High gain broad band velocity sensors and accelerometers distributed throughout the Central and Eastern parts of the United States. Stations were initially operated under the Transportable Array (TA) network. Roughly 1 in 4 (hence the network code!) TA stations were selected to remain permanently in the central and eastern US. N4 was operated by ANF/UC San Diego from 2013-2018 and adopted by the USGS in 2019.
This data repository is not currently reporting usage information. For information on how your repository can submit usage information, please see our documentation.