When analyzing Centeral Asia seismicity the researchers noted that powerful earthquakes in the Hindu Kush, Altai and Northern Tien Shan are often grouped by three. Events in the first two regions can happen in the reverse order but the Northern Tien Shan earthquake always accompanies them. Within the last century, five groups of such events took place. The Hindu Kush earthquakes are deep-focus ones, they take place at the depths of 100 to 230 kilometers, in contrast to others, more shallow ones in the interior of the earth’s crust. It may take from 1.8 to 6.9 years from the first through the third earthquake in the group of three, while the interval between the second and the third earthquake makes up 20 days to a year and a half.
According to the researchers’ calculations, probability is rather high that within 100 years it was by chance that the pairs consisting of the Hindu Kush and the Altai earthquakes were formed for five times, but it is no way that groups of three earthquakes could accidentally happen for five times. Probability of such event makes about one of the hundred thousandth. Apparently, a group of three occurs as follows: first the Hindu Kush and the Altai earthquakes happen (in any succession but at the interval not exceeding six years), after which likelihood abruptly grows that a cataclysm will also take place in the region of the Northern Tien Shan within the next year and a half.
Why does the Northern Tien Shan regularly respond to the events that took place in the Hindu Kush and the Altai? According to the specialists’ opinion, the main reason is as follows. The lithosphere of the vast regions in Central Asia from the Hindu Kush and the Western Himalayas through the Altai and the Sayan Mountains is under the action of stresses caused by collision of the Indian and the Eurasian platforms. The stress field in the region is relatively homogeneous. After a pair of powerful earthquakes in the regions of the Hindu Kush and the Altai, the stresses redistribute, and as a result pressure increases between seismic event foci. The stresses should increase most of all exactly in the middle between them, just where seismic foci of powerful earthquakes of the Northern Tien Shan are located. Their energy is usually significantly lower than that of the first two events in the group of three, thus confirming the hypothesis of the Russian and Kazakhstan researchers.
The last group of three earthquakes that took place in 2002-2003 differs to some extent from the previous ones, mainly because after it, on October 8, 2005, there occurred one more very powerful crustal earthquake with seismic magnitude of 7.6 in the area of Kashmir, nearby the Hindu Kush zone. This was the most powerful earthquake for the last one hundred years within a radius of 600 kilometers from this zone. According to the specialists, this earthquake’s effect should be similar to the effect of the deep-focus Hindu Kush events. The researchers assume that there may happen one more event in the region of the Northern Tien Shan (its magnitude being about 6 and more) after a group of the 2002-2005 powerful earthquakes. The most probable time of the disaster is a year and a half after the Kashmir earthquake, that is approximately through April 2007. One of likely locations for this earthquake preparation is the region of the Kirghiz mountain ridge to the south-east of Bishkek. In 2004, two rather powerful deep events already took place there, which can be considered as forerunners of the impending cataclysm.
“By the way, an earthquake already happened in the mentioned region on December 25 last year, says Yuri Kopnichev, its magnitude being 5.8, which is practically in line with our forecast. It caused major destruction in Kochkor region of Kirghizia. Nevertheless, we expect that a more powerful event is to occur here.”
Nadezda Markina | alfa
Gas hydrate research: Advanced knowledge and new technologies
23.03.2018 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ
New technologies and computing power to help strengthen population data
22.03.2018 | University of Southampton
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
23.03.2018 | Event News
19.03.2018 | Event News
16.03.2018 | Event News
23.03.2018 | Materials Sciences
23.03.2018 | Agricultural and Forestry Science
23.03.2018 | Physics and Astronomy