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Ejecta Blankets: Ejecta blankets are the continuous layer of debris that surrounds the impact crater, thinning outwards from the crater's rim. The composition of the ejecta blanket can provide valuable information about the geological composition of the impacted surface and the projectile that caused the impact.
An ejecta blanket is deposited in the interior regions of the crater rim to the final crater rim and beyond the crater rim. [2] Approximately half the volume of ejecta falls within 1 crater radius of the rim, or 2 radii from the center of the crater. The ejecta blanket becomes thinner with distance and increasingly discontinuous.
The volcanic explosivity index (commonly shortened to VEI) is a scale, from 0 to 8, for measuring the strength of eruptions but does not capture all of the properties that may be perceived to be important. It is used by the Smithsonian Institution's Global Volcanism Program in assessing the impact of historic and prehistoric lava flows.
As such, there is a discontinuity in the definition of the VEI between indices 1 and 2. The lower border of the volume of ejecta jumps by a factor of one hundred, from 10,000 to 1,000,000 m 3 (350,000 to 35,310,000 cu ft), while the factor is ten between all higher indices. In the following table, the frequency of each VEI indicates the ...
Ejecta is material that is ejected from an area, such as from a volcanic or stellar eruption. Ejecta may also refer to: Ejecta (band) ...
Single-layer ejecta craters only penetrate into the icy upper layer, as shown on the left. Multiple-layer ejecta craters go all the way through the icy layer and somewhat into the lower, ice-free layer (right). Another type of rampart crater is called a double-layered ejecta (DLE) crater. It displays two lobes of ejecta.
Rampart craters shows fluidized ejecta features. They look like mud was formed during the impact. There are several basic types of rampart craters. [2] The single-layered ejecta type has a single rampart at the edge of the ejecta. It is thought that these impacted into an icy layer, but did not go through the layer. [1] [3]
A widespread layer of ejecta, believed to be from the Acraman impact structure, is found within Ediacaran rocks of the Flinders Ranges at least 300 kilometres (190 mi) east of the crater, [3] and in drill holes from the Officer Basin to the north. [7] At the time these areas were shallow sea, and the ejecta settled into mud on the sea floor.