Unknown things about earthquakes

Surely many people will be surprised to know that every year the earth suffers from about half a million earthquakes from mild earthquakes people do not feel the strong earthquakes that cause vibrations that cause disasters for humans.

The truth is little known about earthquakes

Earthquake in Kumamoto, Japan on April 14, 2016

March is not a month with lots of earthquakes

Many people believe that March is the time when earthquakes occurred most in the year. Indeed, on March 28, 1964, the American state of Alaska witnessed a seismic intensity of up to 9, .2 Richter levels. This is one of the strongest earthquakes in human history, but it only kills 125 people.

On March 9, 1957, the Andreanof Islands in the southern state of Alaska shook because of the seismic intensity of 9.1 on the Richter scale. However, the following three strong earthquakes in the US occurred in February, November and December. Super seismic in Chile appeared on February 27, 2010, while the 9.3-magnitude earthquake caused the carpet. The tsunami in the Indian Ocean in 2004 occurred in December.

500,000 earthquakes every year

This is the amount that the ultra-sensitive vibration measuring device records. People can sense about 100,000 earthquakes among them. About 100 earthquakes cause physical and material damage each year. In the southern state of California, scientists discovered about 10,000 seismic episodes each year, most of which were not felt by the people.

Urban moves because of shaking

The American city of San Francisco is moving toward Los Angeles at a rate of 5 cm per year - equivalent to the growth of human fingernails. The cause of the shift is the two San Andreas milling lines that are moving in opposite directions. The two cities will touch each other for several million years. Many people fear their movement will cause California to fall into the ocean, but scientists claim this will not happen.

The seismic day on February 27 in Chile caused the city of Concepcion to move more than 3 m to the west. Scientists also think that the earthquake changes the speed of the earth's rotation and makes it shorter.

The sun and moon cause earthquakes

Scientists have long known that the sun and the moon cause tides on the surface of the earth. Recently, some experts discovered that the attraction of these two bodies on the San Andreas milling line caused underground vibrations.

Weather does not cause seismic

According to the US Geological Survey, the number of earthquakes in areas with a hot and cold climate, rain seems to be nearly equal. Scientists say no weather has affected forces at a depth of a few kilometers underground, causing earthquakes to occur. The changes in atmospheric pressure in the atmosphere are often very small compared to the forces inside the Earth's crust. In addition, the effects of pressure cannot reach the underground.

The globe is more rounded because of the earthquake

The 9.3-magnitude seismic shock caused a tsunami on the Indian Ocean on December 26, that really changed a bit of the equator's convex. In that super-seismic battle , a huge amount of land was removed from the position, making the planet rounder.

90% of earthquakes occur on the Pacific Ring of Fire

The Pacific Ring of Fire is the area where the most seismic shaking in the world. This perimeter surrounds the Pacific Ocean, bordering the coasts of North America, South America, Japan, China and Russia. The majority of strong earthquakes occur on the Pacific fire belt when tectonic plates touch each other.

The largest seismic in the world occurs in Chile

On May 22, 1960, Chile witnessed an earthquake of magnitude 9.5 on the Richter scale. This is the strongest earthquake since humans invented a vibrating gauge.

Earthquakes on one side of the earth can shake the other side

Scientists studying earthquakes that caused tsunamis in 2004 found that the terrible earthquake weakened part of the famous San Andreas milling line. The most powerful earthquake in human history - occurred in Chile in 1960 - caused the earth to shake for many days.

The bloodiest earthquake happened in China

About 830,000 people were killed by the earthquake in Shaanxi Province, China on January 23, 1856.

Earthquake light

Mysterious lights in the sky before or during an earthquake

For centuries, earthquake witnesses reported that they saw mysterious lights appearing in the sky for a moment before or during an earthquake.

That light is described as a light, a blue flame or a pale rainbow appearing from the ground and sometimes about 200 meters high.

Before the 1960s, geologists ignored those reports and thought it was just an illusion , since no photo or video proved it.

However, that view was changed when in the mid-60s of the 20th century, when a series of earthquakes occurred in Nagano, Japan, gave geologists a great opportunity to consider and end Acknowledging this phenomenon.

Several theories have been proposed to explain the formation of these earthquakes . One of these includes the change of the earth 's magnetic field due to the piezoelectric effect (which occurs when the quartz stone at the tectonic stress field).

However, since the discovery does not always appear when earthquakes occur, these theories have not been further studied.

Liquefaction of rock

Most of us are familiar with quicksand, often appearing in movies or animation to swallow people.

In fact, quicksand is not as scary as we thought. However, another form of quicksand called liquefaction is really worth worrying about.

Along with tsunamis and landslides, liquefied soil is also one of the bad impacts of earthquakes. This phenomenon occurs when soil is not compacted or soil saturated with rainwater.

When impacted by strong earthquakes, reducing soil hardness and bonding. As a result, anything built on the ground (such as buildings, streets or vehicles) will sink or collapse.

This scenario was demonstrated in 1964, when the combination of an earthquake and liquefaction of the soil destroyed or damaged 16 534 houses in Niigata City , Japan.

Liquefied soil is also one of the bad impacts of earthquakes that cause houses and vehicles to sink or collapse

Storm the earthquake

The scene of buildings collapsing, those who die and are injured lie in the end of a horrifying earthquake.

Unfortunately, reality is not always the case, according to the theory of 'earthquake storms '. Created by Stanford University professor Amos Nur after studying earthquakes from the past, he thinks they are related.

This hypothesis suggests that an earthquake can cause a series of other earthquakes along the boundaries of tectonic plates. Subsequent earthquakes can occur months or even years later.

Nur's theory is illustrated by the large earthquakes that occur along North Anatolia Fault in Turkey from 1939 to 1999.

Of the 13 major earthquakes that occurred in this area, 7 occurred in a systematic way. Each earthquake took place just to the west of the previous earthquake on the same geological array.

Reelfoot Lake

Maybe you think earthquakes bring death and destruction, but that's not entirely true. Reelfoot Lake in Tennessee is an example of the positive impact of earthquakes.

Reelfoot was formed in New Madrid earthquakes that occurred in the Mississippi Valley between 1811 and 1812.

When an earthquake struck the area, some witnesses reported that they saw the Mississippi River flowing backward for a few hours. This phenomenon occurs by a "tsunami" battle on the river.

The earthquake also subsided about 1.5 to 1.9 meters deep on a large area, drawing water from rivers and creating a new era.

Over the years, the new lake has transformed into a natural habitat for a variety of plants and animals. Today, Reelfoot Lake is a famous place for boating and fishing.

Reelfoot Lake was formed in the New Madrid earthquake

Earthquakes caused by humans

Our impact does not stop in the air, the surface of the earth and the sea. It has a deep impact on the earth's crust, which is very vulnerable.

As we all know, earthquakes are often caused by the movement of geological arrays but human activity can also cause earthquakes with varying degrees of vibration.

One of the main causes of human earthquakes is the exploitation of liquid minerals , such as oil, water, deep drilling in the ground for industrial or environmental purposes.

Fluids increase pressure in cracks and can weaken the surrounding land. Once the pressure is large enough, the break points will slip, releasing pressure through the form of an earthquake.

Another cause of human earthquakes is groundwater exploitation , which caused a 2011 earthquake in Lorca.

The quake of the earthquake is the result of draining groundwater in the town. The dehydration then caused stress changes in the ground, eventually leading to earthquakes.

Earthquakes affect time

Besides moving the city, liquefying soil and rock, causing tsunamis . earthquakes also have the ability to make the earth spin faster.

That's what scientists at NASA observed after a 8.9-magnitude earthquake at the Japanese coast in 2011. Analysis data shows that strong pulses have increased the rotation speed of Earth, do a short day of 1.8 micro seconds.

This acceleration is caused by the redistribution of the planet's mass, with the larger mass moving closer to the equator.

It is not the only time the effect of changing time is recorded. The same thing happened at the Sumatra earthquake in 2004, which shortened 6.8 million of a second.

Strong pulses can increase the speed of the Earth's rotation

It happened again at the Chile earthquake in 2010, which increased the speed of the Earth's rotation by 1.26 milliseconds.

While these changes seem quite small, the cumulative impact of all future earthquakes may be significant.

Animals can predict earthquakes

In April 2009, British researchers discovered the special ability of toads - they could predict earthquakes . A species of toad was very popular before the earthquake in the Italian city of L'Anquila occurred on April 6, 2009, killing more than 300 people.

Belief in animal prediction ability has been around for centuries. In 373 BC, historians at the time recorded that rats, weasels and snakes conducted a mass exodus from an ancient city of Helice, Greece a few days before an earthquake broke out. completely cancel the city. Another example of the same period, historians have seen colonies move away from the nest, the catfish move violently and the chickens do not want to lay eggs. Pet and cat owners also witness their odd actions before the earthquake happens.