Tags Posts tagged with "earth science"

earth science

- by - Published on
By Afroz Ahmad Shah The famous Portuguese Bend landslide in the summer of 1956, when people noticed that the ground beneath them had begun to move, remind us of the potential of such forces to move the ground (Figure, a). It is estimated that a 105-hectare (260-acre) section of the slope was breaking free at a rate of about 2.5 centimetres per day, and also carrying Portuguese Bend with it. However, by 1961, the rate had slowed to about 1 centimetre per day, but by then it already had destroyed or damaged about 154 homes within the slide area. Similarly,

- by - Published on
By Afroz Ahmad Shah As I have discussed in my previous article, that through the vast amount of evidences obtained from the earthquakes waves, meteorites, which fall on Earth, magnetic fields, some rare exposures of the deeper section of the Earth’s layers, and other physiochemical properties demonstrate that Earth is made up of three major layers, the crust, the mantle and the core. This stratification within the Earth was achieved through differentiation, which is a process by which materials are arranged in a sequence according to their densities. The Earth’s uppermost layer, the Crust is lighter and less dense. It

- by - Published on
By Afroz Ahmad Shah During any earthquake a large amount of strain energy is released, which travels as waves in all directions through the layers of the Earth, reflecting and refracting at each interface. The waves are called seismic waves or earthquake waves. These are similar to sounds waves, which are created through a disturbance in materials (media), for example when we talk to anyone, our voice disturbs the air and the energy is carried away from us towards the listener. This carries energy away from its point of origin. Similarly, when we throw a pebble in a pond, it

- by - Published on
By Afroz Ahmad Shah How do the earth scientists know the internal configuration of Earth? These people obviously cannot enter within the deeper sections of Earth; therefore, whatever we listen to or read about the internal structure of Earth is through indirect means. It is like an X-Ray of our body. The best way scientists have achieved it is through the paths and characteristics of seismic waves (Earthquake waves) travelling through the Earth. Today there are several other methods available to investigate the characteristics of the Earth’s internal arrangement. Based on these studies, the Earth is said to be composed

- by - Published on
By Afroz Ahmad Shah Earthquakes continuously pose unremitting threats to our young, 10,000-year-old, civilization. There are ample evidences to map a complete profile of vulnerabilities, which we have been facing in the recent past. The devastations of Acehnese and Thai coasts in 2004, of Kashmir and New Orleans in 2005, of southwest Java in 2006, of Sumatra again in 2007, western Sichuan and Myanmar in 2008, of Haiti in 2010, Japan, New Zealand and Turkey, in 2011, comprise an unremitting event of death and destruction. These disasters remind us of a desperate need to understand the basics of Earthquake Science

- by - Published on
By Afroz Ahmad Shah The geological records tell us that Earth is about 4.5 to 4.6 billion years old. This number is calculated by various vigorous scientific investigations, which deal with the dating of minerals and other records preserved within rocks. Accordingly, Earth has been divided into several geological time periods. Throughout its past, it has witnessed a number of changes, both minor and major, which are present within the rock strata. Geologists have studied these strata over decades and decoded the conditions of their formation and deposition. These strata also preserve evidences of faunal and floral changes. It has

STAY CONNECTED

83,733FansLike
14Subscribers+1
3FollowersFollow
1,545FollowersFollow