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Sea-based blowhole Land-based blowhole. In geology, a blowhole or marine geyser is formed as sea caves grow landward and upward into vertical shafts and expose themselves toward the surface, which can result in hydraulic compression of seawater that is released through a port from the top of the blowhole. [1]
Closeup of Nakalele Blowhole Warning sign at Nakalele Point. Nakalele Point is a land mass on the eastern edge of the northern tip of the island of Maui in the state of Hawaiʻi. In Hawaiian, Nakalele or Nā-kālele means "the leaning". The Point is known for its blowhole and has become notable for its dangerous conditions when waves crash in.
The blowhole is most active when the tide is high and the winds are strong, [3] and it can shoot sea spray up to thirty feet high in the air. [4] Hālona Point is a tourist spot, with visitors coming for the scenery, the beach at the cove, and in the winter as a spot to go to see humpback whales or Honu turtles (Hawaiian Green Sea Turtles).
Hummanaya Blowhole is the only known blowhole in Sri Lanka and it is considered to be the second largest blowhole in the world. [1] Hummanaya ( Sinhala : හුම්මානය = හූ+මානය ) refers to the noise, "hoo", that can be heard a distance away when the blowhole is active.
Blowhole may refer to: Blowhole (anatomy), the hole at the top of a whale's or other cetacean's head; Blowhole (geology), a hole at the inland end of a sea cave
Chevron folding in the cliffs at Millook Haven, North Cornwall. Quaternary deposits at Porth Nanven including raised beach and head. Cornwall forms the tip of the south-west peninsula of the island Great Britain, and is therefore exposed to the full force of the prevailing winds that blow in from the Atlantic Ocean.
There is a second, less famous blowhole in Kiama, commonly referred to as the "Little Blowhole" by locals. It is much smaller than the other (called the "Big Blowhole"), but due to its narrow shape, it is more reliable than the Big Blowhole, and in the right conditions can be equally spectacular. The blowhole attracts 900,000 tourists a year. [2]
The nature of the zone of weakness itself is surely a factor, although difficult to quantify. A more readily observed factor is the situation of the cave's entrance relative to prevailing sea conditions.