DECONSTRUCTING MECCA: A Geological Breakdown of Oahu's Fabled North Shore

After marching thousands of miles across the North Pacific unfettered, the North Shore's reefs find the ideal balance of depth and resistance ot manage the almighty surge. Sunset Beach - a study in bathymetry.

On Oahu, with its inshore reef, this phenomenon is demonstrated by a proliferation of surf breaks compressed into a very small area, most of them spectacular. By comparison, offshore barrier reefs usually feature a single pass servicing an expansive lagoon. Which is why you can’t do a flying kickout on the North Shore without hitting a good surf spot, whereas even after decades of passionate exploration, Fiji has produced only one Tavarua.

Oahu’s global positioning is also a major factor in its surfing eminence. The Hawaiian Islands comprise the most isolated archipelago on Earth, located more than 2,000 miles southwest of the United States. More importantly (to us, at least) are the hundreds of thousands of square miles of trackless Pacific to the north of the island chain. While not the northernmost of the major Hawaiian Islands—Kauai sits some 60 miles to the northwest—Oahu presents more of its northern coastline directly to the expansive Pacific than any of its neighbors. The shoreline from Kaena Point to Kahuku opens up like a giant catcher’s mitt, waiting for whatever the mighty North Pacific might toss its way.

Which is where meteorology comes into play—a calabash bowl full of global weather ingredients produce the recipe for epic North Shore surf. One of the main factors is the jet stream, that river of high altitude, high-velocity wind that circles the globe. More specifically the North Pacific jet stream, which flows off Russia and East Asia in an easterly direction, helping guide the course of sub-polar and mid-latitude low-pressure systems, storms that form in the Sea of Japan. These massive storms travel from east to west—monster wave-making machines headed straight into a swell window that opens directly onto Oahu’s northern shore. The extraordinary size and wind speed of these storms help generate huge swells—the stuff of surfing legends. In 1969, for example, a large storm near the Kamchatka Peninsula moved east and combined with another extremely low-pressure system moving west, maintaining wind speeds in excess of 50 mph along a storm front that measured 1,700 nautical miles. It then remained stationary for a day when it was joined by yet another storm, producing...the epic Swell of ’69, which closed down the entire North Shore. Something very similar happened again in 1998, producing the largest waves ever surfed on the North Shore, including the groundbreaking session at 60-foot Outside Log Cabins.

Yet it’s not just the size of the swells generated by these North Pacific juggernauts that have earned the North Shore its reputation—waves as high as Waimea have been discovered in many other regions. North Shore waves, however, are considered the most powerful on Earth. The reason, as explained by no less an authority than Dr. Ricky Grigg, oceanographer, North Shore pioneer, and 1966 Duke Kahanamoku Invitational champion, is two fold.

“What you have is high-intensity storms whose proximity is far enough away to generate large swells with long periods,” explains Dr. Grigg. “But not so far away from the Hawaiian Islands that their power degrades. These swells hit the northern shore of Oahu with all that power intact, not slowed by other island chains or a continental shelf. What breaks on the North Shore is raw North Pacific power, pound for pound the most powerful wave on the planet.”

As if anyone who’s ever been caught inside at Sunset’s West Peak doesn’t know this. But it also explains why even a 3-foot wave at Ehukai Beach Park can ring your bell if it lands the right punch. Of all the places in all the oceans, this nine-mile strip is uniquely situated both geologically and meteorologically (Did we talk about the prevailing northeast trade winds that blow straight offshore at many of the North Shore’s premier breaks?) to produce technically the heaviest waves ever.

This fact alone could justify the sport’s enduring fascination with the North Shore, but factor in the human element, and it’s easy to see why the Kam Highway from Haleiwa to V-Land becomes surfing’s Indy 500 every winter. Many big- wave breaks have been discovered and pioneered during the course of the past two decades, and most share a common theme: remoteness. Maverick’s breaks off a jagged Northern California reef fronted by a crumbling cliff; Isla Todos Santos requires a chilly, sketchy panga ride (and even sketchier border crossing); Peahi is accessible only by sea, and then only by hellmen; Dungeons…well, hell, Dungeons is located off Africa’s Cape of Storms, a foreboding graveyard of ships. By comparison, surfing the North Shore is like a trip to the mall with at least a dozen world-class breaks lined up along the highway like so many big-wave Banana Republics. The Big Five—Haleiwa, Laniakea, Waimea Bay, Pipeline, and Sunset Beach—are all literally on the side of the road. All but Laniakea have ample parking, showers, and bathrooms. On the North Shore it’s easy to ride the world’s hardest waves. Or at least to park and paddle out.