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| Portable Array Seismic Studies of the Continental Lithosphere | |
|---|---|
| Name | Portable Array Seismic Studies of the Continental Lithosphere |
| Caption | Deployable broadband seismometer array on continental crust |
| Type | Scientific field campaign |
| Established | Late 20th century |
| Discipline | Geophysics |
| Notable | EarthScope, USArray, IRIS |
Portable Array Seismic Studies of the Continental Lithosphere
Portable array seismic studies employ deployable networks of seismometers to map the structure, composition, and dynamics of the continental lithosphere. Combining temporary broadband sensors, nodal instruments, and dense receiver arrays, these campaigns link observational programs to geologic, geodynamic, and resource investigations across diverse regions. Field deployments coordinate institutions, funding agencies, and community experiments to produce datasets used by modelers, hazard analysts, and exploration teams.
Portable array experiments evolved from collaborations among National Science Foundation, Incorporated Research Institutions for Seismology, United States Geological Survey, Lamont–Doherty Earth Observatory, and university consortia such as Massachusetts Institute of Technology, California Institute of Technology, and University of California, Berkeley. Early projects like USArray and international initiatives involving British Geological Survey, Geological Survey of Canada, GFZ German Research Centre for Geosciences, and Geoscience Australia established standards for logistics, metadata, and open data. Contemporary campaigns integrate contributions from research centers including Scripps Institution of Oceanography, University of Oxford, ETH Zurich, Seismological Society of America, and industry partners such as Schlumberger and Chevron for resource-oriented studies.
Portable arrays use instruments produced by manufacturers and labs including Nanometrics, Trillium (seismometer), Streitberger, and lab-built nodes developed at institutions like IRIS DMC and University of Cambridge. Deployments range from sparse telemetered stations modeled on Global Seismographic Network practices to dense nodal arrays inspired by experiments at Parkfield, San Andreas Fault Observatory at Depth, and Iceland Rift. Logistics often involve coordination with agencies such as Federal Emergency Management Agency when working near infrastructure, and with landowners, parks like Yellowstone National Park or Grand Canyon National Park, and indigenous authorities. Typical strategies include transects, grids, and linear profiles that sample cratons, shields, orogenic belts such as the Himalayas, Andes, or Appalachians.
Data pipelines build on software and standards from IRIS, ObsPy, Seismic Unix, and processing suites developed at University of Washington and Stanford University. Acquisition includes continuous broadband records, high-frequency nodal bursts, and controlled-source shots using sources similar to those in Industry-Industry Consortiums and experiments like Kaikōura earthquake studies. Processing steps reference timing from Global Positioning System, instrument responses cataloged by Data Management Center (IRIS), and quality control protocols endorsed by American Geophysical Union workshops. Techniques include rotation of seismograms, spectral whitening, and cross-correlation implemented in community codes maintained by European Seismological Commission contributors and research groups at University of Tokyo.
Imaging integrates body-wave tomography, surface-wave dispersion analysis, receiver-function stacking, ambient-noise tomography, and full-waveform inversion developed at centers such as Los Alamos National Laboratory, Lawrence Livermore National Laboratory, and Princeton University. Methods often combine isolated-event travel-time tomography from catalogs like International Seismological Centre with ambient-noise correlation derived from continuous records distributed by IRIS DMC. Models draw on thermodynamic databases maintained at USGS and rheological frameworks from researchers at University of Cambridge and ETH Zurich. Inversions employ algorithms from computational groups at Oak Ridge National Laboratory and supercomputing facilities such as Oak Ridge Leadership Computing Facility.
Portable arrays have revealed lithospheric architecture across cratons (Canadian Shield, West Africa Craton), orogens (Himalaya, Alps), and rift systems (East African Rift, Basin and Range Province). Studies with USArray and targeted experiments near Salt Lake City and New Madrid Seismic Zone refined models of crustal thickness, sedimentary basins, and mantle anisotropy. High-resolution imaging in regions like Iceland and Kamchatka elucidated plume–lithosphere interactions, while deployments in Chile and Japan improved understanding of subduction interface processes tied to the 2011 Tōhoku earthquake and tsunami and other megathrust events. Portable arrays contributed to locating geothermal resources near Yellowstone and hydrocarbon-relevant structures evaluated by collaborations with BP and ExxonMobil.
Limitations include logistical constraints in remote regions such as Siberia and polar areas like Antarctica, permitting and access in protected areas like Grand Teton National Park, seasonal noise variations documented near Amazon Basin expeditions, and cultural considerations involving indigenous territories across Australia and Canada. Technical uncertainties stem from trade-offs between spatial coverage and frequency bandwidth, instrument self-noise for weak signals measured at Berkeley Seismology Laboratory, and nonuniqueness in inversions highlighted by debates at AGU meetings. Data heterogeneity across vendors and campaigns complicates integration despite standards promoted by IRIS and FDSN.
Results inform tectonic reconstructions of supercontinents like Pangea and Rodinia, resource exploration workflows used by firms such as TotalEnergies and Chevron, and seismic-hazard assessments underpinning building codes influenced by agencies like Federal Emergency Management Agency and standards bodies. Portable array-derived models support earthquake early warning research pursued by ShakeAlert, volcanic monitoring led by USGS Volcano Hazards Program and Japan Meteorological Agency, and geothermal site selection used by national programs in Iceland and New Zealand. Cross-disciplinary applications engage researchers at NASA for crustal deformation studies and at NOAA for tsunami source characterization.