An earthquake fault definition begins with understanding that the Earth’s crust is fractured into numerous segments. These movements dictate the type of seismic hazard a region might face.
Earthquake Fault Definition and Crust Segments
This failure happens along a plane of weakness, and the surfaces on either side slide past one another. The fault zone itself extends deep into the crust and can be hundreds of meters wide, filled with crushed and fractured rock known as fault gouge.
The trace of this break on the surface is what geologists map as the fault line, while the actual rupture zone beneath the surface is the fault plane. The primary categories are determined by the relative motion of the hanging wall (the block above the fault) and the footwall (the block below).
Earthquake Fault Definition and Crust Segments
Dip-Slip Faults Dip-slip faults involve vertical movement, where one block moves up or down relative to the other. Active faults are those that have moved within the last 10,000 years and are likely to move again.
More About Earthquake fault definition
Looking at Earthquake fault definition from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Earthquake fault definition can make the topic easier to follow by connecting earlier points with a few simple takeaways.
