Ambient noise station-correlation spectra for USArray stations

D15A-TA secondary stations.

A13A-TA B12A-TA B13A-TA C12A-TA C13A-TA C14A-TA D11A-TA D12A-TA D13A-TA D14A-TA
E11A-TA E13A-TA E14A-TA E15A-TA F12A-TA F13A-TA F14A-TA F15A-TA G13A-TA G14A-TA
G15A-TA
BOZ-US EGMT-US