Unified Interior Regions

Guam

The Pacific Region has nine USGS Science Centers in California, Nevada, and Hawaii. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

States L2 Landing Page Tabs

The Pacific Region has nine USGS Science Centers in California, Nevada, and Hawaii. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

News

Date published: November 5, 2020

Invasive Brown Treesnake Present on Cocos Island, Agencies Working to Prevent Further Spread

For the first time, an invasive brown treesnake population has been found on Cocos Island, an 83.1 acre atoll located 1.5 miles off the southwest coast of Guam.  

Date published: July 21, 2020

Assessment of Mercury Bioaccumulation in US National Parks Using Citizen Science

A team of federal, academic, and NGO researchers conducted a national-scale assessment of mercury bioaccumulation in aquatic ecosystems using dragonfly larvae as biosentinels.

Date published: May 22, 2020

USGS Brown Treesnake Research Continues at Guam National Wildlife Refuge

On May 14, Director Reilly signed a Memorandum of Agreement with the Department of the Navy and the U.S. Fish and Wildlife Service. The MOA provides for continuity of operations for the USFWS and the USGS with construction of new office and lab facilities on the Guam National Wildlife Refuge in conjunction with DOD’s construction of a Marine Corps firing range.

Filter Total Items: 30
Date published: September 11, 2020
Status: Active

Coral Reef Project

Explore the fascinating undersea world of coral reefs. Learn how we map, monitor, and model coral reefs so we can better understand, protect, and preserve our Nation's reefs.

Date published: August 28, 2020
Status: Active

Low-lying areas of tropical Pacific islands

Sea level is rising faster than projected in the western Pacific, so understanding how wave-driven coastal flooding will affect inhabited, low-lying islands—most notably, the familiar ring-shaped atolls—as well as the low-elevation areas of high islands in the Pacific Ocean, is critical for decision-makers in protecting infrastructure or relocating resources and people.

Date published: July 20, 2020
Status: Active

The Value of U.S. Coral Reefs for Risk Reduction

Summary of the report, “Rigorously valuing the role of U.S. coral reefs in coastal hazard risk reduction”

    Contacts: Curt Storlazzi, PhD, Michael Beck
    Date published: July 15, 2019
    Status: Active

    Coral Reef Project: Guam

    As part of the USGS Coral Reef Project, the USGS is working on the west coast of Guam to help determine the effects of sedimentation in nearshore waters.

    Date published: February 19, 2019
    Status: Active

    Risk Analysis of Invasive Freshwater Fishes in Hawaii and Micronesia

    Invasive species threaten biodiversity around the world, especially on islands. USGS scientists are helping to identify fish species that have the greatest potential to invade the fresh waters of Microneisa. 

    Date published: December 10, 2018
    Status: Completed

    Exploring: Reservoir Capacity And Sedimentation Of The Fena Valley Reservoir Guam

    The Fena Valley Reservoir, located in southern Guam, is the primary source of water for the United States Naval Base Guam and nearby village residents. At full capacity, the reservoir surface area extends approximately 0.30 mi2, and drains a watershed area of about 5.88 mi2.  After reservoir construction, periodic bathymetric surveys, coupled with sedimentation models, ...

    Date published: July 20, 2018
    Status: Active

    Guam (GUA)

    The Guam observatory was established in 1957. The observatory is situated on property owned by the U.S. Air Force according to terms of an agreement with the USGS and the Geomagnetism Program. The facility is shared with the USGS Fort Collins Science Center (FORT) ...

    Filter Total Items: 21
    Date published: January 1, 2019

    Projected flood extent polygons and flood depth points based on 10-, 50-, 100-, and 500-year wave-energy return periods, with and without coral reefs, for the State of Hawaii (the islands of Hawaii, Kahoolawe, Kauai, Lanai, Maui, Molokai, Niihau, and Oahu

    This part of the data release presents projected flooding extent polygon (flood masks) and flooding depth points (flood points) shapefiles based on wave-driven total water levels for the State of Hawaii (the islands of Hawaii, Kahoolawe, Kauai, Lanai, Maui, Molokai, Niihau, and Oahu). For each island there are 8 associated flood mask and flood depth shapefiles: one for

    Date published: January 1, 2019

    Projected flood extent polygons and flood depth points based on 10-, 50-, 100-, and 500-year wave-energy return periods, with and without coral reefs, for the Territory of Puerto Rico (the islands of Culebra, Puerto Rico, and Vieques)

    This part of the data release presents projected flooding extent polygon (flood masks) and flooding depth points (flood points) shapefiles based on wave-driven total water levels for the Territory of Puerto Rico (the islands of Culebra, Puerto Rico, and Vieques). For each island there are 8 associated flood mask and flood depth shapefiles: one for each four nearshore wave energy

    Date published: January 1, 2019

    Projected flood extent polygons and flood depth points based on 10-, 50-, 100-, and 500-year wave-energy return periods, with and without coral reefs, for the Territory of Guam

    This part of the data release presents projected flooding extent polygon (flood masks) and flooding depth points (flood points) shapefiles based on wave-driven total water levels for the Territory of Guam. There are 8 associated flood mask and flood depth shapefiles: one for each of four nearshore wave energy return periods (rp; 10-, 50-, 100-, and 500-years) and both with %

    Date published: January 1, 2019

    Projected flooding extents and depths based on 10-, 50-, 100-, and 500-year wave-energy return periods, with and without coral reefs, for the States of Hawaii and Florida, the Territories of Guam, American Samoa, Puerto Rico, and the U.S. Virgin Islands,

    This data release provides flooding extent polygons (flood masks) and depth values (flood points) based on wave-driven total water levels for 22 locations within the States of Hawaii and Florida, the Territories of Guam, American Samoa, Puerto Rico, and the U.S. Virgin Islands, and the Commonwealth of the Northern Mariana Islands. For each of the 22 locations there are eight ass

    Date published: January 1, 2018

    Habitat characterization around standard brown treesnake traps on Guam, 2004 - 2017

    Data were collected in association with locations of standard brown treesnake traps on Guam at location prior to suppression or control efforts and after control had occurred. In all cases study sites were closed or semi-closed populations of brown treesnakes. Habitat data focused on type and structure of the habitat within 10-m of the trap.

    Date published: October 18, 2017

    Dataset: Forest growth in and around an ungulate enclosure on Northern Guam, 2005-2011

    On an island largely devoid of native vertebrate seed dispersers, we monitored forest succession for seven years following ungulate exclusion from a 5-hectare area and adjacent plots with ungulates still present. 

    Date published: September 1, 2017

    National Water Information System web interface (NWISweb)

    The National Water Information System (NWIS) web application provides access to real-time and historical surface-water, groundwater, water-quality, and water-use data collected at approximately 1.5 million sites across all 50 states.

    Date published: January 1, 2017

    Dataset: Forest growth in and around an ungulate enclosure on Northern Guam, 2005-2011

    On an island largely devoid of native vertebrate seed dispersers, we monitored forest succession for seven years following ungulate exclusion from a 5-hectare area and adjacent plots with ungulates still present. The study site was in northern Guam on Andersen Air Force Base (13°37’N, 144°51’E) and situated on a coralline limestone plateau. We established 22 plot

    Date published: January 1, 2017

    Southern Guam watershed model, PRMS_2016

    The PRMS_2016 folder contains the input files needed to run each of the modeled regions in southern Guam, the calibration data files, and a README_PRMS_2016.txt document that describes the contents of this archive and the execution of the model batch files.

    Date published: January 1, 2017

    Hydrologic Response Units (HRUs) for the Southern Guam watershed model, PRMS_2016

    The hydrologic response units (HRUs) available here were used in the Precipitation Runoff Modeling System (PRMS) of southern Guam documented by Rosa and Hay (2017). A Geographic Information System (GIS) file for the HRUs is provided as a shapefile with attributes ParentHRU, Region, and RegionHRU identifying the numbering convention used in the PRMS_2016 southern Guam model par

    Filter Total Items: 2
    Filter Total Items: 12
    Scientist holding brown treesnake
    October 21, 2020

    Scientist holding brown treesnake

    A USGS scientist holds an invasive brown treesnake.

    January 6, 2020

    How Our Reefs Protect Us: Valuing the Benefits of U.S. Reefs

    The degradation of coastal habitats, particularly coral reefs, raises risks by increasing the exposure of coastal communities to flooding hazards during storms. The protective services of these natural defenses are not assessed in the same rigorous economic terms as artificial defenses, such as seawalls, and therefore often are not considered in decision-making. Here we

    Aerial imagery of islands are marked to show different data about each island's coast.
    January 1, 2020

    Guam and CNMI Coral Reefs and Coastal Hazard Risk Reduction

    Rigorously Valuing the Role of Guam’s Coral Reefs and the Commonwealth of the Northern Mariana Islands’s Coral Reefs in Coastal Hazard Risk Reduction

    Estimated Annual Benefits

    Maps of Guam and the the Commonwealth of the Northern Mariana Islands showing the distribution of the value of averted direct building damages, indirect economic activity losses, and

    ...
    December 8, 2019

    How Our Reefs Protect Us: Valuing the Benefits of U.S. Reefs (AD)

    The degradation of coastal habitats, particularly coral reefs, raises risks by increasing the exposure of coastal communities to flooding hazards during storms. The protective services of these natural defenses are not assessed in the same rigorous economic terms as artificial defenses, such as seawalls, and therefore often are not considered in decision-making. Here we

    USGS
    April 8, 2020

    Aggregates Data by State, Type, and End Use; 1971–2016

    This data set contains supplemental aggregates data for the USGS Minerals Yearbook Volume II—Area Reports: Domestic. It contains data for the years 1971 through 2016 and replaces the discrete construction aggregate tables that were included in the individual State chapters prior to 2014. It contains

    Filter Total Items: 27
    Invasive brown treesnake
    November 5, 2020

    For the first time, an invasive brown treesnake population has been found on Cocos Island, an 83.1 acre atoll located 1.5 miles off the southwest coast of Guam.  

    Dragonfly larvae being held in an open hand
    July 21, 2020

    A team of federal, academic, and NGO researchers conducted a national-scale assessment of mercury bioaccumulation in aquatic ecosystems using dragonfly larvae as biosentinels.

    Brown treesnake
    May 22, 2020

    On May 14, Director Reilly signed a Memorandum of Agreement with the Department of the Navy and the U.S. Fish and Wildlife Service. The MOA provides for continuity of operations for the USFWS and the USGS with construction of new office and lab facilities on the Guam National Wildlife Refuge in conjunction with DOD’s construction of a Marine Corps firing range.

    Simulated change in rainfall on Guam
    October 7, 2019

    Guam’s water demands are anticipated to increase. Potential impacts of sea-level rise and a changing climate on surface-water and groundwater resources are assessed. 

    Close up photo of juvenile brown treesnake on branch.
    March 3, 2016

    Two recent reports of two brown treesnakes on Saipan is prompting federal and state officials to urge citizens of Hawaii, Guam and other Pacific Islands to report any sightings of these invasive snakes to authorities. Snakes can be reported by calling (671) 777-HISS or (670) 28-SNAKE.

    USGS science for a changing world logo
    October 1, 2015

    SANTA CRUZ, Calif. — A new study shows that the combined effect of storm-induced wave-driven flooding and sea level rise on island atolls may be more severe and happen sooner than previous estimates of inundation predicted by passive “bathtub” modeling for low-lying atoll islands, and especially at higher sea levels forecasted for the future due to climate change.

    Image: Severe Coastal Erosion During an El Niño Storm
    September 21, 2015

    SANTA CRUZ, Calif. — The projected upsurge of severe El Niño and La Niña events will cause an increase in storm events leading to extreme coastal flooding and erosion in populated regions across the Pacific Ocean, according to a multi-agency study published today in Nature Geoscience.

    Filter Total Items: 10