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Transforming understanding of Earth systems and hazards using geodesy.

 
 

HIGHLIGHTS

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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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Installation of CORS cGPS Station in Seward, Alaska

Installation of CORS cGPS Station in Seward, Alaska

January 26, 2017

The National Geodetic Survey (NGS), an office of NOAA's National Ocean Service, manages a network of Continuously Operating Reference Stations (CORS) that provide Global Navigation Satellite System (GNSS) data in support of positioning, meteorology, space weather, and geophysical applications throughout the United States, its territories, and several foreign countries (from https://www.ngs.noaa.gov/CORS/).

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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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Complex Slip Triggered by Complex Geology for 2014 South Napa Earthquake

Complex Slip Triggered by Complex Geology for 2014 South Napa Earthquake

December 7, 2016

Using GPS and Sentinel 1 radar imagery, the slip along the West Napa fault zone (WNFZ) during and after the 2014 South Napa earthquake was measured. The complexity of the slip and afterslip suggests that hard rock and soft sediment heterogeneity control the style of friction on the fault plane.

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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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Improving Local Tsunami Warnings by Combining Geodetic and Seismic Observations

Improving Local Tsunami Warnings by Combining Geodetic and Seismic Observations

November 29, 2016

Combining geodetic and seismic observations can reduce the amount of time needed to assess the tsunami intensity generated by a large magnitude thrust fault earthquake along a subduction zone. Through retrospective analysis of four tsunamigenic large earthquakes in Japan and Chile, the tsunami potential at the local coast was estimated within less than 2 minutes.

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Last modified: Thursday, 23-Feb-2017 19:16:02 UTC

 

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