Regions

Guam

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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: May 31, 2016

New Science Challenges Old Assumptions about Harmful Algal Blooms

First-of-its-kind survey shows that algal toxins are found nationwide

Date published: March 3, 2016

Brown Treesnake Rapid Response Team Deployed to Saipan after Two Snake Sightings

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.

Date published: December 1, 2015

New Remote Sensing Handbook Published

A newly published, three-volume “Remote Sensing Handbook” is a comprehensive coverage of all remote sensing topics written by over 300 leading global experts.

Filter Total Items: 29
Aerial photograph of Wake Island. The deep ocean water around the atoll is dark blue, the shallow lagoon water is light blue.
Date Published: July 15, 2019
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.

Contacts: Curt Storlazzi
Camera was positioned halfway in and out of water to show a coastal bluff with vegetation in background, coral reef underwater.
Date Published: July 15, 2019
Status: Active

Sea-Level Rise and Climate Change Impacts to Reefs

This study is part of the USGS Coral Reef Project.

Contacts: Curt Storlazzi
Underwater view of tropical fish swimming in shallow water above a coral reef which reflects upward to the water surface.
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.

Contacts: Curt Storlazzi
Coral head that looks like lettuce sits on sandy bottom in clear blue water and is surrounded by brightly colored fish.
Date Published: July 15, 2019
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.

Contacts: Curt Storlazzi
USGS
Date Published: June 26, 2019
Status: Active

Information by Region-Guam and Northern Marianas

  

Application to explore US Oil and Gas Assessments
Date Published: April 19, 2019
Status: Active

United States Assessments of Undiscovered Oil and Gas Resources

USGS Energy Resources Program provides periodic assessments of the oil and natural gas endowment of the United States and the World (click here for information about World Oil and Gas Assessments).  This website provides access to new, prioritized, assessment results and supporting data for the United States, as part...

USGS biologists sample fish and macroinvertebrates from Streams in Palau
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. 

Satellite image of an island showing its terrain, some land features like runways and towns, and the bright shallow waters.
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

coral reef
Date Published: November 5, 2018
Status: Active

Coral Reef Facts

These facts about coral reefs are presented in conjunction with the USGS Coral Reef Project.

Contacts: Curt Storlazzi
Department of Interior U.S.G.S Guam Magnetic Observatory sign
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) ...

Photo of Bird Bands in a Variety of Sizes and Types
Date Published: May 1, 2018
Status: Active

Bird Banding Laboratory

The Bird Banding Laboratory (BBL) is an integrated scientific program established in 1920 supporting the collection, archiving, management and dissemination of information from banded and marked birds in North America.  This information is used to monitor the status and trends of resident and migratory bird populations. Because birds are good indicators of the health of the environment, the...

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NWIS Mapper screenshot
March 5, 2019

The NWIS mapper provides access to over 1.5 million sites contained in the USGS National Water Information System (NWIS), including sites where current and historical surface-water, groundwater, springs, and atmospheric data has been collected. Users can search by site type, data type, site number, or place.

USGS
January 1, 2019

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 return periods (r

USGS
January 1, 2019

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 each of four nearshore wave

USGS
January 1, 2019

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 (wrf) and without (worf

Map of the Pacific Ocean and surrounding continents with boxes drawn around areas to show study locations.
January 1, 2019

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 associated flood mask

USGS
January 1, 2018

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.

USGS science for a changing world
October 18, 2017

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. 

Application screenshot thumbnail
September 1, 2017

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.

USGS
January 1, 2017

The stream segments 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 stream segments is provided as a shapefile with attributes ParentSeg, Region, and RegionSeg identifying the numbering convention used in the PRMS_2016 southern Guam model parameter files and Rosa and

USGS
January 1, 2017

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 parameter files and Ros

USGS
January 1, 2017

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.

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Application to explore US Oil and Gas Assessments
March 19, 2019

This map shows the provinces assessed by the USGS for undiscovered oil and gas resources. 

Digital Elevation Model in the Atchafalaya Basin, LA
April 19, 2016

The 3DEP products and services available through The National Map consist of standard digital elevation models (DEMs) at various horizontal resolutions, elevation source and associated datasets, an elevation point query service and bulk point query service. All 3DEP products are available, free of charge and without use restrictions.

Filter Total Items: 14
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Year Published: 2019

Rigorously valuing the role of U.S. coral reefs in coastal hazard risk reduction

The degradation of coastal habitats, particularly coral reefs, raises risks by increasing the exposure of coastal communities to flooding hazards. 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...

Storlazzi, Curt D.; Reguero, Borja G.; Cole, Aaron D.; Lowe, Erik; Shope, James B.; Gibbs, Ann E.; Nickel, Barry A.; McCall, Robert T.; van Dongeren, Ap R.; Beck, Michael W.
Storlazzi, C.D., Reguero, B.G., Cole, A.D., Lowe, E., Shope, J.B., Gibbs, A.E., Nickel, B.A., McCall, R.T., van Dongeren, A.R., and Beck, M.W., 2019, Rigorously valuing the role of U.S. coral reefs in coastal hazard risk reduction: U.S. Geological Survey Open-File Report 2019–1027, 42 p., https://doi.org/10.3133/ofr20191027.

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Year Published: 2019

Tropical cyclone projections: Changing climate threats for Pacific Island defense installations

Potential changing climate threats in the tropical and subtropical North Pacific Ocean were assessed, using coupled ocean-atmosphere and atmosphere-only general circulation models, to explore their response to projected increasing greenhouse gas emissions. Tropical cyclone occurrence, described by their frequency and intensity, near islands...

Widlansky, Matthew J.; Annamalai, Hariharasubramanian; Gingerich, Stephen B.; Storlazzi, Curt D.; Marra, John J.; Hodges, Kevin I.; Choy, Barry; Kitoh, Akio

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Year Published: 2015

Storage capacity of the Fena Valley Reservoir, Guam, Mariana Islands, 2014

The Fena Valley Reservoir is in southern Guam and is the primary source of water for the U.S. Naval Base Guam and nearby village residents. Since the construction of the Fena Dam in 1951, sediment has accumulated in the reservoir and reduced its storage capacity. The reservoir was surveyed previously in 1973, 1979, and 1990 to estimate the loss in...

Marineau, Mathieu D.; Wright, Scott A.
Marineau, M.D., and Wright, S.A, 2015, Storage capacity of the Fena Valley Reservoir, Guam, Mariana Islands, 2014: U.S. Geological Survey Scientific Investigations Report 2015–5128, 31 p., http://dx.doi.org/10.3133/sir20155128.

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Year Published: 2015

Climate trends and projections for Guam

The island of Guam experiences a tropical marine climate, which is warm and humid moderated by seasonal tradewinds and a wet and dry season. The dry season lasts from January to June, while the rainy months are from July to December. Annual rainfall totals 84-116 inches (2133-2946 mm), of which two-thirds fall during the rainy season. Seasonal...

Gingerich, Stephen B.; Keener, Victoria; Finucane, Melissa L.

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Year Published: 2013

The effects of withdrawals and drought on groundwater availability in the Northern Guam Lens Aquifer, Guam

Owing to population growth, freshwater demand on Guam has increased in the past and will likely increase in the future. During the early 1970s to 2010, groundwater withdrawals from the limestone Northern Guam Lens Aquifer, the main source of freshwater on the island, tripled from about 15 to 45 million gallons per day. Because of proposed military...

Gingerich, Stephen B.
The effects of withdrawals and drought on groundwater availability in the Northern Guam Lens Aquifer, Guam; 2013; SIR; 2013-5216; Gingerich, Stephen B.

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Year Published: 2013

Estimating hydraulic properties from tidal attenuation in the Northern Guam Lens Aquifer, territory of Guam, USA

Tidal-signal attenuations are analyzed to compute hydraulic diffusivities and estimate regional hydraulic conductivities of the Northern Guam Lens Aquifer, Territory of Guam (Pacific Ocean), USA. The results indicate a significant tidal-damping effect at the coastal boundary. Hydraulic diffusivities computed using a simple analytical solution for...

Rotzoll, Kolja; Gingerich, Stephen B.; Jenson, John W.; El-Kadi, Aly I.
Estimating hydraulic properties from tidal attenuation in the Northern Guam Lens Aquifer, territory of Guam, USA; 2013; Article; Journal; Hydrogeology Journal; Rotzoll, Kolja ; Gingerich, Stephen B.; Jenson, John W.; El-Kadi, Aly I.

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Year Published: 2013

Freshwater and drought on Pacific Islands

Izuka, Scot K.; Keener, Victoria
Freshwater and drought on Pacific Islands; 2013; Book chapter; Book; Climate Change and Pacific Islands: Indicators and Impacts: Report for the 2012 Pacific Islands Regional Climate Assessment; Scot K Izuka; Keener, Victoria

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Year Published: 2012

Seismic hazard assessment for Guam and the Northern Mariana Islands

We present the results of a new probabilistic seismic hazard assessment for Guam and the Northern Mariana Islands. The Mariana island arc has formed in response to northwestward subduction of the Pacific plate beneath the Philippine Sea plate, and this process controls seismic activity in the region. Historical seismicity, the Mariana megathrust,...

Mueller, Charles S.; Haller, Kathleen M.; Luco, Nicholas; Petersen, Mark D.; Frankel, Arthur D.
Seismic hazard assessment for Guam and the Northern Mariana Islands; 2012; OFR; 2012-1015; Mueller, Charles S.; Haller, Kathleen M.; Luco, Nicholas ; Petersen, Mark D.; Frankel, Arthur D.

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Year Published: 2012

A water-budget model and estimates of groundwater recharge for Guam

On Guam, demand for groundwater tripled from the early 1970s to 2010. The demand for groundwater is anticipated to further increase in the near future because of population growth and a proposed military relocation to Guam. Uncertainty regarding the availability of groundwater resources to support the increased demand has prompted an investigation...

Johnson, Adam G.
A water-budget model and estimates of groundwater recharge for Guam; 2012; SIR; 2012-5028; Johnson, Adam G.

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Year Published: 2010

Groundwater availability study for Guam; goals, approach, products, and schedule of activities

An expected significant population increase on Guam has raised concern about the sustainability of groundwater resources. In response, the U.S. Geological Survey (USGS), in collaboration with the University of Guam's Water and Environmental Research Institute of the Western Pacific (WERI) and with funding from the U.S. Marine Corps (USMC), is...

Gingerich, Stephen B.; Jenson, John W.
Groundwater availability study for Guam; goals, approach, products, and schedule of activities; 2010; FS; 2010-3084; Gingerich, Stephen B.; Jenson, John W.

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Year Published: 2008

Ground Water on Tropical Pacific Islands - Understanding a Vital Resource

To a casual observer, tropical Pacific islands seem idyllic. Closer scrutiny reveals that their generally small size makes them particularly vulnerable to economic and environmental stresses imposed by rapidly growing populations, increasing economic development, and global climate change. On these islands, freshwater is one of the most precious...

Tribble, Gordon
Ground Water on Tropical Pacific Islands - Understanding a Vital Resource; 2008; CIR; 1312; Tribble, Gordon

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Year Published: 2005

Rainfall-Runoff and Water-Balance Models for Management of the Fena Valley Reservoir, Guam

The U.S. Geological Survey's Precipitation-Runoff Modeling System (PRMS) and a generalized water-balance model were calibrated and verified for use in estimating future availability of water in the Fena Valley Reservoir in response to various combinations of water withdrawal rates and rainfall conditions. Application of PRMS provides a physically...

Yeung, Chiu W.
Rainfall-Runoff and Water-Balance Models for Management of the Fena Valley Reservoir, Guam; 2005; SIR; 2004-5287; Yeung, Chiu W.

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Satellite image of an island showing its terrain, some land features like runways and towns, and the bright shallow waters.
December 30, 2011

Guam satellite image

Satellite photo of Guam from NASA’s Earth Observing-1 (EO-1) satellite's Advanced Land Imager.

Image: Guam Geomagnetic Observatory
August 8, 2011

Guam Geomagnetic Observatory

Guam geomagnetic observatory.

Attribution: Geomagnetism
Guam magnetic observatory, image of the area
August 8, 2011

Geomagnetism Guam

Guam magnetic observatory.

A brown treesnake on frangipangi blossoms, by Bjorn Lardner, USGS.
January 1, 2011

A brown treesnake on frangipangi blossoms

A brown treesnake crawls on some frangipangi blossoms in Guam. 

Department of Interior U.S.G.S Guam Magnetic Observatory sign
December 31, 2010

Geomagnetism Guam

The Department of Interior U.S.G.S. Guam Magnetic Observatory sign.

Variations building at Guam.
November 16, 2010

Geomagnetism Guam

Variations building at Guam. 

A brown treesnake in a tree in Guam. Photo by Bob Reed, USGS.
December 31, 2009

A brown treesnake in a tree in Guam.

This is an image of a brown treesnake in a tree in Guam, taken in 2009.

A brown treesnake in a tree in Guam. Photo by Bob Reed, USGS, 2009.
December 31, 2009

A brown treesnake in a tree in Guam.

A brown treesnake in a tree in Guam. Photo by Bob Reed, USGS, 2009.

Underwater view of tropical fish swimming in shallow water above a coral reef which reflects upward to the water surface.
February 3, 2008

Fish and coral in Tumon Bay Marine Reserve, Guam

Underwater photograph of Tumon Bay Marine Reserve, Guam, showing some of the amazing diversity of coral reefs.

Image: Guam Geomagnetic Observatory

Guam Geomagnetic Observatory

Variations building at Guam geomagnetic observatory.

Attribution: Geomagnetism
Image: Guam Geomagnetic Observatory

Guam Geomagnetic Observatory

Nema box at Guam geomagnetic observatory.

Attribution: Geomagnetism
Image: Guam Geomagnetic Observatory

Guam Geomagnetic Observatory

Kat Uchima at Guam geomagnetic observatory.

Attribution: Geomagnetism
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Map of the 48 contiguous states showing Microcystin concentrations
May 31, 2016

First-of-its-kind survey shows that algal toxins are found nationwide

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
December 1, 2015

A newly published, three-volume “Remote Sensing Handbook” is a comprehensive coverage of all remote sensing topics written by over 300 leading global experts.

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:  Black-footed Albatross with Chick
September 23, 2015

Islands used by tropical seabirds are highly vulnerable to sea level rise according to a new study released today.

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.

Crowdsourced Earthquake Warnings illustration
April 10, 2015

MENLO PARK, Calif.— Smartphones and other personal electronic devices could, in regions where they are in widespread use, function as early warning systems for large earthquakes according to newly reported research.

Crowdsourced Earthquake Warnings illustration
April 10, 2015

MENLO PARK, California — Los teléfonos móviles y otros dispositivos electrónicos personales podrían ayudar en las regiones donde se encuentran en uso generalizado, y pueden funcionar como sistemas de alerta para terremotos mayor según la nueva investigación científica recien publicada.

USGS
January 23, 2015

The U.S. Geological Survey Earthquake Program will be hosting an annual workshop to facilitate communication and research collaboration among scientists from the USGS and other institutions studying earthquakes in northern California. 

USGS
December 18, 2014

Secretary of the Interior Sally Jewell announced today that Interior’s Pacific Islands Climate Science Center is awarding over $600,000 to universities and other partners for research to guide managers of parks, refuges and other cultural and natural resources in planning how to help communities, species and ecosystems adapt to climate change.

USGS
May 13, 2014

Stronger storms, rising seas, and flooding are placing hundreds of millions people at risk around the world, and big part of the solution to decrease those risks is just off shore. A new study finds that coral reefs reduce the wave energy that would otherwise impact coastlines by 97 percent.

USGS
December 20, 2013

David Helweg has been selected as the first permanent director of the U.S. Department of the Interior'sPacific Islands Climate Science Center, headquartered at the University of Hawai'i, Manoa.

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