ERTH 2415 Lecture Notes - Lecture 3: Impact Structure, Pingualuit Crater, Manicouagan Reservoir
19 Jan 2017
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Document Summary
Craters bigger then 5 km are big craters and do not contain meteorites. Rim rocks are tilted away from crater. Shatter cones: striations radiating from the apex of host rock. Meteorites may be found within the impact site. No special alignment of the earth that guides meteorites to specific areas of earth. Erth 2415: places with several craters are normally due to a large quantity of old rocks. Ex: why not craters on the west coast of. Very young racks with less chance of impact, very active tectonic plates: sudbury crater: normally round shaped but die to movement of faults in the earth it is more oblong. Canada: wanapiei crater: within the original limits of the. Gravity varies by very small amounts at different locations on the surface of the earth because of heterogeneities in the surface. Gravimeter: map heterogeneities in the surface: site of impact is less dense then the surrounding area.
