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The 1811-1812 New Madrid earthquakes are a rare example of large earthquakes occurring in the middle of a plate, there was no plate boundary involved.
Transform fault
The result of two massive plates pushing against one another is that massive amounts of energy build up. Occasionally this energy is released suddenly in the form of large earthquakes.
Dams trigger tiny earthquakes as the ground under the reservoir adapts to the great weight of water added to it. There is no indication that these are causes of large earthquakes. Massive dams like Hoover Dam or Grand Coulee would have triggered huge earthquakes if this was the case. The largest killer earthquakes generally occur in places with no large dams.
Mars
Convergent boundaries where large scale thrust faulting occurs tend to have the largest magnitude earthquakes. For wxample the subduction boundary between the Pacific plate and the South American plate was responsible for the largest magnitude earthquake ever recorded (the magnitude 9.5 Valdivia earthquake that occurred in 1960 in Chile).
Large earthquakes (magnitudes greater than 8) are measured using the MMS (moment magnitude) scale. Small and moderate strength earthquakes (those with magnitudes less than 7) are measured using the Richter magnitude scale and earthquakes with magnitudes between 7 and 8 are measured using the Surface Wave magnitude scale.
The 1811-1812 New Madrid earthquakes are a rare example of large earthquakes occurring in the middle of a plate, there was no plate boundary involved.
Transform fault
Any type of plate boundary can cause an earthquake. That said, areas along convergent, divergent, and transform tectonic plate boundaries are the most likely places for earthquakes to occur.
The UK does have frequent small earthquakes, between 100-200 are detected each year. However because it is not near a tectonic plate boundary, large damaging events are unlikely to occur.
The Richter scale was originally developed to measure the strength or magnitude of moderate earthquakes (magnitudes less than 7). The surface wave magnitude scale was then developed by Richter and Guttenburg to allow larger earthquake magnitudes to be measured (up to 8). To measure large earthquakes the moment magnitude scale must be used. To measure the severity of earthquakes, the Modified Mercalli intensity scale is used in the US and the Macroseismic scale is used in Europe.
The place were two plates move past each other is called a transform boundary. This motion does not produce any mountains, but it can create large earthquakes.
Science records about 14,000 earthquakes in and around New Zealand each year. Most are small, but between 100 and 150 are big enough to be felt. The Institute records these earthquakes on a nationwide network of instruments called seismographs. New Zealand's position on the boundary of the Australian and Pacific plates is the reason for the large number of earthquakes.
Scientists are able to predict large earthquakes to a certain extent. With the use of certain statistical methods, many earthquakes are able to be predicted.
Large earthquakes - scientists predict they should happen every 80 years.
The result of two massive plates pushing against one another is that massive amounts of energy build up. Occasionally this energy is released suddenly in the form of large earthquakes.