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Why do we have earthquakes?
Places that are not along fault lines planes* in the earth would have very few earthquakes. +++ In particular, places far from subduction zones, in which one of the …Earth's crustal plates is being forced down below another. *A fault plane is the fracture with displacement itself. Its line is the trace of the fault plane's intersection with the land surface. There are no places on Earth that experience absolutely no earthquakes.
An earthquake can affect four spheres: The lithosphere, hydrosphere, atmosphere and biosphere. The lithosphere is the solid portion of the earth. The hydrosphere is the wate…r surrounding the earth (the ocean). The atmosphere is the air. The biosphere is the ecosystem of organisms. Earthquakes affect these by: Lithosphere: Shaking, ground rupture, landslides, avalanches, fires, forests destroyed, severe building damage. Hydrosphere: Tsunamis. Atmosphere: Gas emissions from ground release toxic gases into the atmosphere. Biosphere: Kills people, animals, disrupts ecosystem, destroys plantlife and crops.
The earthquake in Christchurch, NZ on the 22nd of February, 2011 was located just 4 or 5km underground. To put this in perspective, the quake in September, located near Christ…church was twice the depth, 10km below ground. So although the quake may have been 6.3 on the Richter Scale, it was a lot shallower than the one in September (7.3 on the Richter Scale), did a lot more damage and took many, many more lives. Hope this helps.
A low earthquake is 1-3 magnitude, a medium earthquake is 4-6 magnitude and a high earthquake is 7+ magnitude. No. A 7.0 magnitude quake would be considered a "major" quake.… Here is the scale of earthquake magnitude classes: Class | Magnitude / Great | 8 or more / Major | 7 - 7.9 / Strong | 6 - 6.9 / Moderate | 5 - 5.9 / Light | 4 - 4.9 / Minor | 3 -3.9
Earthquakes are tremors or vibrations in the Earth's crust that arecaused by the build up or accumulation of pressure (more correctlytermed stress). More: The Earth's crust,… or lithosphere (hard outer surface) is made upof "tectonic plates", or large plates. There are about 7 majorplates and many smaller plates, around 100 km thick, which sit upona lower soft layer (the asthenosphere). The tectonic plates arealways slowly moving, but they get stuck at their edges due tofriction. When the stress on the edge overcomes the friction, thereis an earthquake that releases energy in waves that travel throughthe earth's crust and cause the shaking that we feel. This accumulation of stress causes the rocks that make up the crustto deform elastically. This is very similar to what happens whenyou squash or stretch a spring and causes a form of energy to bestored in the rocks of the crust - technically described as elasticpotential energy. When this stress gets too large, it exceeds the strength of therocks in the crust and causes a brittle failure. Brittle failuresare failures where fractures form through the material. As thesehave been happening for a long time, the earth's lithosphere isalready fractured. These fractures are known as faults and as theserepresent zones of weakness within the lithosphere, it is alongfaults where the majority of earthquake occur when they slipsuddenly. This sudden brittle failure causes all of the elastic potentialenergy to be released at one time in the form of seismic waves,just as if a spring or elastic band that was being stretchedsuddenly snapped. These seismic waves cause the tremors that people feel on thesurface and which can cause damage to buildings and otherstructures. Please see the related links for more information. The Earth's crust, or lithosphere (hard outer surface) is made upof "tectonic plates", or large plates. There are about 7 majorplates and many smaller plates, around 100 km thick, which sit upona lower soft layer (the asthenosphere). When these plates move against each other along plate boundaries(where two plates meet) or along faults (a rift), an earthquakeoccurs. This may be through a variety of movements: sideways, upand down or apart. This causes anything upon the upper surface,above the earthquake, to also shift, whether they be buildings,roads, bridges, railways, etc. What you actually feel when you feel the shaking of an earthquakeare the seismic waves. There are three types of seismic waves and they are determined bythe properties of the rock through which they travel: P-waves (compressional waves) or primary waves are the first waves:they travel the fastest and can travel through everything. Then the S-waves (shear waves) or secondary waves come: they moveslower and cannot travel through liquids. At last the Surface-waves come. They are the slowest and they causethe biggest damage. Often it is when the surface-waves come thatthe buildings collapse. An earthquake describes when the earth moves the ground under yourfeet. It can slide it from side to side or move it a few feet inone direction. It can lift it up in one place and make it sink inanother. The results of this are quite visible in and nearAnchorage, Alaska. One street in that town shows where anearthquake make the ground fell. Driving south, dead trees stick upout of a lake where the ground fell below sea level. Earthquakesare caused when faults or cracks in the earth's shell suddenly slippast each other. When they jerk, they move a lot of land with them.That makes the earth tremble. Sometimes it damages buildings. The official definition for the word earthquake is "a sudden andviolent shaking of the ground, sometimes causing great destruction,as a result of movements within the earth's crust or volcanicaction." knowing these earthquakes happen almost everywhere they domost take place in the U.S in the state of California just a (FYI)
an earthquake is when two of the earth's tectonic plaits repsition or move. when an earthquake happens there are also normally aftershocks.also some move together to form a mo…untain or move apart to create crakes in the earh's surface. lastly they are VERRY dangerus normally there are a hundred people dead and mre missing. that is what an earthquake is.
The earthquakes after a major earthquake in the same area are called aftershocks.
Britain is usually considered to be earthquake free, yet occasionally, earth tremors are felt - so far nothing on the scale suffered by other countries.
Answer . 1. they shake the ground ... up and down or sidewise 2. the relieve the internal pressure that builds up as the tectonic plates move. . Here effects of an eart…hquakes:. Tsunami . A tsunami is a series of huge waves caused by an earthquake under the sea. These waves travel at about 800 km per hour. Before a tsunami reaches the shore, it slows down. The water along the shore recedes as if there were a very low tide. When the water comes back, the height of its waves may reach up to 30 m. It can destroy houses, crops and people as it goes inland and then back to the sea.. Seiche . An underwater earthquake can also generate a big wave in an enclosed body of water like a lake or a pond. This big wave which can be about 3 m high is called a seiche. A seiche can cause immediate flooding of areas near the lake.. Faulting . Strong earthquakes can also change the earth's surface. Cracks may form on the crust. When this happens, part of the crust may be displaced horizontally or vertically. In some cases, a section of the crust is raised above the section near it. Shallow gaps may also be formed on the crudt.. Landslide . Some earthquakes affect hilly or mountainous areas. Continiuous shaking of the ground changes the psition of some rocks or dislodges them. When these rocks roll downhill, they can destroy houses on their path or kill people.. Sand Blows . When an earthquake occurs in a place where there is much ground water, water is forced out of the ground in the form of an earthquake fountain. When this happens, sand is forced out and deposited on the ground in the form of volcanolike mounds. These are called sand blows.. Fire . Earthquakes can also cause fire. This happens when electric wires are destroyed and electric posts are upturned. Fire can easily spread to residential houses and other buildings.
The Kashmir Earthquake was affected by the destructive tectonic plate boundaries. Eurasian and Indian plate hitting each other. Thats what caused the Himalayas. Once, they hit… an earthquake occurs.
For the same place, yes, it is possible. This does not usually occur though, because most earthquakes will die off after a few minutes followed only by aftershocks. Once an …earthquake occurs it causes and imbalance in the forces along nearby fault planes increasing the likelihood that those will also rupture. In this sense small earthquakes can trigger larger ruptures or vice versa. This is why it is sometimes possible to predict future large rupture from fore-shocks depending on the known recurrence interval and estimated built up stress.
in Mt. St. Helens theree was one 1800's to 1850's
Earthquakes usually occur around faultlines or plate boundaries because that's where plates split apart a long time ago. When two plates collide they form earthquakes.
Shaking, things falling, buildings being damaged, foundations shifting, they can sometimes cause tsunamies if they are in a fairly large body of water, they can cause gas and …water lines to break, and they can cause liquifaction.
Because the Earth is an active planet driven by a molten core.
Volcanoes are not the primary cause of earthquakes. Most earthquakes result from the stresses created by tectonic plates moving past or against one another. At transform b…oundaries there is no mechanism to produce volcanoes, but the movement of the plates will still cause earthquakes. Stresses within a plate can also cause earthquakes.