Most Earthquakes Occur Along Plate Boundaries

However some parts of the Earth are more prone to earthquakes than others. Although these earthquakes are much less common they are due to the same forces that cause earthquakes along plate boundaries.

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While the process of forming these mountain ranges is volcanic volcanoes and earthquakes along oceanic spreading ridges are not as violent as they are at convergent plate boundaries.

. By definition intraplate earthquakes do not occur near plate boundaries but along faults in the normally stable interior of plates. 48 With the rapid growth of mega-cities such as Mexico City Tokyo and Tehran in areas of high seismic risk some seismologists are warning that a single quake may claim the lives of up to three million people. Stresses that occur at the plate boundaries in Table 1.

Most of the volcanoes and earthquakes on Earth happen where these plates meet. The types and nature of these waves are described in the section Seismic waves Because the size of earthquakes varies enormously it is necessary for purposes of comparison to compress the range of wave amplitudes measured. Massive earthquakes tend to occur along other plate boundaries too such as along the Himalayan Mountains.

Earthquakes Can Happen Along Intraplate Faults. There are also various divergent and transform boundaries in the area shown in Figure 119 and as weve seen in the mid-Atlantic area most of these earthquakes occur along the transform faults. Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges.

A map showing tectonic plate boundaries and the worlds most earthquake-prone zones. Convergent boundaries -- where crust is destroyed as one plate dives under another. According the theory of plate tectonics Earths outer shell is made up of a series of platesThe map above shows names and generalized locations of Earths major tectonic plates.

These plates move and interact with one another to produce earthquakes volcanoes mountain ranges ocean trenches and other geologic processes and featuresMap prepared by the United States. Earthquake magnitude is a measure of the size or amplitude of the seismic waves generated by an earthquake source and recorded by seismographs. Is found along the midocean ridges where new crust material is being created.

Most movement occurs along narrow zones between plates where the results of plate-tectonic forces are most evident. Use the three choices diagramed below. There are four types of plate boundaries.

Earthquakes can occur along faults far from the edges of plates. As the plates move past each other they sometimes get caught and pressure builds up. Movement in narrow zones along plate boundaries causes most earthquakes.

Most seismic activity occurs at three types of plate boundariesdivergent convergent and transform. Divergent boundaries -- where new crust is generated as the plates pull away from each other. Earthquakes happen along the edges of tectonic plates and fault lines and there are three large zones on our planet which are most susceptible to earthquakes.

The distribution of earthquakes with depth in the Kuril Islands of Russia in the northwest Pacific is shown in Figure 1110. These earthquakes often occur at the location of ancient failed rifts because such old structures may present a weakness in the crust where it can easily slip to accommodate regional tectonic strain.

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