In face of recent events how come one big earthquake don’t make a global chaos with its ripple triggering earthquakes everywhere? As I understand below the outer earth layer we have magma which is liquid and would transmit the shockwaves more easily than solid.
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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.
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