Explanations      Back to the live page        Retrospect: Date =2012-02-13 10:50          
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USGS  most recent notification:

Our shortlist     Free oscillation-band plot, the last 30 days     Free oscillation-band due to Chiapas earthquake Sep. 8, 2017

<= a date YYYY-MM-DD1)  + an hour HH =>   minute =>   dt (min) =>  
1) or the word  TODAY  if less than 24 h ago.                                   Expect response time 10 s

The latest 31 days (=>in big). ▉: predicted tide; ▉: barometer (P); ▉: 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 source area:   Greater North Atlantic,    Biscay,    Celtic Shelf,    Norwegian Sea,    North Sea.  More on stormy weather and gravity.
Visit  spectrograms vs. time; the light-green curve is their baseline.
(MEM = maximum entropy method)

Complaints and praise to Hans-Georg Scherneck, Chalmers/Onsala Space Observatory, hgs_kanelbulle_chalmers_dot_se   Diagrams were drawn with GMT and ImageMagick