Explanation of terms What is an epicenter? Explanation of earthquake magnitude terms

Epicenter, Hong Kong, Macao and Taiwan.

Called the epicenter, it refers to the position where the epicenter is projected vertically upwards to the ground when it occurs.

**The naming method is generally based on the more familiar neighboring place names where the epicenter is located, such as Taiwan 921 Jijida**, because Jiji is close to the epicenter, so Jiji is named; Another example is 512 Wenchuan.

Da**, also named after the epicenter of Wenchuan. Before the 20th century, the epicenter was generally determined by the geometric center method. The beginning of the 20th century, in ** Yi.

After the instrument technology gradually matured, the single measurement method and the network measurement method were born. Compared with the three, due to the influence of the inhomogeneity of the earth's crustal structure on the propagation of the first ray, the accuracy of the network measurement method is the highest, and the accuracy of the geometric center method is the lowest.

The closest point on the ground to the hypocenter is called the epicenter, and it is the earliest part of the ground to receive the shock.

**The most intense location is a point larger than the definition of the hypocenter.

The epicenter, also known as the epicenter location, is the vertical projection of the hypocenter source on the horizontal plane of the earth's surface, expressed in latitude and longitude. In fact, the epicenter is not a point, but an area.

The epicenter also has a certain range, which is called the epicenter area, and the epicenter area is the area with the strongest destruction. The ground distance from the epicenter to any ** station (station) is called the epicenter distance. There are generally two ways to determine the location of the epicenter:

The first is the post-earthquake investigation, which determines the most devastation as the epicenter, which is called the macroscopic epicenter; The other is the projection of the hypocenter on the ground according to the ** instrument, which is called the microscopic epicenter. Due to the influence of factors such as the physical state of the hypocenter area and the geological conditions of the ** area, the location with the greatest destructive power on the ground is not necessarily located directly above the epicenter, so the macroscopic epicenter does not necessarily coincide with the microscopic epicenter.

The hypocenter is in a vertical projection on the ground. **The distance from the observation point to the epicenter is called the epicenter distance, and the distance from the epicenter is less than 100 kilometers is called a local earthquake; At 100 1000 km is called a near-earthquake; More than 1,000 kilometers are called teleshocks. As the distance from the epicenter increases, the impact of ** decreases.

Explanation of magnitude.

earrhquake magnitude] indicates the magnitude of the energy released by the hypocenter Detailed explanation Divide the magnitude of the energy emitted by the hypocenter. The greater the amount of energy released, the greater the magnitude. The magnitude of the earthquake is divided into nine magnitudes, and people who are generally less than the magnitude have no feeling; Above the level of the person has feelings; ** above level 5 will cause damage.

Abbreviated as magnitude. Explanation of word breakdown ** Partial shaking or tremor of the earth, accompanied by orogeny or other crustal movements, explained in detail. Rapid changes in the earth's crust and shaking of the ground caused by changes in the earth's interior. Ancient is also known as ground movement.

In the history of our country, the earliest record of ** was found in the "Bamboo Book Chronicle" in the third year of Emperor B. "Spring and Autumn" Wen Gong Jiu Explanation of the magnitude of the earthquake indicates the size of the first time. It is a detailed explanation calculated from the records of seismic instruments to indicate the level of energy of the stool itself.

The greater the energy, the greater the magnitude. **The magnitude of the earthquake is classified as nine. For each magnitude difference, the energy difference is about 33 times.

The epicenter refers to the location of the source in the earth's crust at the time of the occurrence.

When ** happens, the rocks in the earth's crust crack and release energy under the action of ** waves, forming ** waves that propagate around. The epicenter is the geographic coordinate point that records the location of the occurrence of **.

The epicenter is usually expressed in terms of latitude and longitude on the surface of the earth and can be determined by the observation data of the instrument and the associated monitoring network. Depending on the location of the epicenter, the epicenter area can be delineated and the extent and intensity of the impact can be determined.

The identification of the epicenter is of great significance for the study and monitoring of **. It can help scientists understand the laws of crustal movement and activity, and the occurrence of the earth's crust. At the same time, the epicenter is also the basis for the development of disaster preparedness and emergency response to the state, which helps to reduce the losses and hazards caused by the state.

It should be noted that the epicenter and source of ** are not exactly the same. The epicenter remnant is the location where the energy is released, and the epicenter is the initial measured location of the wave on the surface. Due to factors such as the propagation of ** waves and observation errors, the hypocenter and epicenter may be slightly off.

The history of the word epicenter can be traced back to the origins of science. Science is the field of science that studies the activities of the Earth, which reveal the structure and movement of the Earth's interior by measuring, recording and analyzing the phenomena.

The word epicenter is used in science to refer to the central location or focal point of the occurrence, that is, the place where the epicenter occurs. It is determined based on the propagation and measurement data of the **wave. When it happens, the station records the arrival time of the wave, and by measuring data from several different stations and making calculations, scientists can determine the epicenter of the wave.

The history of the term can be traced back to the early 19th century, when science was still in its infancy, and scientists began to build observation networks and began to use different terms to describe phenomena. The use of the word epicenter in ** scientific research has gradually become a consensus and has been used to this day.

The above collapse content reference: Encyclopedia - epicenter.