Unveiling the Mysteries of Maka Lahi: A Geological Marvel in Tonga's Coastal Farmland
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Unveiling the Mysteries of Maka Lahi: A Geological Marvel in Tonga's Coastal Farmland
[!CDATA[Located on the southern coast of Tongatapu, the largest island of Tonga in the South Pacific, are small family farms. Among the cassava and banana plants, a massive off-white boulder stands out, steeped in Tongan mythology. Recent scientific analysis suggests that this boulder was transported inland thousands of years ago when tsunami waves breached a 120-foot cliff, possibly triggered by an earthquake in the nearby Tonga-Kermadec Trench. Similar out-of-place boulders have been found in coastal regions worldwide, believed to have been moved by powerful tsunami waves. In July, researchers visited Tongatapu to study coastal boulders and were led to a colossal boulder on farmland owned by the Teisina family. This boulder, known as Maka Lahi or “Big Rock,” is the size of a two-story house and weighs over 1,300 tons. Covered in vegetation, it was nearly camouflaged. The researchers, led by Martin Köhler from the University of Queensland, calculated that the boulder must have been dislodged from a 12-story limestone cliff by waves of at least 160 feet high, possibly from a landslide tsunami. Computer simulations conducted by the researchers indicated that the massive waves that transported Maka Lahi likely occurred around 7,000 years ago. The age of the flowstone formations on the boulder suggests this timeline, predating human settlement in Tonga by about 4,000 years. Geological evidence also points to similar large wave events in New Zealand around the same time, possibly triggered by earthquakes in the Tonga-Kermadec Trench. Further investigation is needed to search for evidence of a landslide that may have caused the waves that moved Maka Lahi. Understanding the mechanisms and frequency of such hazards is crucial for preparing for future events. The study of these out-of-place boulders and their transportation by powerful waves sheds light on the potential risks posed by natural disasters like tsunamis. By unraveling the mysteries of the past, researchers hope to better predict and mitigate the impact of similar events in the future.]]