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Visualize the impact of Rosie O'Donnell doing a cannon ball off the high board.
In researching this, I discovered that there are a great many people who are willing to accept any explanation, as long as it is more bizarre than the last. Ley lines, the "harmonic recipricol of the speed of light," whatnot...
Impact tsunami–EltaninAbstract: Employing classical tsunami theory and elementary assumptions about the initial shape of impact cavities, we compute tsunami from the Eltanin asteroid collision at 2.15 Ma. An Eltanin impactor 4 km in diameter would have blown an initial cavity as deep as the ocean and 60 km wide into the South Pacific and delivered a 200–300 m high tsunami to the Antarctic Peninsula and the southern tip of South America 1200–1500 km away. New Zealand, 6000 km distant, would have met 60 m waves. Generalizing these results to other size impactors, we fit simplified tsunami attenuation laws to maximum tsunami heights extracted from the full-wave calculations. If Eltanin was 1 km in diameter instead of 4 km, its waves would have been at least five times smaller. An asteroid the size of Chicxulub (10 km diameter), had it fallen into water deeper than 1000 m, would have sent a 100 m tsunami out to 4000 km distance, even if shoaling amplifications are neglected.
Steven N. Ward
Erik Asphaug
Forests Frozen In Time
Science Frontiers (#51) ^ | May-Jun 1987 | William R. Corliss
Posted on 01/15/2005 3:53:29 PM PST by SunkenCiv
http://www.freerepublic.com/focus/chat/1321587/posts
Giant asteroid rocked Antarctica
Near Earth Object Information Centre ^ | 8/20/2004 | staff
Posted on 10/17/2004 9:26:51 PM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-bloggers/1248406/posts
Japan Scientists Find Million-Year-Old Ice (in Antarctica)
abcnews.go.com | 1/24/2006 | AP
Posted on 03/27/2006 4:26:18 AM EST by S0122017
http://www.freerepublic.com/focus/f-chat/1603789/posts
I should have looked for additional work on the dating of this tsunami, but anyway...A possible Plio-Pleistocene tsunami deposit,Many features of the Hornitos conglomerate bed are considered to be characteristic of a tsunami deposit according to the criteria identified by Einsele (1998)... An alternative interpretation as a large debris flow deposit derived from the adjacent alluvial fans is unlikely, as: 1- it is difficult to envisage how a debris flow could result in subaqueous scouring of the shoreface and incorporate shell material, sandstone intraclasts and foreshore-derived pebbles into the resulting deposit; 2- any debris flow deposit is likely to be eroded and reworked by subsequent storm and fairweather processes, and 3- the location of the conglomerate deposit ranges from 3-5 km from the coastal scarp and its associated drainage system... The Plio-Pleistocene drainage is still preserved along the coastal cordillera... and is of insufficient size to develop such a high magnitude event...
Hornitos, northern Chile
Adrian Hartley, John Howell,
Anne E. Mather, Guillermo Chong
July 2001
Revista geológica de Chile
A possible explanation for both the depositional environment and thickness of the Hornitos conglomerate bed is that the Pliocene tsunami was an extremely large magnitude event... supported by the size of the clasts incorporated within the flow that were transported from the alluvial fan into the shoreface... a particularly powerful current would have been required to remove unconsolidated sand, scour at least a metre down into the shoreface and rip-up large clasts of semi-lithified sandstone. This powerful event left a substantial deposit in the upper shoreface... only limited reworking took place prior to deposition of the next bed. As the top of the conglomerate appears to be abruptly overlain by shoreface sandstones, it is likely that some reworking has taken place...
The large scale of the Hornitos conglomerate bed, as previously noted, suggests that it represents a very large magnitude event deposit. As such this event bed should form a useful stratigraphic marker correlatable throughout the Pliocene succession of northern Chile.
FIG. 4. General view of tsunami deposit at Hornitos displaying shallow marine sediments incorporated in a conglomerate as recumbent folds (A); thrust sheets (B), and rip-up clasts (C). Note the erosive base of the deposit (1) partially obscured by slope material (2).
