The USArray component of the NSF-funded EarthScope project ended its observational period in September 2021 and all remaining close-out tasks concluded in March 2022. Hundreds of seismic stations were transferred to other operators and continue to collect scientific observations. This website is now in an archival state and will no longer be updated. To learn more about this project and the science it continues to enable, please view publications here: and citations of the Transportable Array network DOI 10.7914/SN/TA.

To further advance geophysics support for the geophysics community, UNAVCO and IRIS are merging. The merged organization will be called EarthScope Consortium. As our science becomes more convergent, there is benefit to examining how we can support research and education as a single organization to conduct and advance cutting-edge geophysics. See our Joining Forces website for more information. The site will soon host the new EarthScope Consortium website.

A Continental-scale Seismic Observatory


EarthScope is funded by the National Science Foundation. EarthScope was constructed and is being operated and maintained as a collaborative effort with UNAVCO Inc. and the Incorporated Research Institutions for Seismology, with contributions from the United States Geological Survey, NASA, and several other national and international organizations.

The USArray activities described in this website are supported by the National Science Foundation under the following EarthScope USArray-related awards to IRIS: EAR-0323309 "Collaborative Research: EarthScope-Acquisition, Construction, and Facility Management (USArray)", EAR-0323311 "Collaborative Research: EarthScope-Facility Operations and Maintenance (USArray)", EAR-0733069 "Collaborative Research: EarthScope Facility Operation and Maintenance (FY2008-FY2013) (USArray)", and EAR-1261681 "Seismological Facilities for the Advancement of Geoscience and EarthScope".

Any opinions, finding, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.