Ambient noise station-correlation spectra for USArray stations

P11A-TA secondary stations.

L12A-TA M09A-TA M10A-TA M11A-TA M12A-TA M13A-TA N08A-TA N09A-TA N10A-TA N11A-TA
N12A-TA N13A-TA O07A-TA O08A-TA O09A-TA O10A-TA O11A-TA O12A-TA P07A-TA P08A-TA
P09A-TA P10A-TA P12A-TA Q07A-TA Q08A-TA Q09A-TA Q11A-TA Q12A-TA R08A-TA R09A-TA
R10A-TA S09A-TA
DUG-US TPNV-US