The asthenosphere is located beneath the Earth’s lithosphere, which includes the crust and the uppermost portion of the mantle. Specifically, it extends from about 100 kilometers (62 miles) to approximately 700 kilometers (435 miles) below the Earth’s surface. This layer is part of the upper mantle and is characterized by its semi-fluid or plastic-like properties, which allow for the movement of tectonic plates above it.
The asthenosphere plays a crucial role in plate tectonics, as its ability to flow facilitates the movement of these plates. This is significant for various geological processes, including continental drift, earthquakes, and volcanic activity. Understanding the asthenosphere’s location and properties helps geologists and scientists comprehend how our planet works beneath its surface.