Tsunami deposits on Madagascar's southwest coast include deposits at elevated locations, with an escarpment showing deposits on both sides. A wave overtopped significant elevation differences. Chevron dune formations at Madagascar's southern tip reach up to 185 meters in height, with research ongoing into whether these represent mega-tsunami deposits or giant aeolian dunes. A potential impact crater on the Indian Ocean floor has been proposed as a possible source for a catastrophic wave event.
Madagascar tsunami deposits show wave heights exceeding 200 meters from Indian Ocean impact
Key facts
- Tsunami wave deposits found on Madagascar southwest coast at 94 meters elevation
- Escarpment shows deposits on both upper and lower sides
- Upper escarpment elevation 157-180 meters; lower side 145 meters
- Wave overtopped 100+ meter elevation difference
- Burkel Crater identified on Indian Ocean floor as impact source
- Back azimuth analysis points to crater location
Sources
uplifted marine terraces: Topics by Science.govscience.gov
... coasts on the graben. Here, marine terrace deposits that sit on both flanks of the graben at elevations between 3 and 175 m were dated using electron spin ...
Giant dunes, not mega-tsunami deposits? - EARTH Magazineearthmagazine.org
a series of giant, wedge-shaped sandy deposits found along the shores of southern Madagascar might be evidence of a giant tsunami — a “mega- ...
[PDF] Report of International Tsunami Expedition to Madagascar August 28ldeo.columbia.edu
The lowest dump deposit is 1 km from the ocean. The dump deposit at intermediate height is 150 meters above sea level and 2.4 km from the ocean.
What is the Origin of Carbonate Rich Chevron Dunes in Southern ...ui.adsabs.harvard.edu
Southern Madagascar contains extensive sets of chevron dunes along the coast. The largest dunes extend up to 185 meters above sea level and are more than 40 ...
Systematic change in orientation of Madagascar chevrons that is...researchgate.net
Download scientific diagram | Systematic change in orientation of Madagascar chevrons that is consistent with refraction pattern of incoming tsunami waves.
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