It’s the earthquake prone area where occurs a gap in the occurrence record of major earthquakes.
This means, that statistically, major earthquake is due ie, much more time had elapsed since the last major earthquake than the average time gap between two major earthquake as per the historical occurances.
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Earthquake waves gets significantly amplified when they passed through soft grounded ( water saturated alluvial deposits).
Liquefaction is sudden loss of strength of water saturated soils resulting from shaking during an earthquake.
It can cause large ground cracks to open, shaking can cause soils to consolidate and thus to occupy a smaller volume.
During shaking of an earthquake, the water saturated material may result in subsidence, fracturing and horizontal sliding of the ground surface.