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

Request for Information: Portable Instrumentation for Magnetotelluric (MT) Studies

Mon, 08 Jul 2019 14:12:00 -0400

IRIS is currently establishing a new pool of portable instrumentation for magnetotelluric (MT) studies at the PASSCAL Instrument Center as part of the NSF-funded SAGE facility and plans to procure prototype units in the second half of 2019.
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Contribute your Research to the Central California Earthquakes Special Event Page

Fri, 05 Jul 2019 13:00:00 -0400

In response to interest in the earthquakes that occurred in Central California on July 4 and July 5, 2019 (PDT), the IRIS Data Management Center has created a Special Event web page that provides direct links to and images of data and materials available from IRIS programs and preliminary research results from the seismology community.
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See What’s New at the Data Management Center - Spring 2019 Newsletter

Fri, 24 May 2019 11:26:00 -0400

The Spring 2019 issue includes features about Jerry Carter, the new Director of Data Services; the first release of data recorded by the Mars InSight seismometer; and ROVER, a new tool to access data sets.
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