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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Data Event Response to the July 4, 2019 M 6.4 and July 6, 2019 M 7.1 Earthquakes Near Ridgecrest, California
July 5, 2019
Signals from this event were recorded by 12 GPS/GNSS stations within 71 km of the epicenter operated by UNAVCO that were streaming high rate (1-sps / 1 Hz) data in real time (Figure 2). These data allowed peak ground displacements (PGD) to be calculated automatically from the displacement traces within seconds of the earthquake (Figures 3 and 4).
Data Event Response to the June 26, 2019 M6.2 Earthquake 5km SE of Aserrio de Gariche, Panama
June 27, 2019
UNAVCO is downloading high-rate 1-sps (1 Hz) data from the few NOTA GPS/GNSS stations near the epicenter of this event. In addition, 5-sps (5 Hz) data are being downloaded from available sites. Due to the remote locations and limited comms of these sites, data will take longer than usual to be acquired. A station map is shown in Figure 2; this map will be updated after data are acquired. When downloaded, these data are available from the UNAVCO high rate data ftp site.
The Myrtle Grove Subsidence Superstation
May 28, 2019
How do you install a GPS station in a marsh? How about three all in the same place? Installation of the Myrtle Grove subsidence superstation began in August 2016, but planning began well beforehand. The array of three co-located stations in Myrtle Grove, Louisiana, posed particular challenges, as the instruments were installed in a coastal marsh—in which the installation team would sink up to their hips in mud and water.
Celebrating 15 Years of Discovery and the Legacy of a Major Science Initiative: The EarthScope Finale Science Symposium and Reception
May 23, 2019
Scientists, community members, National Science Foundation (NSF) staff and representatives of federal agencies gathered in Washington, D.C. May 21-22 to celebrate the successes of EarthScope. EarthScope was an NSF program designed to study the structure and evolution of the North American continent and the processes that cause earthquakes and volcanic eruptions.
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.
Not All Earthquakes Are the Same: Geodetic Data Quick to Define Magnitude
May 31, 2019
Analysis of source time functions and geodetic data show that within the first 20 seconds of a magnitude 7+ earthquake, the magnitude can be determined base on the characteristics of the slip pulse. This is a change from previous work regarding determinism or self-similar models of earthquakes. Beyond understanding earthquakes better, the results can help to more quickly determine the size of the event and help with preparedness, response and mitigation.
Tracking Interactions of the Sun, the Moon and Earth with GNSS for the 2017 Great American Solar Eclipse
March 03, 2019
he 21 August 2017 total solar eclipse across the United States blocked solar radiation and influenced the ionosphere and the rest of the atmosphere. The total electron content (TEC) in the ionosphere was measured with UNAVCO’s network of U.S. Global Positioning System (GPS)/ Global Navigation Satellite System (GNSS) ground-based sites and other geodetic sites across the country.
Measuring Permafrost on the North Slope of Alaska with GNSS
January 18, 2019
The freeze-thaw dynamics of permafrost on the north slope of Alaska was measured over 12 years using a Global Navigation Satellite System (GNSS) site permanently embedded in the permafrost near Barrow, Alaska. The data reveal subsidence due to thawing each summer plus interannual variations. The technique provides a new spatial and temporal approach to quantify permafrost changes and it can be applied at more than 200 GNSS sites in cold regions.
How Flood and Fire Alter Landscape, Seen Through the Discerning Eye of Ground-based LIDAR
February 7, 2019
A colluvial hollow in Fourmile Canyon, Colorado that was present after the 2010 Fourmile Canyon wildfire transitioned to a fluvial channel with steps and pools while retaining the original hollow roughness after an intense 2013 flood. The changes were measured with a terrestrial laser scanner from UNAVCO and can help understand future risks in a changing landscape.
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.
Chile Advances Earthquake and Tsunami Warning System with GNSS Data
April 08, 2019
Global Navigation Satellite Systems (GNSS) networks have been established and enhanced to provide information and warning about large earthquakes and tsunamis. The Centro Sismológico Nacional (CSN) of the Universidad de Chile can collect information about an earthquake and potential tsunami from GNSS data within seconds and provide early warning to communities in Chile and the rest of the world.
Last modified: Sunday, 07-Jul-2019 16:36:00 UTC
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