M 7.1 Quake Estrn PNG coming in NOW

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davenn

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A decent amplitude on my seismograph

 

davenn

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davenn

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fresh_42

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I always find it really astonishing how precise those measurements from the other side of the planet are. In such a depth the error margin ##130 \pm 3## is pretty good, and ##7.0## to ##7.2## as well, considering the depth. Looks as if we all live on a giant bell.
 

davenn

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Can such deep quakes be felt at the surface in the sense that we should expect damages?
up to around 150km and M7++, yes for sure, but not likely to be as bad. It's a little different to a M7+ event that is shallow and say 130km away as the Surface waves, the ones that cause most of the damage, are so very much stronger for a shallow event.

here's a graph from wiki showing the drop off of various period surface waves with depth

Rayleigh_Wave_vs._Depth.jpg


Interestingly, it can be seen that 50 second period waves pea just below 100km depth
 

davenn

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here's a screenshot of my seismogram

190506 2119UT Mw7.1 estrn PNG zhism.jpg
 

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