As we have seen, most earthquakes are essentially the product of tectonic stresses which are generated at the boundaries of the Earth's tectonic plates. The severity of an earthquake can vary from events which are barely detectable even using the most sophisticated devices, to devastating events which can level cities and trigger Tsunamis and sometimes even volcanic activity. The amplitude (height) of the largest recorded wave of an earthquake at a specific distance is called the Richter magnitude. Tectonic earthquakes can range in size from magnitudes less than zero, resulting from fault slippage of a few centimetres, to the largest events (magnitude greater than 9), where fault displacements are on the order of many metres.
There is no limit to the possible magnitude of an earthquake but historically just over magnitude 9 is the record. The seismograph has three main devices, the Richter Magnitude Scale, the According to the chart, large earthquakes will. Earthquakes happen when the moving tectonic plates that make up the surface of the Earth move apart or bump into each other, or slide under each other.
Several times a year, somewhere in the world there is enough movement to shake the earth a lot, and the earthquake knocks down buildings. The Richter scale (or ML scale) rates earthquakes on an exponential scale, so that if an earthquake is rated 1, you can hardly feel it, but an earthquake rated 2 is ten times as strong as an earthquake rated 1, and an earthquake rated 3 is ten times as strong as an earthquake rated 2.


A pen at the top of the device records a zig-zag line on the moving, paper-covered cylinder whenever an earthquake is detected. Under the Richter scale, each order of magnitude is 10 times more intensive than the last one, which means that a two is 10 times more intense than a one and a three is one hundred times greater. Earthquake size is determined not only by amount of displacement but also area of the ruptured fault plane.
The earthquake of most recent history to reach 9 on the Richter scale was the Japan quake of March 2011.
Earthquakes, including magnitude scales and the Gutenberg-Richter relation This is used when the values.
The 1906 San Francisco earthquake, with a magnitude of 8.3, was approximately one million times as powerful as the atomic bomb dropped on Hiroshima. They are very sensitive instruments that can detect, measure and record ground vibrations and their intensities during an earthquake. Various scales were proposed to measure the magnitude of earthquakes until 1935, when the Richter Scale was developed by a seismologist named Conrad Richter to measure the intensity of the seismic waves. But it is to point out that, while it is correct to say that for each increase in 1 in the Richter magnitude there is a tenfold increase in amplitude of the wave, it is incorrect to say that each increase of 1 in Richter magnitude represents a tenfold increase in the size of the earthquake (as is commonly incorrectly stated by the press).


The deeper the earthquake, the more powerful it is, but it is also far less likely to reach the surface. The earthquake triggered tsunami warnings and serious social media chatter, but resulted in little property damage and no known fatalities. A magnitude 7 earthquake ruptures a fault area of about 1000 km2 or about 50 km long and 20 km wide.
That’s why shallow earthquakes are more common and more dangerous, because the shallower an earthquake, the more damage to surface structures it can cause. Seismographs can help us determine the time, epicentre, focus, and the type of faulting which produced an earthquake as well as estimate how much energy was released.



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