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Transforming understanding of Earth systems and hazards using geodesy.

 
 

HIGHLIGHTS

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The NASA Space Geodesy Project - An Update

The NASA Space Geodesy Project - An Update

February 12, 2018

NASA’s Space Geodesy Project (SGP) was initiated in order to develop and maintain a global network of next-generation space geodetic observing instruments. Core sites around the globe will use three or four of the primary space-geodetic techniques: Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS), and the Global Navigation Satellite System (GNSS)

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Data Event Response to the February 16, 2018 M7.2 Earthquake 37km NE of Pinotepa, Mexico

Data Event Response to the February 16, 2018 M7.2 Earthquake 37km NE of Pinotepa, Mexico

February 21, 2018

Signals from this event were recorded by 23 GPS/GNSS stations operated by UNAVCO, UNAM and collaborators that were streaming high rate (1-sps / 1 Hz) data in real time (Figures 2 and 3). These data allowed peak ground displacements (PGD) to be calculated automatically from the displacement traces within seconds of the earthquake. Note: figures and findings are preliminary and subject to revision.

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Data Event Response to the January 23, 2018 M 7.9 Earthquake 280km SE of Kodiak, Alaska

Data Event Response to the January 23, 2018 M 7.9 Earthquake 280km SE of Kodiak, Alaska

January 23, 2018

Signals from this event were recorded by 16 UNAVCO GPS stations that were streaming high rate (1-sps / 1 Hz) data in real time (Figures 3 and 4). These data allowed peak ground displacements (PGD) to be calculated automatically from the displacement traces within seconds of the earthquake (Figure 3), with a magnitude derived from inverting the PGDs of M7.8. Note: figures and findings are preliminary and subject to revision.

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Data Event Response to the January 10, 2018 M 7.5 Earthquake 44km E of Great Swan Island, Honduras

Data Event Response to the January 10, 2018 M 7.5 Earthquake 44km E of Great Swan Island, Honduras

January 22, 2018

UNAVCO downloaded high-rate 1-sps (1 Hz) and 5-sps (5 Hz) GPS/GNSS data from 18 stations and 1-sps (1 Hz) data only from an additional three stations in response to the M7.5 earthquake 44km E of Great Swan Island, Honduras, on 2017-01-10.

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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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Using GPS/GNSS for Near Real-Time Earthquake Monitoring

Using GPS/GNSS for Near Real-Time Earthquake Monitoring

November 3, 2017

Analysis of past earthquakes shows that GPS/GNSS sites can provide high-rate, low-noise data to determine peak ground velocities for earthquakes of magnitude greater than 5.8. The geodetic-derived ground motion can help with earthquake early warning, emergency response and earthquake engineering.

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Looking for Dark Matter Passing Through the GPS Constellation

Looking for Dark Matter Passing Through the GPS Constellation

November 21, 2017

The Global Positioning System (GPS) constellation can be used to detect dark matter. Sixteen years of ground-based GPS receiver observations were utilized to look for dark matter passing near Earth. Although no dark matter was detected, the results refine the properties of the universe, the accuracies of atomic clocks and future searches for dark matter.

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Following Solitary Waves in a Greenland Glacier with Geodesy

Following Solitary Waves in a Greenland Glacier with Geodesy

July 11, 2017

Greenland’s ice and snow mass has been melting at an accelerated rate for many years. A network of GNSS sites, set-up on coastal bedrock, has been utilized to measure a huge outflow of ice and water in 2012 and 2010 from the Rink Glacier. The horizontal motion at the GNSS site captures a solitary mass transport wave traveling coastward down the glacier in the summers of those two melt years.

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Seasonal Water Load Changes Can Trigger Earthquakes in California

Seasonal Water Load Changes Can Trigger Earthquakes in California

September 18, 2017

GPS sites in California measure the changing water load due to rainfall, snowfall, groundwater, and drought. The recorded small vertical motions are shown to influence the state of stress on shallow faults. An analysis of fault failure conditions indicate that the rise and fall of the surface due to water loading and unloading creates a small amount of additional stress on the faults and can trigger small earthquakes.

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Tsunami Hazards in Central America

Tsunami Hazards in Central America

November 8, 2017

Central America faces tsunami threats along the Pacific and Caribbean coasts and at the shores of large lakes. Large earthquakes caused the most damaging tsunamis, however, landslides or volcanic eruptions can cause tsunamis around large lakes. Warning systems rely on seismic and geodetic observations. The Central American Tsunami Advisory Center (CATAC) will use these observations to help reduce losses.

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Testing Geodetic Observations for Earthquake Early Warning in Alaska

Testing Geodetic Observations for Earthquake Early Warning in Alaska

August 31, 2017

An analysis of the 2016 Iniskin earthquake shows how GPS sites in Alaska may augment earthquake early warning. For a large magnitude earthquake that originates at a shallow depth, information from GPS can provide some warning before the shaking arrives in populated areas such as Anchorage. The geodetic data can rapidly and precisely define the earthquake properties to help with response and triggered hazards such as landslides and tsunamis.

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Last modified: Friday, 23-Feb-2018 18:57:42 UTC

 

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