Answer : 4. "Encircling Pacific seismic belt"
Explanation :

The volcanic ranges surround the Pacific Seismic Belt. It is called so because earthquakes and volcanic eruptions occur frequently due to tectonic activity. There are more than 452 volcanoes in this area. About 90% of earthquakes occur along volcanic ranges. The volcanic range is a 40,000 km long horseshoe-shaped area in the Pacific Basin.