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.
HIGHLIGHTS
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Monitoring a Shifting Earth ... In Seattle
September 01, 2018
The UNAVCO interactive science exhibit, Monitoring a Shifting Earth, is now on display at the Pacific Science Center in Seattle, Washington. PSC receives more than 1 million visitors a year; a significant portion of these visitors are expected to also view the UNAVCO exhibit. This exhibit raises public awareness about earthquake and tsunami hazards of the Pacific Northwest and the geodetic technologies used to measure and monitor them.
Data Event Response to the August 21, 2018 M7.3 Earthquake, 30km NE of Rio Caribe, Venezuela
August 30, 2018
UNAVCO downloaded high-rate 1-sps (1 Hz) data from 6 GPS/GNSS stations operated by UNAVCO within ~500 km of the epicenter from a 2-day time window around the event (± 1 day).
Data Event Response to the August 19, 2018 M 8.2 Earthquake 280km NNE of Ndoi Island, Fiji
August 22, 2018
UNAVCO has produced a fully processed 1-sps borehole strainmeter (BSM) dataset spanning the time period of this event, available from the PBO borehole strainmeter event response page.
Data Event Response to the August 12, 2018 M 6.4 Earthquake 84km SW of Kaktovik, Alaska
August 13, 2018
UNAVCO is downloading high-rate 1-sps (1 Hz) data from 9 GPS/GNSS stations operated by UNAVCO within ~600 km of the epicenter for a 6-hour time window around the event (± 3 hours). A map of downloaded stations is shown. These data are available from the UNAVCO high rate data ftp site.
SCIENCE SNAPSHOTS
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Probabilities of Large Earthquakes in Alaska
February 28, 2018
A crustal deformation model for the Western United States fits geodetic and geologic observations and shows where major changes in the crust are occurring. Such modeling is critical for earthquake hazard assessments and for understanding Earth processes.
Finding Faults with Geodetic and Geologic Data: Deformation Model for the Western U.S.
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.
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.
Sea Ice! Yes, You Can Measure That With GNSS
July 31, 2018
Ground-based GNSS sites can measure the extent of sea ice. The method relies on measuring the signal to noise ratio of the satellite signal that reflects off of the ice. A single GNSS site, GTGU, situated on the coast of a bay at the Onsala Space Observatory, Sweden, measured sea ice extent over a three-year period.
Measuring Vegetation Health Through a California Drought with Geodetic Techniques
August 8, 2018
The health of wild vegetation during the California drought of 2012 to 2014 was measured with microwave-wavelength reflected Global Positioning System (GPS) measurements from hundreds of sites that are part of the EarthScope Plate Boundary Observatory. The geodetic data is compared to optical-wavelength measurements at collocated sites. The observations and comparisons show that three years of drought stunted growth and reduced the growing season with the late precipitation in the third year of the drought being particularly devastating to vegetation. These methods can help gauge future conditions and inform environmental impacts on humans and nature.
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.
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.
Last modified: Thursday, 30-Aug-2018 21:15:19 UTC
2018