U N A V C O , A N O N - P R O F I T U N I V E R S I T Y - G O V E R N E D C O N S O R T I U M , F A C I L I T A T E S G E O S C I E N C E R E S E A R C H A N D E D U C A T I O N U S I N G G E O D E S Y.
Transforming understanding of Earth systems and hazards using geodesy.
WHAT'S HOT
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UNAVCO UAS Completes Survey of Cryoconite Holes on Antarctic Glacier
June 23, 2017
Cryoconite holes are pockets of life completely encased in otherwise barren glacial ice. These features are formed from when dust blown onto a glacier melts a small, largely isolated hole that can function as its own tiny ecosystem. Unmanned Aircraft System (UAS) surveys will help to quantify the spatial distribution and size variability of cryocontie communities by collecting orthorectified imagery and feature mapping.
Learn About Data Access with UNAVCO’s New Video Series
May 10, 2017
To improve data discovery, we have produced a new video series guiding users through accessing each geodetic data type available through UNAVCO's Geodetic Data Services. The videos both provide a broad overview of data available via our archives and show new users specifically how to access each distinct data type.
Data Event Response to the May 12, 2017 M6.2 Earthquake, 79km SSW of Acajutla, El Salvador
May 12, 2017
In response to the M6.2 earthquake 79km SSW of Acajutla, El Salvador, on 2017-05-12, high-rate 1-sps (1 Hz) GPS/GNSS data are being downloaded from five COCONet stations within 500 km of the epicenter for a ±2-hour period around the event.
Data Event Response to the May 1, 2017 M6.2 Earthquake 88km WNW of Skagway, Alaska
May 5, 2017
In response to the Mw 6.2 earthquake 88 km WNW of Skagway, Alaska on 2017-05-01, high-rate 1-sps (1 Hz) GPS/GNSS data are being downloaded from four PBO stations near the epicenter for a 7-day period around the event (day of event ± 3 days).
SCIENCE SNAPSHOTS
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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.
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.
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.
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.
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.
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.
Satellite Imagery Tracks Subsidence and Risk at Mosul Dam
June 26, 2017
The Mosul Dam on the Tigris River in Iraq was built on weak rock that is dissolving due to water infiltration since it was built. Satellite imagery shows the dam subsiding over 6 years. The subsidence increases the risk of dam failure, which would affect more than a million people living nearby and everyone who relies on the dam for energy and water.
Last modified: Monday, 26-Jun-2017 23:31:46 UTC
2017