Final answer:
Concrete is the mortar commonly recommended for use in masonry walls in seismic regions as it is strong, durable, and can withstand earthquakes.
Step-by-step explanation:
The mortar commonly recommended for use in masonry walls in seismic regions is concrete. Concrete is a mixture of lime mortar, sand, small pebbles, and water that can be poured into molds and hardens to function like stone. It is strong, durable, and can withstand the forces of earthquakes better than other types of mortar.