Ambient noise station-correlation spectra for USArray stations

A12A-TA secondary stations.

A08A-TA A09A-TA A10A-TA A11A-TA A13A-TA B08A-TA B09A-TA B10A-TA B11A-TA B12A-TA
B13A-TA C08A-TA C09A-TA C10A-TA C12A-TA C13A-TA C14A-TA D09A-TA D10A-TA D11A-TA
D12A-TA D13A-TA D14A-TA E10A-TA E11A-TA E13A-TA
NEW-US