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Tales from the Field: PBO Installation in Alaska


Max Enders - Spring 2012

When UNAVCO set about building the Earthscope Plate Boundary Observatory (PBO) no challenge was nearly as daunting as the prospect of installing…

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EarthScope Social Media Blitz


By ESNO - Spring 2012

Social media sites have emerged as a popular and effective form of communication among all age groups, with more than half of the teenage and adult…

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Spring 2012 Facilities Status


Spring 2012

USArray Status

The Transportable Array (TA) continues to roll eastward across the US. Having crossed the Mississippi River in March 2011, the TA will…

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EarthScope Participates in Open Data Seismic Deployment Following 2010 Chile Earthquake


The global seismology community established a new model of international cooperation in response to the great Chile earthquake of February 27, 2010. The adaptable framework is geared to produce a high-quality, open-access data set of seismic waveforms col
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Seismic Tomography with USArray Data


In its July 2011 issue, Popular Science ranked EarthScope the “most epic” big science project because of its ambitious scope: Exploration of the deep geologic structure and evolution of an entire continent.
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Fluid Pressure Spikes in SAFOD Rocks as Evidence of Microseismicity


The San Andreas Fault (SAF) deforms by permanent creep and microseismicity in central California. Higher-thanhydrostatic fluid pressures, which could explain low strength and creep, were not detected during the San Andreas Fault Observatory at Depth (SAFO
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Using GPS to Measure Soil Moisture, Snow Depth and Vegetation Growth


GPS data collected as part of PBO, though, contain additional information that is very useful in ways unforeseen when the original PBO science plan was created.
Strain rate, which is typically greatest within 10-50 km of an active fault, is calculated by taking the spatial derivative of measured crustal velocities.

Integrating GPS & InSAR to Resolve Stressing Rates Along the San Andreas System


By Bridget Smith-Konter, David T. Sandwell, and Meng Wei - Summer 2010

New estimates of seismic hazard (e.g., UCERF, will rely on high…, ,

Figure 2: Interferogram of the April 2010 earthquake in Baja California, Mexico, from ALOS PALSAR (Advanced Land Observing Satellite Phased Array type L-band Synthetic Aperture…, , ,

Figure 3: Remove-stack-restore interferograms for the Salton Sea area. (a) Physical model constrained by GPS data. (b) Stacked residual interferograms after applying the…,


Bird, P. (2009), Long-term fault slip rates, distributed deformation rates, and forecast of seismicity in the western United States from joint fitting of…

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U-Pb Thermochronology: 4-Dimensional Imaging of the North American Lithosphere


As the USArray Transportable Array marches eastward, seismic images are providing ever more detailed insight into present day structures of the crust and mantle beneath North America. But how old are these structures and what do they tell us about the geo