Reducing Iran’s seismic activity in 1; we must be ready for the main earthquakes – | Iranian and world news

Mehdi Zare, in a conversation with Mehr reporter during the major earthquakes of the year, pointed to small earthquakes around Tehran and said: With two earthquakes with large magnitude 1 and 2.3 in Varamin city on March 5, the issue of earthquake in Tehran and its surrounding area returned to the public area. These small earthquakes were recorded about 2 kilometers southwest of Varamin on the borders of Tehran and Qom provinces and north of the Koushak Nasr Fault.

He continued: This area is about 2 kilometers south of Tehran. The fault systems in this zone are compressive with extending components. The two northwestern- south-east and east of the west come together.

The head of the earthquake forecasting center said the importance of the earthquake said: The earthquakes in the Javad Abad Varamin area, despite the large earthquake, were close to Tehran (2 kilometers southeast of Tehran in the summer earthquakes, and the earthquake. It is important to form a seismic cluster in the southern zone of the Pishva fault and to the north of the Koushak Nusrat fault in this area.

Referring to another earthquake in late March, he continued: Another important event in the last days of March was the earthquake of March 6, south of the Chengora Avaj in Qazvin province. In this area, according to the earthquake of the year 2, Bojin Zahra, and the Changor Earthquake (Avaj in Year 2), there is the possibility of a successive earthquake in the eastern -west fault zone in the south of Qazvin plain to northern Tehran.

Zare explained why the importance of consecutive earthquakes explained: Consecutive earthquakes are important due to the phenomenon of firing or disruption by the kinetic of a fault in terms of earthquake risk. The Eshtehard fault is located on the east side of the Epic fault, and on the other hand, the fault system reaches the east to the Mahdasht -South Fault, Karaj, and at its eastern end to the northern fault of Tehran. If we consider about 2 kilometers from Bouin Zahra to Tehran, the lack of seismic in the eastern parts of this eastern-western fault, especially south of Karaj and west of Tehran, should be taken seriously in Tehran and Karaj. The earthquake occurred in the westernmost part of the Eastern-West fault system.

This year no earthquakes with Big No more than 1 has been registered in Iran

He said that there was no earthquake in Iran in the year 3, adding that the Zagros Mountains, which is the most active seismic areas of the country, had a medium -sized earthquake of 1 to 2. In Iran this year, the earthquake was recorded and reported by more than 2, and no earthquakes with more than 1 occurrence occurred.

A member of the faculty of seismology in the southern Zagros region continued: A magnitude of 4.3 on January 5, 2008 at the Riz district on the border of Bushehr and Fars provinces, which was the beginning of a seismic cluster in the southern Zagros region.

He said: Earthquake events with a large size of 4.3 in the middle of the southern part of Lake Urmia (dried up) on January 5 were important events. Urmia Lake Drying and earthquakes in this seismic area of ​​Lake Urmia have been studied due to the issue of drying up this water zone over the past five years, as well as the issue of groundwater evacuation in East and West Azerbaijan, and two of my doctoral students are now focused directly on this issue.

Urmia Lake and earthquake -up association Khni

According to Zare; Groundwater discharge and the lake drying appear to have been effective in stimulating recent earthquakes in Lake Urmia, as well as the occurrence of earthquakes of 0.5 and 2 between September 1 and April 1 in Khoy.

The head of the earthquake forecasting center noted: Two years ago, on February 8, the largest earthquake from Khoy’s seismic cluster shook Khoy’s largest city. The earthquake was killed and about 2 people were injured and about 4 people were injured and about 4 people were injured on Saturday, February 8, 2009, 2 km from Khoy. The earthquake followed about 2 aftershocks, the largest of which occurred at 9:50 pm on February 9th with a magnitude of 4.3. These earthquakes frightened the people of Khoy and the suburbs.

The importance of seismic activities in Hormozgan region

“The two areas have witnessed numerous earthquakes because of their location on active faults,” he said. Due to its geographical location, the area is located in the Alps-Himalaya seismic belt and seismic activities are significant. Hormozgan region is of high economic and strategic importance due to the presence of important ports such as Bandar Abbas and Qeshm Island. The occurrence of major earthquakes in the area can cause significant economic damage.

Zare pointed to the earthquake of Masjed Suleiman in December and said: An earthquake with a large earthquake at 9:50 am on Thursday, December 5, in the village of Goligar Masjed Suleiman, was accompanied by two important dimensions in the first two hours after the occurrence (at 9:50 pm with a magnitude of 4.3 and at 9:50 pm). The earthquakes occurred at the same time as an earthquake with a magnitude of 4.3 killed one person and injured more than 5 people.

He continued: The earthquake mechanism of December 5 was a compressive fault close to the northwest-southeast direction and the depth was estimated at 2 kilometers so that the east / northeast of the fault shows upwards (to the west / southwest of the fault). Like the earthquake of the year, the fault is still the cause of the Ramhormoz fault, and in fact the occurrence of December 5 is similar to the repetition of the earthquake on July 9.

According to the head of the Earthquake Forecasting Center; Due to the young shell of this area, the events of earthquakes in this area are normal. In this area, there are unprecedented shell layers in Zagros and the pressure and stress that accumulates in the faults instead of being released in a fracture; It is released as a set of earthquakes called the earthquake. Ramhormoz fault kinely occurs under the kinetic of geological structures of stone, especially the Hormuz salt layer, and the salt layer follows the stone as an obstacle for fracture.

Garmsar earthquake wakes up the capital’s earthquake

Zare, referring to the Garmsar earthquake, which was felt in Tehran, said: Garmsar earthquake was on the evening of October 5, with a magnitude of 4.3, which occurred at 6:50 pm in Garmsar. This area in the crossroads of the northwest -southeast trends in the west of Alborz with the northeast -southwest trends in east Alborz and the place of gypsum and salt protrusion as salt domes (In the range of mountains Lady, Heat And it is Garmsar.

He said: Garmsar’s fault is intertwined with the Ivanki fault at its western end and is also seen in plastic deformation at the southeast end of Ivanki fault, and That’s why Fuji small earthquakes in this Section It is also seen from the Ivanki fault that the northwestern end of this Fault It reaches the district of Tehran. The feeling of this earthquake in Tehran was enough to write social media users on the subject, and that old fear of the earthquake in the capital would wake up, but it was not in Tehran.

A faculty member of the seismology research institute explained about why these earthquakes occur: Salt domes with their evaporative state of plastic deformity in this active area from the perspective of earthquakes and the release of energy in the faults and fractures of the fractures gradually become a medium deformity.

According to Zare; The Garmsar region has the largest salt mines in Iran and most of the salt extraction in the country is done. This salt area has a purity of more than 2 %. The height of the salt domes from the plain is about 1 to 2 meters.

He said that the maximum seismic power of the Garmsar fault is about 1.5, adding: Garmsar fault is intertwined with the Ivanki fault at its western end and is also seen in plastic deformation at the southeast end of the Ivanki fault, and therefore the small earthquakes are seen in this part of the Ivanki fault. The great is 1.2.

The earthquake professor explained about the earthquake history in Garmsar area: Garmsar in the year 2 of the earthquake with a magnitude of 4.3, in 1 Earthquake with magnitude of 4.3 and from 2 lot 1 Until November 6 1 (August 6 1 Until November 1), an earthquake with magnitude between 1 and 2 has occurred, the largest of which was two earthquakes with large 1. At this time of Garmsar earthquakes with limits 1 The earthquake with magnitude of more than 2 occurred. Six events in the year, and in the year 6, with the magnitude of more than 1 to 2.5, and seven earthquakes in the same area of ​​Garmsar occurred in the same area.

Seismic activity in 1 Reduced?

“The development of advanced seismic networks is crucial to monitoring seismic activities and predicting future earthquakes,” Zare said.

He explained the reason for the decline in seismic activity in year 2: Statistically reducing seismic activity in year 2 for medium to high earthquakes (1 or larger) in Iran can be attributed to many factors. Seismic activity is naturally fluctuated. Less seismic periods can be due to irregular propagation of earthquake stress and more active phases occur in the future.

Be prepared for severe earthquakes

He added: “In the average, the amount of deformation and stress of the Azizs are relatively stable, and if there are fewer earthquakes at a time, it is expected to compensate for the shortage in the months and years.” The earthquake occurs when the stress accumulated exceeds the strength of the rocks, and if it does not reach this threshold, fewer earthquakes occur and record.

The head of the earthquake forecasting center noted: Seismic relaxation or seismic abuses in important locks of main active faults lead to a period of relative silence between large seismic events; Therefore, we need to be ready for severe and major earthquakes in the coming months.