The top 7 to 9 m are loose sands which are prone to liquefaction. Beneath which there 5 to 7 m of dense sand with average SPT between 25 to 40. Below this at around 15 m depth, there exists a 1.5 m thick loose sand layer with average SPT value of 9. ( Also a similar weak layer at 20 m depth as well)

Will this layer liquefy? if yes, which ground improvement technique can be used to mitigate it?

If no, why? And in that case please refer me to some supporting articles and case histories.