Understanding Shearing in Geology

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<h3>Understanding Shearing in Geology</h3>

In the world of geology, the term “shearing” describes a distinct motion of two rock surfaces against each other. It is most often caused by intense pressure under the earth’s crust.

Description

Shearing can be described as the lateral movement of one rock surface against another. This motion alters the rocks, causing them to change shape as they slide against each other.



Effects

Many times, shearing causes minerals to split in a formation known as cleavage. Under other circumstances, the rocks develop a pattern of parallel lines called a schist.

Where It Occurs

Shearing commonly occurs along the edges of tectonic plates, although it may occur in other places as well. Most often it takes place between 10 and 20 kilometers beneath the earth’s surface. If the same process occurred at the surface, it would result in fracturing and faulting.

Zones

Widespread shearing results in geological features called shearing zones. These zones may cover several miles or just a few centimeters.

Dave Pennells

By Dave Pennells

Dave Pennells, MS, has contributed his expertise as a career consultant and training specialist across various fields for over 15 years. At City University of Seattle, he offers personal career counseling and conducts workshops focused on practical job search techniques, resume creation, and interview skills. With a Master of Science in Counseling, Pennells specializes in career consulting, conducting career assessments, guiding career transitions, and providing outplacement services. Her professional experience spans multiple sectors, including banking, retail, airlines, non-profit organizations, and the aerospace industry. Additionally, since 2001, he has been actively involved with the Career Development Association of Australia.