It is known that the probability of volcanic eruptions increases during the annual increase in the speed of rotation of the Earth in June - July. This is the period when the spheroid becomes an ellipsoid.

Perhaps this is an option: "2. **Divergent Boundaries**: Where tectonic plates are moving apart, such as the Mid-Atlantic Ridge, where new oceanic crust is formed, leading to volcanic activity."

Most likely, this is a tropical zone.