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Transforming understanding of Earth systems and hazards using geodesy.

 
 

HIGHLIGHTS

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September 19, 2017 M7.1 Earthquake 5km ENE of Raboso, Mexico Data Event Response

September 19, 2017 M7.1 Earthquake 5km ENE of Raboso, Mexico Data Event Response

September 20, 2017

In response to the M7.1 earthquake 5km ENE of Raboso, Mexico on 2017-09-19 at 18:14:39 UTC, UNAVCO and UNAM-Geofisica have initiated the acquisition of high-rate (1 Hz and/or 5 Hz) GPS/GNSS data from stations within ~1000 km of the epicenter.

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September 8, 2017 M8.1 Earthquake 87km SW of Pijijiapan, Mexico Data Event Response

September 8, 2017 M8.1 Earthquake 87km SW of Pijijiapan, Mexico Data Event Response

September 8, 2017

In response to the M8.1 earthquake 87km SW of Pijijiapan, Mexico, on 2017-09-08, UNAVCO has initiated the acquisition of high-rate (1 Hz and/or 5 Hz) GPS/GNSS data from stations within ~1200 km of the epicenter.

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Hydrologic Surface Loading at GAGE GPS Stations

Hydrologic Surface Loading at GAGE GPS Stations

September 6, 2017

UNAVCO’s Geodetic Data Services (GDS) program is releasing new data products based on hydrologic surface loading at Plate Boundary Observatory (PBO) GNSS station sites. Using estimates of surface water mass from global and national land data assimilation systems (GLDAS and NLDAS, respectively, types of environmental models used in climate and weather models), UNAVCO models the expected displacement from these loads at GAGE-processed PBO stations.

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UNAVCO Collects High-Rate GPS Data During the 2017 Great American Solar Eclipse

UNAVCO Collects High-Rate GPS Data During the 2017 Great American Solar Eclipse

August 30, 2017

A solar eclipse was visible from most of North America on August 21, 2017, with the path of totality spanning from Oregon to South Carolina. UNAVCO collected high-rate 5Hz GPS data from a total of 279 EarthScope Plate Boundary Observatory (PBO) GNSS stations, 38 of which were within the path of totally with the rest within an approximately 300km-wide zone extending out to 90 of totality.

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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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Satellite Imagery Defines Characteristics of 2016 Ecuador Earthquake and Future Risks

Satellite Imagery Defines Characteristics of 2016 Ecuador Earthquake and Future Risks

June 15, 2017

A moment magnitude 7.8 earthquake ruptured a major subduction zone boundary between the Nazca and the South American plates just offshore of Ecuador on 16 April 2016. Synthetic aperture radar (SAR) data and model analysis show about 2.5 meters of slip at about 20 kilometers depth. The event implies shorter recurrence times for earthquakes in the region.

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Tracking Tsunami Waves in the Ionosphere with GPS Data Around Hawaii

Tracking Tsunami Waves in the Ionosphere with GPS Data Around Hawaii

May 18, 2017

A new method to compute total electron content (TEC) in the ionosphere to measure perturbations caused by tsunami waves has been shown to work retrospectively for tracking tsunami waves around Hawaii from the 2012 Haida Gwaii, British Columbia M7.8 earthquake.

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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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Groundwater Extraction During Drought in the Central Valley Reduces Future Storage Capacity

Groundwater Extraction During Drought in the Central Valley Reduces Future Storage Capacity

June 12, 2013

Groundwater withdrawal during the 2007 to 2010 drought in the San Joaquin Valley in California caused a great deal of subsidence. Geodetic, water level and geologic data were used to determine the amount of inelastic deformation. The results suggest that most of the deformation was inelastic during the drought and thus the volume of the aquifer has been reduced, leaving less storage capacity for water in the future.

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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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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: Wednesday, 20-Sep-2017 20:52:32 UTC

 

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