The difference in transmitting the shockwaves between different materials is not that large. The general fall-off of earthquakes makes them usually regional, just as you cannot feel the recent one from, say, Italy (quite possibly not even Greece but I didn’t check). Thus even is they travel thee times further in lower layers, it would still not reach that far. It also falls off very quickly, below the thresholds needed to trigger another faultline.
There typically are dozens/hundreds of aftershocks following a major earthquake, and there have been with this latest one. According to [this CNN article](https://www.cnn.com/2023/02/06/world/turkey-syria-earthquake-epicenter-maps-dg/index.html), there have been over 100 aftershocks, one almost as powerful as the initial earthquake.
The difference in transmitting the shockwaves between different materials is not that large. The general fall-off of earthquakes makes them usually regional, just as you cannot feel the recent one from, say, Italy (quite possibly not even Greece but I didn’t check). Thus even is they travel thee times further in lower layers, it would still not reach that far. It also falls off very quickly, below the thresholds needed to trigger another faultline.
There typically are dozens/hundreds of aftershocks following a major earthquake, and there have been with this latest one. According to [this CNN article](https://www.cnn.com/2023/02/06/world/turkey-syria-earthquake-epicenter-maps-dg/index.html), there have been over 100 aftershocks, one almost as powerful as the initial earthquake.
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