Seismic event SFO. Online maps with monitoring of seismic activity of the earth

Every day, various areas of our planet are shaken by tremors. An earthquake is one of the natural disasters that humans cannot prevent.

The only thing he can oppose to the indomitable forces of nature is the achievements of science in the field of forecasting. Systematization and monitoring of seismic activity makes it possible to avoid casualties and destruction in a timely manner, as well as to identify areas of the greatest seismic activity.

The Earth's seismicity map is a physical map of the planet that shows areas where earthquakes greater than 4 on the Richter scale have occurred over a certain period of time. The map uses the following conventions: the diameter of the area is proportional to the power of the tremors, and the color of the circle indicates the time interval. For example, red areas correspond to earthquakes occurring on the current date or in real time.

Seismic monitor, updated every 20 minutes


red circles - earthquakes in the last 24 hours
orange circles - earthquakes in the last 1-4 days
yellow circles - earthquakes in the last 4-14 days

The map of seismic activity of the world allows you to select an area of ​​the earth's surface by clicking the mouse button. In this case, the selected area will be separately displayed in the window, in which the epicenters of earthquakes are indicated in detail. The online seismic monitor allows you to obtain comprehensive data when selecting any source. The table shows the coordinates of the epicenters and the power of tremors, ranging from 24 hours to 30 days. The seismic recording stations located in the selected area are also displayed on the map of the area.

List of earthquakes

To return to the beginning of the document, press Backspace or Back to the earthquake list

Seismic activity map online, updated every 20 minutes. In addition, you can always find out whether there was an earthquake today or not. This allows you to more clearly evaluate the information provided.

The images below are from IRIS, a non-profit organization founded in 1984 with support from the National Science Foundation and a consortium of more than 100 US universities dedicated to the study, organization and distribution of seismological data. IRIS programs are aimed at scientific research, education, and reducing the consequences of earthquakes.

In the data below, the time is indicated in UTC (Coordinated Universal Time), to convert to Moscow, add 4 hours.

This map shows the Pacific Ocean, as well as the eastern regions of Russia - the Far East and the Kuril Islands. The fault line of the Pacific ridge is clearly visible.


Seismic activity in Russia and Central Asia


Map of seismic activity in Russia and Europe

The destructive power of an earthquake depends on its magnitude (at the hypocenter, i.e. at the source), the depth of the earthquake source and the distance from the epicenter (the point of projection of the source onto the surface of the earth).

Examples of media reports and explanations of terms:
"According to ***, there, at such and such Moscow time, an earthquake occurred magnitude in the outbreak M=4.3 points on the nine-point Richter scale, at a depth of 15 km from sea level.
The epicenter of the earthquake was located 100 kilometers southeast of the city ***. Tremors were felt in the village of *** by force up to four points, and in the city of *** - three points (on a 12-point scale). According to the latest data, there are no casualties or serious damage. Over the course of a week, 4 earthquakes with a magnitude of 2.3 to 4.3 on the Richter scale were recorded in the indicated area, which were also felt in neighboring regions. According to statistics provided by seismologists, the average interval between series of earthquakes with a magnitude of up to four in this area is approximately *** years."

Or
“An earthquake with a magnitude of 4.3 at the source occurred there. Its epicenter was located one hundred kilometers southeast of the city ***. The depth of the source was 15 km” from sea level.

Or
The four-point earth happened today somewhere.

The magnitude of an earthquake (not to be confused with “strength”, and leave the points alone) - quantitatively characterizes its energy at the source, on a nine-point Richter scale (0-9). It is calculated from the results of measurements by instruments (seismographs) at the seismic stations closest to the epicenter in different countries. An earthquake with a magnitude of 6.0 or higher, with a nearby epicenter and a shallow source, is considered strong and can cause significant destruction and lead to casualties among the population, especially if buildings and residential structures are not designed for proper seismic resistance or were built by low-skilled migrant workers, with rough violations of construction norms and rules.

The strength of earthquake tremors (intensity) is a qualitative (felt, visible) characteristic of the degree of destruction and other manifestations on the earth’s surface, at a specific point on the earth’s surface. For this, a twelve-point scale (1-12) or a modified Mercalli scale is used. They differ little. The real danger comes from tremors with a force of four or more.

Forecast. Before a strong earthquake, a few minutes or even hours later, domestic animals and birds begin to scream and rush around, trying to run away from the house to the street, to hide. The dogs are trying to take their owners and children to a safe place. Cats carry kittens away. Aquarium fish are worried, trying to jump out of the water of the aquarium. Rats and mice are running outside from the basements of houses. Wild animals, in advance - several hours or days before the earthquake, leave the dangerous area in packs. Snakes and lizards crawl out of their holes (even in winter, at night and in bad weather), Birds constantly scream, fly in circles for a long time and randomly. Animals and birds lose their appetite, their behavior changes greatly - they, without attacking each other, move away from danger together.

Those who were born, raised and lived (in natural conditions) in earthquake-prone areas have the best sensitivity. The skill lasts a long time. Their reaction is more often selective, only to close (local earthquakes) and dangerous in strength (more than two to four points).

Seismologists and volcanologists use scientific, instrumental forecasting methods and early warning methods: constant monitoring of seismic activity with a network of sensitive sensors, regular measurements and detection of increases in the concentration of helium and radon in the surface air and at depth, etc.

Dependence of earthquake intensity. from the distance to the epicenter. From nearby epicenters of earthquakes of great strength (if a “seven” magnitude or higher strikes), very sharp shocks and impacts, intense shaking are felt, glows and sparks are visible, an underground rumble, crackling and roar of collapsing buildings and falling, broken trees is heard, a sharp increased wind. At distances of hundreds of kilometers from the epicenter, echoes of an earthquake reach - low-frequency, relatively slow vibrations, wave-like swaying of the earth's surface during the day. The farther away, the smaller their vertical amplitude and the longer the period (up to a minute or more, at a distance to the epicenter of several thousand kilometers), with the exception of anomalously intense and resonant manifestations at certain distances from the epicenter and along large, deep tectonic faults.

Influence of tidal (gravitational) effects. Seismicity increases - during the new moon and, especially, during the full moon, as well as when the Moon is at perigee (closer to the Earth). There is also a seasonal dependence: in autumn and, especially, in winter, it shakes stronger and more often than in spring and summer.

Geological factor. The greatest destruction from an earthquake occurs at rocky outcrops and if they are covered with loose sediments of small thickness, which are thrown up at their base. Safer ground conditions are areas with thick layers of loose rocks. rocks in which the seismic wave weakens and is extinguished until it reaches the earth's surface.

Tsunamis occur if the epicenter of the earth is located near the sea coast. At the first impact, the water first moves away from the shore, and then, accelerating, hits the coast in the form of a large wave. The brightness of the glow of marine organisms increases sharply two to three minutes before the tsunami.

red - last 24 hours
orange - last 1-4 days
yellow - last 4-14 days

red - last 24 hours
orange - from 24 to 48 hours
yellow - for the last 3-17 days
purple - from 2 weeks to 5 years

Tabular data for the selected period:
http://www.emsc-csem.org/index.php?page=current&sub=list

Excellent map, a direct analogue of Google planets with attached KML files
http://www.oe-files.de/gmaps/eqmashup.html

Shows the last 15 earthquakes

Scientists have compiled a map of the largest tectonic plates:

• Australian;
• Arabian subcontinent;
• Antarctic;
• African;
• Hindustan;
• Eurasian;
• Nazca Plate;
• Plate Coconut;
• Pacific;
• North and South American platforms;
• Scotia Plate;
• Philippine plate.

From theory we know that the solid shell of the earth (lithosphere) consists not only of plates that form the relief of the planet’s surface, but also of the deep part - the mantle. Continental platforms have a thickness from 35 km (in flat areas) to 70 km (in mountain ranges). Scientists have proven that the slab is thickest in the Himalaya region. Here the thickness of the platform reaches 90 km. The thinnest lithosphere is found in the ocean zone. Its thickness does not exceed 10 km, and in some areas this figure is 5 km. Based on information about the depth at which the earthquake epicenter is located and the speed of propagation of seismic waves, the thickness of sections of the earth's crust is calculated.

The map shows the locations of seismically hazardous zones. The zones are highlighted in color - from green to red. The closer the color is to red, the higher the likelihood of strong and destructive earthquakes. The map was created using data from earthquakes that occurred since 1973.
Nuclear power plants are shown on the map. The location of a nuclear power plant in a seismic zone increases the danger to the population.

Gradation of danger. Enable/Disable

| >>> Seismic monitor (superimposed on the map) | >>> USGS Seismic Monitor (superimposed on the map) | >>>Seismic monitor (clickable map) | >>>Seismic monitor EUROPE |

Seismic activity map online, updated every 20 minutes. In addition, you can always find out whether there was an earthquake today or not. This allows you to more clearly evaluate the information provided.

The map of seismic activity of the world allows you to select an area of ​​the earth's surface by clicking the mouse button. In this case, the selected area will be separately displayed in the window, in which the epicenters of earthquakes are indicated in detail. The online seismic monitor allows you to obtain comprehensive data when selecting any source. The table shows the coordinates of the epicenters and the power of tremors, ranging from 24 hours to 30 days. The seismic recording stations located in the selected area are also displayed on the map of the area.

Earthquakes are a terrible natural phenomenon that can bring numerous disasters. They are associated not only with destruction, which may result in human casualties. The catastrophic tsunami waves they cause can lead to even more disastrous consequences.

Which areas of the world are most affected by earthquakes? To answer this question, you need to look at where the active seismic areas are. These are zones of the earth's crust that are more mobile than the surrounding regions. They are located at the boundaries of lithospheric plates, where collisions or separation of large blocks occur. It is the movements of powerful rock layers that cause earthquakes.

There are several belts on the globe that are characterized by a high frequency of underground impacts. These are seismically dangerous areas.

The first of them is usually called the Pacific Ring, since it occupies almost the entire ocean coast. Not only earthquakes, but also volcanic eruptions are frequent here, which is why the name “volcanic” or “ring of fire” is often used. The activity of the earth's crust here is determined by modern mountain-building processes.

The second large seismic belt stretches along the high young from the Alps and other mountains of Southern Europe and to the Sunda Islands through Asia Minor, the Caucasus, the mountains of Central and Central Asia and the Himalayas. The collision of lithospheric plates also occurs here, which causes frequent earthquakes.

The third belt stretches across the entire Atlantic Ocean. This is the Mid-Atlantic Ridge, which is the result of the spreading of the earth's crust. Iceland, known primarily for its volcanoes, also belongs to this belt. But earthquakes here are by no means a rare phenomenon.

Earthquakes also occur in our country. Seismically active regions of Russia are the Caucasus, Altai, the mountains of Eastern Siberia and the Far East, the Commander and Kuril Islands, Fr. Sakhalin. Tremors of great force can occur here.

One can recall the Sakhalin earthquake of 1995, when two-thirds of the population of the village of Neftegorsk died under the rubble of destroyed buildings. After the rescue work, it was decided not to restore the village, but to relocate the residents to other settlements.

In 2012-2014, several earthquakes occurred in the North Caucasus. Fortunately, their sources were located at great depths. There were no casualties or serious damage.

The map shows that the most seismically dangerous areas lie in the south and east of the country. At the same time, the eastern parts are relatively sparsely populated. But in the south, earthquakes pose a much greater danger to people, since the population density here is higher.

Irkutsk, Khabarovsk and some other large cities are in the danger zone. These are active seismic areas.

Seismically active areas occupy approximately 20% of the country's territory. But this does not mean that the rest is completely insured against earthquakes. Shocks with a force of 3-4 points are observed even far from the boundaries of lithospheric plates, in the center of platform areas.

At the same time, with the development of the economy, the possibility of anthropogenic earthquakes increases. They are most often caused by the collapse of the roof of underground voids. Because of this, the earth's crust seems to shake, almost like a real earthquake. And there are more and more voids and cavities underground, because people extract oil and natural gas from the subsoil for their needs, pump out water, build mines for the extraction of solid minerals... And underground nuclear explosions are generally comparable to natural earthquakes in their strength.

The collapse of rock layers in itself can pose a danger to people. Indeed, in many areas, voids form directly under populated areas. Recent events in Solikamsk have only confirmed this. But even a weak earthquake can lead to dire consequences, because as a result it can destroy structures that are in disrepair, dilapidated housing in which people continue to live... Also, violation of the integrity of rock layers threatens the mines themselves, where collapses can occur.

People are not yet able to prevent such a terrible phenomenon as an earthquake. And they haven’t even learned to predict exactly when and where it will happen. This means you need to know how you can protect yourself and your loved ones during tremors.

People living in such dangerous areas should always have an earthquake plan in place. Since a disaster may find family members in different places, there should be an agreement on a meeting place after the tremors stop. The home should be as safe as possible from falling heavy objects; it is best to attach furniture to the walls and floor. All residents should know where they can urgently turn off gas, electricity, and water in order to avoid fires, explosions and electric shocks. Stairs and passages should not be cluttered with things. Documents and a certain set of products and essentials should always be at hand.

Starting from kindergartens and schools, the population needs to be taught the correct behavior in case of a natural disaster, which will increase the chances of salvation.

Seismically active regions of Russia place special demands on both industrial and civil construction. Earthquake-resistant buildings are more difficult and expensive to build, but the cost of their construction is nothing compared to the lives saved. After all, not only those who are in such a building will be safe, but also those nearby. There will be no destruction and rubble - there will be no casualties.

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Images reminiscent of a disaster movie have emerged in the final hours from the island of Sulawesi in Indonesia. After a powerful earthquake, a tsunami hit him: the wave swept away everything in its path - houses and roads were destroyed, ships were overturned. At the epicenter is a city inhabited by more than 300 thousand people. At the moment, the death toll is approaching fifty, and this figure is unlikely to be final.

People gathered on the balcony of this building to film the destruction and at the same time look at the raging ocean. Moreover, before this, the threat of a tsunami after the earthquake was removed. Within a few seconds the wave becomes higher and more powerful. Panic, screams are heard, then the phone falls from the owner’s hands.

The fate of these people is unknown. Rescue services cannot yet say even approximately how many people became victims of the tsunami. But we are definitely talking about dozens.

Hospitals in the city and its surroundings are overcrowded. Help for victims is provided right on the streets. The number of wounded, according to preliminary data, is close to five hundred.

“We are sending medical teams from around the area, the Marine Corps and the Army, as well as members of the national search and rescue agency,” said Indonesian National Armed Forces commander Hadi Tzhanjanto.

The cause of the tsunami, which was so underestimated, was a series of earthquakes. After the first one, with a magnitude of 6, a more powerful, repeated one, with a magnitude of 7.7, occurred. And even a whole series of aftershocks. The strength of the tremors can be assessed from CCTV footage. During prayer, people did not immediately understand what was happening. They began to sway sharply from side to side. Hundreds of homes have been destroyed throughout the region. The ships washed ashore. Huge cracks in the asphalt. A horrific photo spread across the world's media: a man holding his dead child in his arms. In the background is all that remains of their home.

“I and all our people express our condolences for the earthquake and tsunami that hit Palu and its surrounding areas. We will use all resources to resolve the consequences of the disaster as quickly as possible,” Indonesian President Joko Widodo.

Such natural disasters are not uncommon for residents of Indonesia. The islands are located at the junction of tectonic plates, in an area of ​​increased seismic and volcanic activity. Not long ago, the popular tourist island of Lombok was hit by two powerful earthquakes. Then a total of more than five hundred people died, and about one and a half thousand were injured.