Die europäischen Staaten mit der höchsten seismischen Aktivität

Can confirm from Istanbul

Why not use Richter scale? Peak acceleration says nothing to me. I can see where it is worse, but I‘m (and I think most of the people) are used to the Richter Scale, as it is what is used in the news.

This is a Europe *seismic hazard* map (don’t confuse it with seismic activity or seismic risk which measure different things).

The text above, had it not been cropped, would say „10% Exceedance Probability in 50 years“

PGA is Peak Ground Acceleration, very strictly defined as the amplitude.of an accelerogram (diagram of ground acceleration drawn by a seismograph)

This speaks nothing of the intensity of the earthquake, which is a measure of its destructive power

The map also cannot see the future, and is extrapolated by the data we collected since prehistory in memories, almanach books, chronicles, and modern seismograph measurements . So it’s mostly statistical mumbo jumbo that does guide us a bit, but still doesn’t tell much of the expected earthquake depth (shallow earthquake = bad) , duration (long = bad if non ductile) and local conditions such as frequencies of potential earthquakes and whether they resonate with the predominant frequencies of the structures in the area, and whether they resonate with the surrounding soil.

For a complete shitshow you would have a large PGA, long duration earthquake, at a shallow depth of epicenter, hitting the predominant local type of soil-structure systems at a resonating frequencies

Also these maps get changed often, since for example Zagreb, Croatia, got hit by a two earthquakes with a 500 year exceedance rate in less than a year or two (Petrinja and Glina earthquakes 2020’s) and got a bit more „red“ on a map like this

would be really cool if the map was less blurry