Monthly Archive: September 2017

Plate Margin Volcanism 0

Plate Margin Volcanism

There are two plate boundaries where volcanic activity takes place. Constructive Margin or Divergent Plate Boundary:     The asthenosphere, over which the lithosphere is floating, is mode of peridotite. A slight degree of melting...

Volcanism in Plate Tectonics 0

Volcanism in Plate Tectonics

 The worldwide distribution of volcanoes and their occurrence at specific places is related to different types of plate boundaries. Thus, volcanism in plate tectonics, will take place when two plates converge, as with the...

Types of Orogeny 0

Types of Orogeny

 Two major types of orogeny are recognized. A cordillerian type orogeny: which results from an episode of subduction in which geosynclinals sediments are severely deformed and intruded large volume of magma. A continental collision...

Orogeny 0

Orogeny

‘Orogeny’ this word derived from two Geek word i.e ‘Oros’  means ‘Mountain’ and ‘Gen’ means genesis. The word orogeny was coined by American geologist G.K Gilbert in 1890.  An orogen is the total mass...

Hazardous Effects of Earthquake 0

Hazardous Effects of Earthquake

It may be pointed that the intensity and effects of earthquake are not determined by the magnitude of seismic intensity as determined by Richter scale but are decided on the basis of quantum of...

Plate Tectonic Theory and Earthquke 0

Plate Tectonic Theory and Earthquke

Plate tectonic theory is the most acceptable theory for explanation of the causes of earthquakes. Slabs are composed of continental and oceanic crust. There are 6 major plates and 20 minor plates.  As these...

Causes of Earthquake 0

Causes of Earthquake

One of the causes of Earthquake is disequilibrium in any part of the crust of the earth. A number of causes of earthquake have been assigned to cause disequilibrium or isostatic imbalance in the...

World Distribution of Earthquakes 0

World Distribution of Earthquakes

Earthquakes are associated with the weaker and isostatically disturbed areas of the globe. Most of the world earthquakes occur in, The zone of young folded mountains. The zones of faulting and fracturing. The junction...

Classification of Earthquakes 0

Classification of Earthquakes

Each earthquake differs from each other and it really difficult to classify all the earthquakes into certain categories. In spite of these limitations classification of earthquakes is done on the basis of common characteristics...

What is An Earthquake? 0

What is An Earthquake?

An earthquake is a major demonstration of the power of the tectonic forces caused by endogenetic thermal conditions of the interior of the earth. ‘An earthquake is a motion of the ground surface, ranging...