>https://shepardessoffire.home.blog
The faggot who wrote the page has little of an idea about earthquakes & sensors & location techniques – so this is what happens…
It's a big nothingburger (at best, at worst a slide), and if he'd done the analysis correctly it would be more clearly understandable what he observed:
In the last say 10 to 15 years, mainly two things have happened:
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Number of earthquake sensors worldwide has increased significantly, and their sensitivity improved.
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Data processing & storage has become cheaper & more powerful.
Reason for the observation is that now much more weak earthquakes are detected (say mag<5).
But depth determination is still a weak spot, requiring a good network geometry, good data quality & many stations that recorded the event with sufficient quality.
Signals from events of mag 4 and smaller don't travel far, so for those you'd need a dense local network.
If you have a national network, you might have two or three stations picking them up, but not enough stations (locally at the event epicenter) to determine depths reliably.
I could go on explaining, but don't want to waste bread – it's just BS what the guy (if tentatively) implies.
Back to lurking for me…..