Marine deposits have been reported on Madagascar’s southwest coast at about 94 m elevation and on lower and upper escarpment surfaces around 145 m and 157–180 m. The cited estimate for a wave able to reach the reported deposit level is nearly 90 m; the deposits do not measure a wave above 200 m. Chevron dunes at the island’s southern tip reach about 185 m, and their origin remains debated between mega-tsunami deposits and giant aeolian dunes. The video argues that back-azimuth analysis points to the proposed Burkel crater on the Indian Ocean floor as the impact source, but the cited evidence does not establish Burkel as an impact crater or the cause of the deposits.
Madagascar cliff deposits suggest a large tsunami, not a proven 200-meter impact wave
Key facts
- Marine deposits have been reported on Madagascar’s southwest coast at about 94 m elevation and on lower and upper escarpment surfaces around 145 m and 157–180 m.
- The estimate cited for a wave able to reach the reported deposit level is nearly 90 m; the deposits do not directly establish a wave height above 200 m.
- The stated elevation values do not support a 100 m-plus elevation step or overtopping.
- Chevrons at Madagascar’s southern tip reach about 185 m, but their origin remains debated between mega-tsunami deposits and giant aeolian dunes.
- The video argues that back-azimuth analysis points to the proposed Burkel seafloor crater as the impact source; the cited results do not confirm the impact crater or the causal link.
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.
Madagascar - Tsunamithinkhazard.org
In the area you have selected (Madagascar) tsunami hazard is classified as medium according to the information that is currently available.
Madagascar Field Survey after the December 2004 Indian ...ui.adsabs.harvard.edu
by EA Okal · 2006 · Cited by 56 — Runup and inundation were obtained at 52 sites, covering most of the eastern coast of the country, ranging from a maximum runup of 5.4 m in the south to ...
Did An Ancient Mega-tsunami Crash Into Madagascar?iflscience.com
Since the cliffs are 175 meters (574 feet) high, a wave would need to be nearly 90 meters (295 feet) to leave such deposits – no mean feat.
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