This article gives insight into why these events occur and what they mean. Included are some hair raising stories from Mt. The boom heard across much of Summerville, and the vibration that followed, was actually a little earthquake, the second this year in the area, according to Pete Jenkins, director of the Earthquake Center at Charleston Southern University.
Earthquake refers to a sudden violent shaking and vibration of the earth surface resulting from underground movement along a fault plane or from volcanic activity.
Earthquakes can cause serious destruction to property, injury to people and even kills. It happens when there is sudden movement or breaking of the tectonic plates.
The plates are usually marked by fractures or fault lines formed when the plates tear apart or slide or collide past each other. The shock waves can thrust up cliffs and open huge cracks on the ground leading to an earthquake event.
Earthquakes can be violent enough to toss people around and destroy whole cities. The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.
Thousands of minor tremors often take place just because of these constant movements. Earthquakes develop simply when the underground rocks plate tectonics unexpectedly break along fault lines.
Earthquakes are measured using observations from seismometers. Earthquakes are, thus, caused by tectonic plate movements, volcanic activity or underground explosions. Plate Tectonic Movements Plate tectonic movements cause the majority of the earthquakes.
The movements occur because the plates float on the hotter and denser rock of the mantle. When these plates rocks break or slide past each other at boundaries known as fault lines, they release shock waves.
After some period, the build up energy and movement generates great tensions in the plates and builds pressure on the fault lines. The intense pressure from the shock waves makes the fault lines to collapse, and the plates move over, up and against each other.
As a result, an earthquake occurs when the pressure build up along the fault lines becomes stronger than the force holding the tectonic plates together.
This happens when the rocks plates suddenly rip apart or fall on either side at ultrasonic speeds releasing the pent-up pressure which moves outward in all directions.
The rippling effect is what causes the rapid and violent vibration of the earth surface — earthquake, shaking and tearing everything on it including the earth surface itself, structures, and houses. Majority of the earthquakes originate along the edges of the plates and occur in some regions more frequently than others.
Earthquakes severity also differs depending on the amount of stored energy released and the extent of faulting. Geologists believe there is no regularity in the occurrence of earthquakes.
Aftershocks may as well be experienced after earthquake events. Aftershocks refer to smaller shock waves that result from the adjustment of the crust after the principal shock.
The aftershocks can worsen the aftermath of the disastrous earthquake outcomes. Volcanic Activity Apart from tectonic plate movements, volcanic activity can significantly cause massive earthquakes.
Earthquakes normally accompany escaping magma as it rises to the crust during a volcanic eruption. This is mainly due to the sudden displacement and shaking of underground rocks. Volcanic activity also creates fault lines and underground disturbances that can instigate the sudden ripping or falling of the tectonic plates, thus, releasing the pent-up pressure which moves outwards in all directions.
Underground Explosions Seismic waves wave shocks similar to the ones causing earthquakes can be generated by underground explosions. These explosions can be as a result of underground mining or during the construction of railroads, subways, or underground tunnels.
However, some of the seismic waves produced by these activities are not as strong as those produced by real earthquakes. Per se, they can only be felt within the adjacent areas. On the other hand, underground nuclear tests are known to be very dangerous and can produce powerful seismic waves similar to that of a natural earthquake.
For this reason, underground nuclear tests have been banned globally.Sep. 4, — Some of the clearest, most comprehensive images of the top several miles of the Earth's crust have helped scientists solve the mystery of why Mount St. Helens is located outside. Earthquakes can be violent enough to toss people around and destroy whole cities.
The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.” Causes of Earthquake. Almost every year, earthquakes are recorded in various parts of the world.
Watch video · The tower in northwestern Italy has managed to survive two world wars, millions of tourist visits and at least four strong earthquakes that have hit the region since , according to metin2sell.com Jun 11, · The journal Science is publishing the discovery, including detailed documentation of the forces involved in these iceberg calving events and an explanation for the causes of glacial earthquakes.
The research marks a major step toward the ability to measure the size of iceberg calving events in near real-time and from anywhere in the world. The mystery surrounding recent unexpected earthquake that ran across a large part of Southern Africa and had its epicenter in the Central Kalahari Game Reserve (CKGR) is beginning to unfold and while the Botswana Geoscience Institute in Lobatse claim it was caused by nothing other than natural causes, reports have surfaced alleging that .
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