Ambient noise station-correlation spectra for USArray stations

O12A-TA secondary stations.

K12A-TA K13A-TA K14A-TA L12A-TA L13A-TA M09A-TA M10A-TA M11A-TA M12A-TA M13A-TA
N08A-TA N09A-TA N10A-TA N11A-TA N12A-TA N13A-TA O08A-TA O09A-TA O10A-TA O11A-TA
P08A-TA P09A-TA P10A-TA P11A-TA P12A-TA Q09A-TA Q11A-TA Q12A-TA R10A-TA
DUG-US