to an official government organization in the United States
https://www.usgs.gov/programs/environmental-health-program/science/no-adverse-reproductive-effects-observed-tree
The study site, Clarks Marsh, is on the south side of the former Wurtsmith Air Force Base in Oscoda Township, Michigan, and where PFAS occurrence has been previously documented in groundwater and nearby surface waters
https://www.usgs.gov/data/and-polyfluoroalkyl-substances-along-st-louis-river-and-duluth-mn-area-2019-2021
Total egg PFAS concentrations at the ANG site and north of there were 30 – 40 times higher than at the reference lake while nestling PFAS concentrations were 10 – 15 times higher than at the reference lake
https://www.usgs.gov/programs/environmental-health-program/science/study-highlights-complexity-chemical-mixtures-united
This study was an opportunity to assess the factors related to site-to-site differences in stream-contaminant complexity and to put the chemical data into context with potential effects on aquatic animal health
https://www.usgs.gov/centers/pacific-coastal-and-marine-science-center/science/flying-eyeball-measures-grand-canyon-sand
The quantitative methods and data discussed here form a basis for monitoring ecosystem processes that affect archeological-site stability
https://www.usgs.gov/centers/southwest-biological-science-center/science/desert-tortoise-ecology-and-renewable-energy
The overarching focus of this research was to determine how desert tortoise ecology and behavior at the site differ from tortoise populations living in more natural environments
https://www.usgs.gov/programs/environmental-health-program/science/us-geological-survey-develops-approach-assess
While resource extraction has not begun at this mine there has been premining construction activity to prepare the site
https://www.usgs.gov/centers/ohio-kentucky-indiana-water-science-center/science/harmful-algae-blooms-habs
Predicting when and where a bloom may occur is important to protect the public that uses and consumes a water resource; however, predictions are complicated and likely site specific because of the many factors affecting
https://www.usgs.gov/programs/environmental-health-program/science/flood-redistributes-mercury-grand-canyon-aquatic-food
Scientists collected 18–20 benthic invertebrate samples per season and site and sampled the predominant habitats using multiple approaches
https://www.usgs.gov/programs/environmental-health-program/science/dragonfly-larvae-are-effective-bioindicators-mercury
Dragonfly larvae were selected as bioindicators because they are widely distributed and abundant, are key components of aquatic food web energetic pathways, are relatively long-lived, and show high site fidelity (National Park Service
https://www.usgs.gov/staff-profiles/charles-n-alpers
This work has included research on acid mine drainage at the Iron Mountain Superfund site, including documentation of negative-pH water and associated sulfate minerals
https://www.usgs.gov/centers/southwest-biological-science-center/science/timing-really-everything-evaluating-resource
gov website belongs to an official government organization in the United States
https://www.usgs.gov/special-topic/water-science-school/science/nitrogen-and-water
It may be difficult or expensive to retain on site all nitrogen brought on to farms whether for feed, fertilizer, or from animal manure
https://www.usgs.gov/programs/environmental-health-program/science/organic-chemistry-research-core-technology-team
gov website belongs to an official government organization in the United States
https://www.usgs.gov/programs/environmental-health-program/science/organic-geochemistry-research-core-technology-team
gov website belongs to an official government organization in the United States