what causes ocean waves

Ocean waves are caused mainly by wind transferring energy to the water’s surface. Bigger or more dangerous waves can also come from storms, underwater earthquakes, landslides, and volcanic eruptions.

Quick Scoop

Waves are really energy moving through water, not the water itself traveling across the ocean. Wind creates most everyday waves by rubbing against the surface and building ripples into larger swells.

Main causes

• Wind: the most common cause of ocean waves.

• Storms: strong winds and low pressure can create storm surge.

• Underwater earthquakes or landslides: these can trigger tsunamis.

• Tides: the pull of the Moon and Sun affects sea level, though tides are different from normal wind waves.

Why waves break

As waves move into shallow water, the seafloor slows the lower part of the wave. That makes the top rise, steepen, and eventually break on shore.

Simple example

A breezy day at the beach makes small ripples. If that wind keeps blowing over a long stretch of ocean, those ripples can grow into the rolling waves you see reaching the shore.

Tiny takeaway

The short version is: wind makes most waves, but nature can also make giant ones through storms and seafloor movement.