Much of the activity seen on these records are the current construction taking place right outside the building we record from.
Vertical component recorded at 40 sample/second
(diagram refreshes about every 10 minutes, use your refresh button for new image)
East-West component recorded at 40 sample/second
(diagram refreshes about every 10 minutes, use your refresh button for new image)
North-South component recorded at 40 sample/second
(diagram refreshes about every 10 minutes, use your refresh button for new image)
