what causes an earth quake???
An Earthquake is a sudden tremor or movement of the earth's crust, which originates naturally at or below the surface. The word natural is important here, since it excludes shock waves caused by French nuclear tests, man made explosions and landslides caused by building work.
they are 2 main causes of earthquakes .
Firstly, they can be linked to explosive volcanic eruptions; they are in fact very common in areas of volcanic activity where they either proceed or accompany eruptions.
Secondly, they can be triggered by Tectonic activity associated with plate margins and faults.
An Earthquake is a sudden tremor or movement of the earth's crust, which originates naturally at or below the surface. The word natural is important here, since it excludes shock waves caused by French nuclear tests, man made explosions and landslides caused by building work.
they are 2 main causes of earthquakes .
Firstly, they can be linked to explosive volcanic eruptions; they are in fact very common in areas of volcanic activity where they either proceed or accompany eruptions.
Secondly, they can be triggered by Tectonic activity associated with plate margins and faults.
what kind off damage does a earthquake cause??????
Sometimes it is nothing worse than a few pictures shaken off the walls. In a major quake, buildings and bridges collapse, landslides and rockslides occur, cracks open in the ground, utility poles fall cutting off electrical and telephone service, gas lines burst starting major fires, and water lines rupture.
it causes very dangerous damage,like house faliing down,and also such as people dying.
Sometimes it is nothing worse than a few pictures shaken off the walls. In a major quake, buildings and bridges collapse, landslides and rockslides occur, cracks open in the ground, utility poles fall cutting off electrical and telephone service, gas lines burst starting major fires, and water lines rupture.
it causes very dangerous damage,like house faliing down,and also such as people dying.
what kind of earthquakes are there ??Interplate earthquakes occur along the three types of plate boundaries: (1) mid-ocean spreading ridges, (2) subduction zones, and (3) transform faults.Mid-ocean spreading ridges
Mid-ocean spreading ridges
Mid-ocean spreading ridges are places in the deep ocean basins where the plates move apart. As the plates separate, hot lava from Earth's mantle rises between them. The lava gradually cools, contracts, and cracks, creating faults. Most of these faults are normal faults. Along the faults, blocks of rock break and slide down away from the ridge, producing earthquakes.
Near the spreading ridges, the plates are thin and weak. The rock has not cooled completely, so it is still somewhat flexible, thus large strains cannot build, and most earthquakes near spreading ridges are shallow.
Subduction zones
Subduction zones are places where two plates collide, and the edge of one plate pushes beneath the edge of the other in a process called subduction. Because of the compression in these zones, many of the faults there are reverse faults. About 80 per cent of major earthquakes occur in subduction zones encircling the Pacific Ocean. In these areas, the plates under the Pacific Ocean are plunging beneath the plates carrying the continents. The grinding of the colder, brittle ocean plates beneath the continental plates creates huge strains that are released in the world's largest earthquakes.
Faults are divided into three main groups. Reverse fault - when two plates collide and one side of the fracture moves on top of another; normal fault -when two plates are moving apart; and strike-slip or lateral - when two plates slide past each other.
In a normal fault, the block of rock on the upper side of the sloping fracture slides down. In a reverse fault, the rock on both sides of the fault is greatly compressed. The compression forces the upper block to slide upward and the lower block to thrust downward. In a strike-slip fault, the fracture extends straight down into the rock, and the blocks of rock along the fault slide past each other horizontally.
As the tectonic plates move about on the asthenosphere, they interact with one another at their boundaries. There are three types of boundaries: (1) divergent, where plates move apart from each other, (2) convergent, where plates move toward each other, and (3) transform, where plates slide alongside each other.
Faults are divided into three main groups. Reverse fault - when two plates collide and one side of the fracture moves on top of another; normal fault -when two plates are moving apart; and strike-slip or lateral - when two plates slide past each other.
In a normal fault, the block of rock on the upper side of the sloping fracture slides down. In a reverse fault, the rock on both sides of the fault is greatly compressed. The compression forces the upper block to slide upward and the lower block to thrust downward. In a strike-slip fault, the fracture extends straight down into the rock, and the blocks of rock along the fault slide past each other horizontally.
As the tectonic plates move about on the asthenosphere, they interact with one another at their boundaries. There are three types of boundaries: (1) divergent, where plates move apart from each other, (2) convergent, where plates move toward each other, and (3) transform, where plates slide alongside each other.
Mid-ocean spreading ridges
Mid-ocean spreading ridges are places in the deep ocean basins where the plates move apart. As the plates separate, hot lava from Earth's mantle rises between them. The lava gradually cools, contracts, and cracks, creating faults. Most of these faults are normal faults. Along the faults, blocks of rock break and slide down away from the ridge, producing earthquakes.
Near the spreading ridges, the plates are thin and weak. The rock has not cooled completely, so it is still somewhat flexible, thus large strains cannot build, and most earthquakes near spreading ridges are shallow.
Subduction zones
Subduction zones are places where two plates collide, and the edge of one plate pushes beneath the edge of the other in a process called subduction. Because of the compression in these zones, many of the faults there are reverse faults. About 80 per cent of major earthquakes occur in subduction zones encircling the Pacific Ocean. In these areas, the plates under the Pacific Ocean are plunging beneath the plates carrying the continents. The grinding of the colder, brittle ocean plates beneath the continental plates creates huge strains that are released in the world's largest earthquakes.
Faults are divided into three main groups. Reverse fault - when two plates collide and one side of the fracture moves on top of another; normal fault -when two plates are moving apart; and strike-slip or lateral - when two plates slide past each other.
In a normal fault, the block of rock on the upper side of the sloping fracture slides down. In a reverse fault, the rock on both sides of the fault is greatly compressed. The compression forces the upper block to slide upward and the lower block to thrust downward. In a strike-slip fault, the fracture extends straight down into the rock, and the blocks of rock along the fault slide past each other horizontally.
As the tectonic plates move about on the asthenosphere, they interact with one another at their boundaries. There are three types of boundaries: (1) divergent, where plates move apart from each other, (2) convergent, where plates move toward each other, and (3) transform, where plates slide alongside each other.
Faults are divided into three main groups. Reverse fault - when two plates collide and one side of the fracture moves on top of another; normal fault -when two plates are moving apart; and strike-slip or lateral - when two plates slide past each other.
In a normal fault, the block of rock on the upper side of the sloping fracture slides down. In a reverse fault, the rock on both sides of the fault is greatly compressed. The compression forces the upper block to slide upward and the lower block to thrust downward. In a strike-slip fault, the fracture extends straight down into the rock, and the blocks of rock along the fault slide past each other horizontally.
As the tectonic plates move about on the asthenosphere, they interact with one another at their boundaries. There are three types of boundaries: (1) divergent, where plates move apart from each other, (2) convergent, where plates move toward each other, and (3) transform, where plates slide alongside each other.