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Transforming understanding of Earth systems and hazards using geodesy.

 
 

HIGHLIGHTS

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Data Event Response to the May 12, 2017 M6.2 Earthquake, 79km SSW of Acajutla, El Salvador

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.

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Data Event Response to the May 1, 2017 M6.2 Earthquake 88km WNW of Skagway, Alaska

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).

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Plate Boundary Observatory Watches Another Episodic Tremor and Slow Slip Event on the Cascadia Subduction Zone

Plate Boundary Observatory Watches Another Episodic Tremor and Slow Slip Event on the Cascadia Subduction Zone

May 4, 2017

An episodic tremor and slow slip (ETS) event is an episode over a discreet period of time of short bursts of seismic energy called tremor plus slow slip on the fault. The slip is so slow that it cannot be felt by humans and does not record the characteristic signature of an earthquake on a seismometer.

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Join UNAVCO at SSA

Join UNAVCO at SSA

March 25, 2017

UNAVCO will be hosting a booth at the 2017 annual meeting of the Seismological Society of America (SSA). Stop by the booth, and keep up with UNAVCO through our staff presentations in the technical sessions.

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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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Plate Boundary Observatory Strainmeter Data for Determining Earthquake Characteristics

Plate Boundary Observatory Strainmeter Data for Determining Earthquake Characteristics

May 23, 2017

An analysis of borehole strainmeter data from Plate Boundary Observatory sites in the western United States for 144 earthquakes from 2004 to 2014 reveals correlations between the peak strain from these events with distance from the hypocenter and the earthquake magnitude.

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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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GPS Measurements of Bedrock Uplift in Greenland Improve Ice Loss Estimates

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.

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Sea Level Rise on the U.S. Gulf Coast

Sea Level Rise on the U.S. Gulf Coast

February 6, 2013

The Mississippi Delta along the Gulf Coast of the United States is a major site of sediment deposition from the Mississippi River and conversely a major site of wetland loss from rising seas and subsidence. There is debate about how much and when the delta has risen or fallen due to deposition, subsidence, sea level change, and erosion.

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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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Everything You Need to Know About GPS Data Analysis and Geodetic Products from the Plate Boundary Observatory and Related Networks

Everything You Need to Know About GPS Data Analysis and Geodetic Products from the Plate Boundary Observatory and Related Networks

March 14, 2017

If you want to know everything about the methods and data analysis centers for GPS networks in North America and the Caribbean, this is the review you should read. The review describes methods for determining position time series, velocities and other parameters from 2170 stations.

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Last modified: Monday, 22-May-2017 16:54:34 UTC

 

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