EarthScope

EarthScope EarthScope was a continental-scale geophysical research initiative that deployed a network of instruments across the United States to study tectonics, seismicity, volcanism, and crustal deformation. It integrated field campaigns, permanent installations, and data archives to support research by investigators affiliated with universities, national laboratories, and museums. The program coordinated with agencies and observatories to provide open-access datasets for the wider scientific community.

Overview

EarthScope originated from planning within the National Science Foundation and advisory committees involving the U.S. Geological Survey, American Geophysical Union, and university consortia. Designed as a decade-long facility, it combined components managed by institutions such as the University of California, San Diego, Scripps Institution of Oceanography, Pennsylvania State University, University of Washington, and the Incorporated Research Institutions for Seismology to address questions central to plate tectonics and continental dynamics. Governance involved panels drawing on expertise from the National Academies of Sciences, Engineering, and Medicine, international collaborators including researchers from the United States, Canada, and Mexico, and partnerships with state geological surveys such as the California Geological Survey.

Instruments and Networks

EarthScope integrated multiple instrument systems: the Portable Array for Continental Lithosphere Imaging (PAL), the Transportable Array (TA), the Plate Boundary Observatory (PBO), and the San Andreas Fault Observatory at Depth (SAFOD). The Transportable Array deployed temporary broadband seismometers across states including Alaska, Hawaii, California, Nevada, Oklahoma, and Pennsylvania with logistical support from institutions like IRIS and the Berkeley Seismological Laboratory. PBO included continuous Global Positioning System stations, strainmeters, tiltmeters, and borehole seismometers installed in cooperation with entities such as the Geodetic Survey programs at Stanford University and the University of Colorado Boulder. SAFOD involved deep borehole drilling near the San Andreas Fault and collaborations with drilling partners and the California Institute of Technology to obtain in situ measurements. Other networks interfaced with the USArray, the ANSS (Advanced National Seismic System), and regional observatories like the Pacific Northwest Seismic Network.

Scientific Goals and Findings

EarthScope aimed to resolve processes from mantle convection to surface deformation, addressing hypotheses from the theory of plate tectonics and extensions involving lithospheric mantle dynamics. Major scientific outcomes included refined models of crustal structure beneath provinces such as the Basin and Range Province, improved constraints on seismic hazard in regions like Southern California and the New Madrid Seismic Zone, and insights into the seismic behavior of subduction systems near the Cascadia Subduction Zone. Seismic tomography studies produced images of mantle plumes beneath areas related to the Yellowstone Caldera and clarified links between magmatism and tectonics in the Rio Grande Rift. GPS time series advanced understanding of earthquake cycle phenomena documented in research involving the Parkfield segment and the San Andreas Fault system; studies integrated paleoseismology results from the Paleoseismology community and historic catalogs such as those curated by the USGS. EarthScope datasets enabled cross-disciplinary work connecting geomorphology researchers at institutions like the University of Arizona with volcanology teams from the University of Alaska Fairbanks and gravity studies conducted by personnel affiliated with the National Geodetic Survey.

Operation and Management

Management structures combined cooperative agreements and facility operations overseen by awardees of large-scale grants from the National Science Foundation and operational partnerships with IRIS, the UNAVCO consortium, and regional data centers. Stewardship included data curation practices aligned with policies from the Data Conservancy and coordination with the Global Seismographic Network. Field operations engaged logistics from university seismology labs, drilling management by contractors experienced with projects like the San Andreas Fault Observatory efforts, and permitting coordinated with federal land managers such as the Bureau of Land Management and the National Park Service. Post-deployment, EarthScope transitioned elements to sustained networks including the USArray legacy archives, with data distribution maintained through portals managed by IRIS Data Services and the UNAVCO Data Center.

Outreach and Education

Outreach programs leveraged collaborations with museums such as the Smithsonian Institution and science centers including the Exploratorium to present exhibits and public lectures. Education initiatives supported graduate training through programs at universities like Massachusetts Institute of Technology, University of California, Santa Cruz, and University of Texas at Austin, and promoted K–12 curricula developed with educators linked to the National Science Teachers Association. Citizen science and community engagement efforts included partnerships with state emergency management agencies, local school districts, and public information campaigns coordinated with the American Red Cross and Federal Emergency Management Agency to translate EarthScope findings into seismic preparedness resources.

Category:Geophysics Category:Seismology Category:Geodesy