Frequently Answered Question

Beginning in 2011, infrasound sensors have been installed at all new TA sites and at some previously existing sites. As of April 2012, 370 sites have had Setra 278 and NCPA microbarometers co-located with the seismic sensors. The Setra instrument data is found in the BDO and LDO channels; NCPA data is found in the BDF and LDF channels. The data can be accessed in SEED format using standard IRIS DMC data request tools.