Question

what happens to the plates during a transform boundary

Answer 1

A transform boundary (transform fault) is where two tectonic plates slide past each other horizontally. Key things that happen there:

- Relative motion is lateral (side-to-side), either right-lateral (dextral) or left-lateral (sinistral).
- Lithosphere is neither created nor destroyed at the boundary (unlike at ridges or subduction zones).
- Plates lock and then release in stick‑slip fashion, storing elastic strain until it’s released suddenly — this produces shallow, often strong earthquakes (elastic rebound).
- The fault zone can offset rivers, roads and other features, form linear valleys or fault scarps, and produce localized features like pull‑apart (rift) basins at releasing bends or uplifted ranges at restraining bends.
- On the seafloor, transform faults commonly offset mid‑ocean ridges and run roughly perpendicular to them.
- There is typically little volcanic activity directly on simple transform segments, though releasing bends can allow some volcanism.

Example: the San Andreas Fault (California) is a continental transform where the Pacific Plate moves northwest relative to the North American Plate.