If dP/dt appears noisy, compare with
OSO weather observations.
A typical noise level is ±20 nm/s2.
If gravity is noisier than that, suspect
storm on the Atlantic or European shelves.
We also offer
24-hours diagrams for yesterday and before.
The latest 31 days
( =>in big).
inverse water level (IWL) at Onsala in hPa +1013,
bottom pressure proxy at Onsala; (the four at 1 smp/h).
well water level in dm,
▉: tide+baro residual (at 1 smp/min;
tide model revisions: 2014-05-01, 2014-05-18, 2015-02-05)
P and IWL would follow each other if the response were static.
Power spectrum (MEM) of micro-seismicity shows average during one hour (black)
and nine sliding 20-minute slices with ten minutes'
report (from yellow, early, via red
to purple, late). The pyjamas pattern aims to relate frequency to
▉Greater North Atlantic,
More on stormy weather and gravity.
spectrograms vs. time;
the light-green curve is their baseline.
(MEM = maximum entropy method)