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Transforming understanding of Earth systems and hazards using geodesy.

 
 

HIGHLIGHTS

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Join UNAVCO at SSA

Join UNAVCO at SSA

March 25, 2017

UNAVCO will be hosting a booth at the 2017 annual meeting of the Seismological Society of America (SSA). Stop by the booth, and keep up with UNAVCO through our staff presentations in the technical sessions.

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The NASA Space Geodesy Project – A Next-Generation Space Geodetic Observing Network

The NASA Space Geodesy Project – A Next-Generation Space Geodetic Observing Network

February 15, 2017

NASA’s Space Geodesy Project (SGP) was initiated in order to develop and maintain a global network of next-generation space geodetic observing instruments. The network will be comprised of core sites around the globe that utilize four primary space-geodetic techniques.

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P278 – Steel Was All That Remained

P278 – Steel Was All That Remained

February 17, 2017

In August and September of 2016, the Chimney Fire burned through 46,000 acres of San Luis Obisbo County near the central California coast. In addition to destroying dozens of homes and structures, the fire also swept over P278 Clarke Mountain, a GNSS station located on a high ridge within the burn zone.

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Designing a Power System for Radars in Greenland

Designing a Power System for Radars in Greenland

February 17, 2017

The UNAVCO polar services team developed a power system for three radar systems in Greenland for the summer of 2016. The radar was to scan, multiple times a day, the calving front of Jakobshavn glacier on the west coast of Greenland, near Ilulissat, and Helheim glacier on the east coast of Greenland, near Tasilaq.

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SCIENCE SNAPSHOTS

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Probabilities of Large Earthquakes in Alaska

Probabilities of Large Earthquakes in Alaska

August 11, 2016

Estimates of the probabilities of a magnitude greater than 9.0 earthquake for the Aleutian Islands are about 6.5 to 12 percent over the next 50 years. Such an event poses obvious earthquake and tsunami risks for Alaska and tsunami risks for western North America and Hawaii.

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Rapid Tremor Reversals Along Cascadia Subduction Zone From Borehole Strainmeter Observations

Rapid Tremor Reversals Along Cascadia Subduction Zone From Borehole Strainmeter Observations

February 28, 2017

Analysis of 35 rapid tremor reversals (RTRs) captured by two Plate Boundary Observatory borehole strainmeters near Vancouver Island, British Columbia shows these subevents have high slip rates and modest strain energy release. RTRs contribute a significant fraction of the slow slip moment.

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GPS Tracks Atmospheric Water Vapor That Fuels Storms

GPS Tracks Atmospheric Water Vapor That Fuels Storms

November 21, 2016

A network of GPS stations measures atmospheric water vapor over the continental United States with effective spatial and temporal resolution. The data tracks annual and seasonal moisture transport from the Gulf of Mexico into the Great Plains and the moisture variability related to the North American monsoon. These measurements are valuable for severe weather forecasts.

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GPS Measurements of Bedrock Uplift in Greenland Improve Ice Loss Estimates

GPS Measurements of Bedrock Uplift in Greenland Improve Ice Loss Estimates

October 28, 2016

Global Positioning System (GPS) measurements of the uplift of the ground surface beneath the Greenland ice sheet is critical to determining the amount of ice mass that has been lost since the Last Glacial Maximum (LGM). The GPS data show larger uplift rates than previously recognized and suggest that satellite studies have underestimated the ice mass loss by about 20 gigatons per year or about 1.5 meters of sea level rise since the LGM.

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Sea Level Rise on the U.S. Gulf Coast

Sea Level Rise on the U.S. Gulf Coast

February 6, 2013

The Mississippi Delta along the Gulf Coast of the United States is a major site of sediment deposition from the Mississippi River and conversely a major site of wetland loss from rising seas and subsidence. There is debate about how much and when the delta has risen or fallen due to deposition, subsidence, sea level change, and erosion.

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Subsiding Atlantic Coast Due to Geologic Adjustment and Groundwater Extraction

Subsiding Atlantic Coast Due to Geologic Adjustment and Groundwater Extraction

November 28, 2016

Long-term records from GPS stations along the Atlantic Coast of North America show long term subsidence due to geologic adjustments and short term subsidence due to human-related groundwater extraction. These measurements are critical for understanding water use, sediment structure and sea level rise. In particular, knowing the rate of subsidence or uplift along this populated coastal plain could help mitigate flooding and inform land use.

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Everything You Need to Know About GPS Data Analysis and Geodetic Products from the Plate Boundary Observatory and Related Networks

Everything You Need to Know About GPS Data Analysis and Geodetic Products from the Plate Boundary Observatory and Related Networks

March 14, 2017

If you want to know everything about the methods and data analysis centers for GPS networks in North America and the Caribbean, this is the review you should read. The review describes methods for determining position time series, velocities and other parameters from 2170 stations.

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Last modified: Thursday, 23-Mar-2017 18:10:58 UTC

 

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