Ambient noise station-correlation spectra for USArray stations

E15A-TA secondary stations.

B13A-TA C12A-TA C13A-TA C14A-TA D11A-TA D12A-TA D13A-TA D14A-TA D15A-TA E11A-TA
E13A-TA E14A-TA F11A-TA F12A-TA F13A-TA F14A-TA F15A-TA G13A-TA G14A-TA G15A-TA
H12A-TA H13A-TA
BOZ-US EGMT-US