How Pe'ahi (Jaws) Works
Hawaii, USA · part of the Pe'ahi (Jaws) spot guide
The whole story of Pe’ahi — Jaws — is one landform. Off the mouth of Pe’ahi Gulch on Maui’s north shore, a cone-shaped submarine ridge points northwest, straight up the dominant winter-swell corridor. Long-period north-northwest swell refracting and converging on that ridge is what stands the wave up into the giant, perfectly shaped barrel that defined tow-in surfing and now big-wave paddle surfing.
| Zone | Approx. depth | What happens here |
|---|---|---|
| Outer ridge nose | 180–250 ft | Where the swell first feels the northwest-pointing ridge and refraction begins |
| Trench / channel flank | 100–100 ft | A deep canyon off the gulch — the safe blue-water exit beside the peak |
| Refraction shelf | 40–60 ft | Converging wave fronts stack energy here as it approaches the peak |
| Breaking reef (takeoff) | 20–20 ft | The shallow shoulder where the bowl jacks and throws |
| Inside / impact | 0–10 ft | Whitewater surges toward the lava point and cliff — the wash-through zone |
The mechanism is convergent refraction on the ridge. As a long-period north-northwest groundswell crosses the abrupt change from a trench over 100 ft deep to a reef around 20 ft, it slows and bends toward the shallow water, and because the ridge is convex and aimed into the swell, energy off both flanks steers to the same focal reef patch — sources describe the wave standing up to several times the deep-water swell height.
That same refraction is why forty-to-sixty-foot faces are makeable rather than pure closeouts: it produces a shaped wave with a deep-water channel alongside, where the trench never lets the swell break, giving a blue-water exit. Because the reef itself is deep, Pe’ahi is a big-wave-only wave — small swell passes over nearly unbroken, and it takes a giant, long-period north swell to wake it.
Pe'ahi (Jaws) wave mechanics — FAQ
Why is Jaws so much bigger than the nearby coast?
An offshore, northwest-pointing cone ridge refracts and converges long-period north-northwest swell onto a deep reef, standing the wave up to several times its open-ocean height while the coast nearby stays small.
What swell and period does it need?
Long-period north-northwest swell, best around 330° to 010°, ideally 18 to 22 seconds. It is a winter-only, big-swell-only wave.
How do I read the buoy?
Watch the Pauwela buoy (51205), but remember it shows offshore significant height — the face is several times larger. Around 18 to 25 ft at 18 to 22 seconds from the north-northwest is an XXL, 40-to-60-foot day.
Is it paddle or tow?
Both — tow-in surfing was invented here in the 1990s, and the paddle ceiling reached a 63-foot record in 2016. It is an experts-only wave with essential ski patrol.