Ambient noise station-correlation spectra for USArray stations

K14A-TA secondary stations.

G13A-TA G14A-TA G15A-TA H12A-TA H13A-TA I11A-TA J11A-TA J12A-TA J13A-TA K12A-TA
K13A-TA L12A-TA L13A-TA M11A-TA M12A-TA M13A-TA N11A-TA N12A-TA N13A-TA O12A-TA
DUG-US HLID-US