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To help prevent a roof from collapsing, builders make the roof out of light-weight materials.Outdoor walls are made with stronger and more reinforced materials such as steel or reinforced concrete.On the scale, 2 is scarcely noticeable, and magnitude 5 (or more) causes damage over a wide area. This can cause just as much death and destruction as the earthquake itself. Earthquakes are caused by tectonic movements in the Earth's crust.
To reduce stress, a building's ground floor can be supported by extremely rigid, hollow columns, while the rest of the building is supported by flexible columns inside the hollow columns.
Another method is to use rollers or rubber pads to separate the base columns from the ground, allowing the columns to shake parallel to each other during an earthquake.
This continues until the stress rises and breaks, suddenly allowing sliding over the locked portion of the fault. The San Andreas fault in San Francisco, and Rift valley fault in Africa are faults like this. Volcanic Earthquakes : Earthquakes which are caused by volcanic eruptions are quite devastating.
However, these are confined to areas of active volcanoes. Collapse Earthquakes : In areas of intense mining activity, often the roofs of underground mines collapse and minor tremors take place. There are three main types of geological fault that may cause an earthquake: normal, reverse (thrust) and strike-slip.
Similar to aftershocks but on adjacent segments of fault, these storms occur over the course of years, and with some of the later earthquakes as damaging as the early ones.
Such a pattern occurred in the North Anatolian fault in Turkey in the 20th century.A foreshock is an earthquake that occurs before a larger earthquake, called the mainshock.An aftershock is an earthquake that occurs after a previous earthquake, the mainshock.The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.So far, there have been sixty-two earthquakes in India.During an earthquake flexible windows may help hold the windows together so they don’t break.An earthquake is a sudden shaking movement of the surface of the earth. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to toss people around and destroy whole cities.Earthquake swarms are sequences of earthquakes striking in a specific area within a short period of time.They are different from earthquakes followed by a series of aftershocks by the fact that no single earthquake in the sequence is obviously the main shock, therefore none have notably higher magnitudes than the other.Seismology studies the cause, frequency, type and size of earthquakes. Large earthquakes can take down buildings and cause death and injury. The strength, or magnitude, of an earthquake, is measured using the Richter scale. They do know where earthquakes may occur, such as close to the fault lines.Earthquakes are measured using observations from seismographs. Earthquakes sometimes hit cities and kill hundreds or thousands of people.