How huge earthquakes don’t trigger a ripple effect?


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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Magma is much deeper and border isn’t one clear line. The deeper you go the more pockets of magma there are until there is almost only magma with almost no solid rocks. Magma is dense, viscous and under great pressure. There is some ripple effect but with distance it gets weaker.

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](, there have been over 100 aftershocks, one almost as powerful as the initial earthquake.