facts about earthquakes

5 Quick Facts About Earthquakes


First fact about earthquakes: how often they occur the magnitude

Facts about earthquakes. Every year there are more than 1 million earthquakes globally. They range in magnitude of less than 2.0 to 8.0+. The table below shows the average frequency & different magnitudes. There are approximately 80.000 earthquakes a month, 2.600 earthquakes a day & 2 earthquakes a minute. That is 1 every 30 seconds. Earthquakes happen everywhere and can be felt 1.000’s of miles away from where they originate from.

Description                          Magnitude        Frequency per year
Great                                     8.0+                      1
Major                                     7.0-7.9                 18
Large(destructive)                   6.0-6.9               120
Moderate(moderate damage)    5.0-5.9             1,000
Minor(damage)                       4.0-4.9             6,000
Generally Felt(light damage)    3.0-3.9            49,000
Perceptible(minor damage)      2.0-2.9            300,000
Imperceptible                        less than 2.0    600,000+

 

Second facts about earthquakes: the largest earthquake in the US

 

4 great earthquakes happened in central US between 16 December 1811 and 7 February 1812. All magnitudes were greater than 7.5 with the largest happening on 7 February 1812. They are called the New Madrid earthquakes. They were named after a town n Missouri and were felt as far away as D.C. & Boston.

The earthquakes were felt over an estimated 2 million square miles. The earthquakes created a large lake, several small lakes & formed waterfalls on the Mississippi River. The scary thing about these quakes is that they were far away from any plate boundary.  Which means, they can happen anywhere at anytime.

 

Third facts about earthquakes: power of an earthquake vs TNT

 

Earthquakes discharge a tremendous amount of power, which is why they can be so damaging. The chart below shows magnitudes with the approximate quantity of TNT considered necessary to emit the equivalent quantity of power.

Magnitude    Approximate TNT Energy
4.0              6 tons
5.0              200 tons
6.0              6,000 tons
7.0              200,000 tons
8.0              6,000,000 tons
9.0              200,000,000 tons

 

Forth facts about earthquakes: effects of earthquakes

 

The most familiar outcome of earthquakes is the shaking and displacement of the earth. When the earth displaces, there are commonly enormous structural damages. Structural damage can lead to fires. The breaking of electrical power lines or gas lines can spread fire fast. When water mains fracture, putting out the fire will become increasingly difficult.

Most likely, the most deadly effect of earthquakes are tsunamis. Tsunamis are enormous, lengthy waves caused by earthquakes. Tsunamis can trek thousands of miles across the ocean and destroy the shore line. Generally tsunamis occur in earthquakes measured at 7.5 on the Richter scale or higher. Floods can transpire as a second impact of earthquakes in situations where damns rupture. Earthquakes can also bring about what is known as soil liquefaction. Soil liquefaction happens when granular material temporarily loses its strength. When the granular material, such as sand, loses its strength, buildings that are on top of these locations could sink and crumple.

 

Fifth facts about earthquakes: Blind Faults

 

facts about earthquakes

 

Blind faults are faults that do not reach the surface of the planet. Generally, major faults in southern California reach and meet with the face of the Earth. This intersection of the fault plane with the surface makes a linear trait known as a fault trace or fault line. Low angle thrust faults are faults that do not reach the face of the Planet. Scientists refer to these as blind faults, and are continually in search of a new way to divulge them seeing as they can do as much damage as faults that are easily found on the surface. Blind thrust faults brought about the Northridge earthquakes and those earthquakes prove how hazardous that blind faults can be. A chain of low hills is a likely existence of a blind thrust fault. List of famous earthquakes can be seen on http://www.whatcausesearthquakes.com/famous-earthquakes.htm.

 


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