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A flexible component of 400 portable, three-component, short-period and broadband seismographs and 2000 single-channel high frequency recorders for active and passive source studies that will augment the transportable array, permitting a range of specific targets to be addressed in a focused manner. An additional pool of 100 portable campaign GPS receivers has been acquired for temporary deployments and rapid response.

Image of capaign instruments

Campaign/Flexible instruments allow for focused observation and study of key geophysical locals and are available to the scientific community through proposals approved by the NSF.


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GPS campaign systems include low power, large memory, dual frequency GPS receivers and antennas. Portable batteries charged using lightweight solar panels will power systems. Monumentation options will be determined on a project-by-project basis. Ten of the 100 systems include real-time kinematic capability requiring additional radio and data logging equipment. Real-time kinematic systems will be used to rapidly map fault traces and profile fault escarpments and collect precise position information for GIS based geologic mapping.

A pool of ~2400 seismic instruments (200 broadband, 200 short-period, and 2000 high-frequency) has been acquired that can be deployed using flexible source-receiver geometries. These additional portable instruments will permit high-density, short-term observations of key targets within the footprint of the larger transportable array using both natural and active sources. USArray's flexible component offers exciting opportunities for a variety of focused investigations requiring higher resolution images embedded within the context of the larger array.