Tectonic plates slide past one another at a transform plate boundary.

At a transform boundary, the plates move horizontally in opposite directions (or at different speeds), grinding side by side rather than colliding or pulling apart. A classic example is the San Andreas Fault in California, where this side‑by‑side motion produces frequent shallow earthquakes but does not create or destroy crust.

Quick Scoop

  • Answer: Transform plate boundary.
  • Motion: Plates slide horizontally past each other along faults.
  • Crust effect: Crust is fractured but neither created nor destroyed.
  • Hazards: Common site of shallow earthquakes due to the grinding motion.

In simple terms:
Convergent = crash together, Divergent = pull apart, Transform = slide past.

Mini sections

1. What this boundary is called

The type of plate boundary where two tectonic plates slide past one another is called a transform plate boundary or transform fault boundary.

2. How it moves

At transform boundaries, motion is mostly side‑to‑side (strike‑slip), so two blocks of crust shear past each other along a roughly vertical fault plane. This horizontal motion contrasts with convergent (head‑on) and divergent (pull‑apart) movement.

3. Real‑world example

The San Andreas Fault zone in California is one of the most famous transform plate boundaries on Earth. Structures that cross it can end up offset over time as the two sides of the fault slowly move in opposite directions.

HTML fact table

html

<table>
  <tr>
    <th>Boundary type</th>
    <th>Relative plate motion</th>
    <th>Crust effect</th>
    <th>Typical features</th>
  </tr>
  <tr>
    <td>Transform</td>
    <td>Slide horizontally past each other[web:1][web:5]</td>
    <td>Crust broken but not created or destroyed[web:1][web:5][web:9]</td>
    <td>Strike-slip faults, shallow earthquakes, linear valleys[web:1][web:5][web:7]</td>
  </tr>
  <tr>
    <td>Divergent</td>
    <td>Move away from each other[web:5][web:9]</td>
    <td>New crust formed as magma rises[web:5][web:9]</td>
    <td>Mid-ocean ridges, rift valleys, volcanic activity[web:5][web:9]</td>
  </tr>
  <tr>
    <td>Convergent</td>
    <td>Move toward each other[web:5][web:9]</td>
    <td>Crust destroyed or thickened (subduction or collision)[web:5][web:9]</td>
    <td>Mountain belts, deep-sea trenches, volcano arcs[web:5][web:9]</td>
  </tr>
</table>

TL;DR: At the type of plate boundary where tectonic plates slide past one another, the answer is a transform plate boundary.

Information gathered from public forums or data available on the internet and portrayed here.