USArray
A Continental-scale Seismic Observatory
Update on the Status of USArray.org Content and Related EarthScope Activities

Featured Deployments

Central and Eastern United States Seismic Network (CEUSN)

Central and Eastern United States Seismic Network (CEUSN)

Recent earthquakes in the CEUS, including the 2011 M5.8 Virginia earthquake, have raised awareness of the comparative lack of knowledge about seismicity, site response to ground shaking, and the basic geologic underpinnings in this densely populated region of the country. The mission of the CEUSN is to produce data that enables researchers and Federal agencies alike to better understand the basic geologic questions, background rates of earthquake occurrence and distribution, seismic hazard potential, and associated societal risks of this region. Read More

Mid-Atlantic Geophysical Integrative Collaboration (MAGIC)

Mid-Atlantic Geophysical Integrative Collaboration (MAGIC)

MAGIC involves a collaborative effort among seismologists, geodynamicists, and geomorphologists. We are undertaking a two-year deployment of 28 broadband seismometers in a dense linear transect from the Atlantic coast to the continental interior. In combination with EarthScope USArray Transportable Array (TA) stations our experiment geometry will provide an opportunity to image isotropic and anisotropic crust and mantle structure from the coast to the continental interior in unprecedented detail, using techniques such as shear wave splitting, receiver function analysis, and tomographic inversions. Read More

Imaging Magma Under St. Helens (iMUSH)

Imaging Magma Under St. Helens (iMUSH)

This project focuses on the Mount St. Helens volcanic edifice, (WA, USA), whose explosive eruption in 1980 attracted the world's attention, and was the first volcano to be thoroughly monitored with modern instruments. Mount St. Helens provides an ideal setting to apply state-of-the-art geophysical and geochemical techniques to image its subterranean roots: It is active, easily accessible, and has a well recorded past history. Read More

SUwanee Suture and GA Rift basin experiment (SUGAR)

SUwanee Suture and GA Rift basin experiment (SUGAR)

Investigators are using travel-time tomography to create velocity models that reveal the distribution of igneous rocks, variations in the thickness of the crust and variations in crustal composition. Besides a better understanding of fundamental tectonic processes, other benefits of this program include training and education of students, and characterization of basins and igneous rocks that might be good targets for carbon sequestration. Read More

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USArray Status

USArray Status

USArray News

IRIS and UNAVCO Response to the NSF Dear Colleague Letter on the Timeline for SAGE and GAGE Re-competition

Fri, 11 Jun 2021 13:33:00 -0400

The staff and Boards of IRIS and UNAVCO are inspired by the National Science Foundation’s vision of a transformed facility for geophysics support and its decision to pursue an extended process for the next geophysical facility. Read More

UNAVCO and IRIS Joining Forces for Advancing Geophysics

Fri, 11 Jun 2021 13:00:00 -0400

Beginning in 2019, UNAVCO and IRIS began discussions focused on how both organizations can collectively work together to further advance geophysics support for the community. Read More

Tim Ahern, Director of Data Services-Emeritus, Receives SSA’s 2021 Frank Press Public Service Award

Tue, 01 Jun 2021 15:19:00 -0400

The Seismological Society of America has selected Tim Ahern, Director of Data Services-Emeritus, as its recipient of the 2021 Frank Press Public Service Award. Tim is recognized for his collaborative, open-data approach to observational seismology worldwide that has improved hazard assessment and increased public safety in at-risk communities. Read More