USArray
A Continental-scale Seismic Observatory

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

Seismology-Related Information on Mw 6.9 Earthquake in Hawaii Available

Sat, 05 May 2018 19:58:00 -0400

IRIS Data Services created a Special Event page following the Mw 6.9 earthquake in Hawaii 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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IRIS Board of Directors Responds to NSF ‘Dear Colleague Letter’

Fri, 27 Apr 2018 16:23:00 -0400

The IRIS Board of Directors sent a letter to the National Science Foundation addressing the significant impact that divesture of the R/V Marcus G. Langseth will have on the acquisition of high quality marine seismic data and scientific studies of subduction zone processes, geohazards and a broad spectrum of other ocean-based studies.
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Read the Spring Issue of IRIS Data Services’s Newsletter

Fri, 30 Mar 2018 16:58:00 -0400

IRIS Data Services published the Spring 2018 issue of its newsletter which includes several articles, a program highlight, and data statistics.
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