Seismology

A colored map showing major and minor tectonic plates on Earth.

Understanding the Earth’s Structure: A Guide to Tectonic Plates

Caitlin Dempsey

The Earth's lithosphere is divided into tectonic plates, which are in constant motion. Learn where to find GIS data on tectonic plates.

How Big Was the Tonga Volcanic Eruption?

Caitlin Dempsey

Tonga was rocked by an undersea volcano eruption on January 15, 2022, which sent shockwaves throughout the planet.

Map showing the Mendocino Triple Junction.

What are the Three Plates that Make up the Mendocino Triple Junction?

Caitlin Dempsey

The Mendocino Triple Junction is located in the Pacific Ocean near Cape Mendocino in northern California.