EARTHQUAKES AND HUMAN ACTIVITIES

Earthquakes and Human Activities

Earthquakes and Human Activities

There are many geological hazards in the world affecting the lives of humans and their property, and earthquakes of the most causes of disasters as they occur suddenly and can cause considerable destruction and loss of life, earthquakes occur in seismic zones are known, which is what is known as belts of seismic, especially along the plate boundaries motor (tectonic) of the crust, where there are many active faults, and occur because of the pressure on the rocks, especially in the earth's crust, which allows the occurrence of sudden movements along cracks or faults, and lead to the emergence of pressure in the region in the form of many types of flexible seismic waves, which may result in the loss of lives and damage to property, most of these damages arise from tectonic earthquakes, which is mainly concentrated on the edges of plates, consisting of the crust.

In addition to this, the strength of earthquake is measured seismic energy liberated, or the devastation have on the Earth's surface directly above the epicenter. Measured strength of an earthquake or energy moves, including by recordings Alsesmojrav (STIS earthquakes), if the earthquake was less than five degrees on the Richter scale, can be felt by humans, but may not pose a threat significantly, and the devastating earthquakes so it is of magnitude more of 8 on the Richter scale, and intensity of shaking or impact that followed the earthquake is proportional to a certain extent, as measured scale Mercali Mercalli rate, divided into 12 degrees, to describe the intensity caused by earthquakes of different effects in different locations around the center of an earthquake, and is a useful means of mapping the affected areas, which may also reveal for information about the earthquake itself. If the reduction in the intensity of the earthquake is less than about 3 degrees it is likely to be felt by most people, but can be registered by the monitors earthquakes, dependent intensity of the devastation on the strength of the earthquake and the distance from the epicenter ((epicenter, and the depth of the earthquake, and the nature of the soil. It should be noted that the term "focus" (epicenter) refers to the location of the quake on the Earth's surface directly over the earthquake, while the "epicenter of the underground" ((hypocenters, is the location of the actual three-dimension, including in depth.

Landslides or land prices in certain areas resulting from the formation or the sinking of some islands or coastal areas.

Or both sides of the vertical displacement along the fault may cause the destruction of property.

Vibration of seismic waves can destroy or damage the facilities, which is not strong enough to withstand an offset side or vertically.

Landing ground or rocks falling from the tops of the mountains, as well as the decline in areas with caves or cavities under the ground, resulting in the destruction of facilities and infrastructure such as buildings and ...