Meteor Essay

CHAPTER 2

LITERATURE REVIEW

2.0 Preface

A million years ago, earth was frequently visited by terrestrial object and hit repeatedly. Impact from meteor believes to be the major cause of extinction of animal species such as dinosaur, landscape and climate change. Huge impact changes the whole environment with its process during and after the impact. Suitable geophysical methods used in order to understand better on impaction and its operation. Some of the impact sites too became commercial exploration previously such as the Vredefort in South Africa for gold mining.

2.1 Literature review

Estimated there are approximately 25 million of meteor that enter the earth's atmosphere daily, which can be experienced through our unaided eye. There are more meteors in dim light comparable to those with bright ones. Scientific terms, meteoroid that enters Earth's atmosphere known as meteors. The meteor that survives through earth's atmosphere and fall on earth known as the meteorite (Norton and Chitwood, 2008).

Meteor is a makeup of asteroids, comets, moons and other bodies that have split apart (Parker, S., 2008). Meteoroid orbits the sun before entering the earth's atmosphere at speeds of 15 to 20 km/s. Meteor at such a hypervelocity, friction with encountered air till heat up their surface temperature to few thousands of Celsius. The smaller size of the meteor has a larger tendency of braking (Zanda and Rotaru, 2001). The meteor that successfully turned over close to the earth's surface could create huge air blasts such as the incident at Siberia in the year 1908 that leveled thousands of trees due to the explosion (Kusky and Cullen, 2010). The meteorite that well observes prior to impact known as “falls”, whereas meteorites that collects ...

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...y value > 6000 ohm-m. Granitic bedrock with >20000 ohm-m recorded in the second zone. The image of the 2-D resistivity also shows that the fractures and fault do occur in granitic bedrock and some poor rock quality region.

Fractures frequency and electric resistivity at the Lockne meteorite site located in Sweden was studied. The aim of the survey is to define the extent and radial changes of impact induced fracturing. Conduct of studies determines the effect of fractures on electric properties besides to correlate fracture frequency as well. The outcome of the results shows that fracture frequency decreases in the transition zone of impact structures. (Bäckström, 2005).

After seeing all possibilities of geophysical methods to distinguish the impact crater, seismic refraction method is the best option to optimize accuracy of survey site at Bukit Bunuh.

2.2 Summary