Alarm: Strong 6.4 magnitude earthquake! – News

An earthquake in Japan has caused an earthquake. 6.4 Richter, which took place on Monday morning of Easter (4/20) at the local time off the east coast of the country, without any problem at the moment. dead, damaged or a tsunami.

The epicenter was reported below the Pacific Ocean floor, about 41 miles (41.7 km) below the Pacific Ocean floor. 50 km from the coasts of Miyagi prefecture, according to the USGS data, according to which the risk of losing human lives or causing material damage is small. A similar earthquake occurred yesterday (4/19) in Indonesia.

No tsunami alert or tsunami alert was issued due to the earthquake. shortly after 5:30 p.m. (local time; 23:30 Greek time on Sunday), the Japanese news agency Kyodo reported.

Japan is on the call Pacific Ocean “Ring of Fire”, an arc in which intense seismic and volcanic activity is recorded and penetrates the basin of Southeast Asia and the Pacific.

In 2011, a 9.0 magnitude earthquake shook the archipelago, causing a massive tsunami that severely damaged areas of the northeast coast of Japan, killing nearly 16,000 people and destroying a nuclear power plant in Fukushima.

“Bell” by the seismologist: These are the most dangerous soils in Greece!

“Bell” from a seismologist who indicated which are the most dangerous soils in Greece! Greek seismologist Gerasimos Papadopoulos also launched a “bomb”, saying that “the country will face major earthquakes.”.

10% – 15% of the territories of the Greek territory, in several of which residential areas have been developed, are characterized by being lazy by scientists, as a result of which serious settlement phenomena can be created after an earthquake of al minus 5 degrees on the Richter scale, with incalculable tragic consequences for human life and property.

The liquidation phenomenon can lead to the collapse or even collapse of apartment buildings and other buildings, even very good constructions, which may not have suffered the slightest crack from seismic vibration. Spyros Pavlidis, professor emeritus of Neotectonics and Paleosismology in the Department of Geology at Aristotle University of Thessaloniki, told ethnos.gr, noting that loose soils are scattered throughout Greece.

“Loose soils can be sandy or clayey and there is definitely water in them. After an earthquake of at least medium size, such soil can behave like a liquid and a small sand volcano can form on the surface. The result is that the foundations of buildings and structures are affected, even if they are of very good construction, they can tilt or sink. We saw something like this recently in the earthquake in Albania. My former graduate student and today assistant professor at the Polytechnic School of the Thracian Democritus University, George Papathanassiou, did an excellent study and recording on the subject, “Pavlidis says on ethnos.gr.

Prone spots

According to the professor emeritus of the Aristotle University of Thessaloniki, a typical case is the city of Larissa, since in the network of the building there are several loose floors, which can cause settlement after the earthquake. The larger area around the Pinios River has a similar image.

In Thessaloniki prefecture, an area with many loose soils is that of the Anthemountas basin and mainly the Mikra area, which is located near the Thermaikos gulf. Today, the Macedonian airport “Thessaloniki” is located in it, which has heavy traffic every day.

Many loose soils are found in the coastal areas on the southern side of the Gulf of Corinth and mainly around Aigio, as well as in the Gulf of Patras, in the wider Andravida region and west of Patras. In Attica, many loose soils are found in the Mandra and Elefsina areas, as well as in Kineta, while a dangerous area in the southern Gulf of Evian is Skala Oropou.

With respect to northern Greece, an area with many loose soils is that of Polymylos Kozani, while similar phenomena are found in various areas around the points through which the TAP pipeline passes. Mr. Pavlidis’ scientific team studied geological phenomena in the entire area that TAP is currently experiencing, before its construction, from Evros to the Adriatic. The group found several loose soils in the Philippi and Krinides area, Kavala, as well as in the riparian areas of Axios, Strymon and Nestos. It should be noted that, according to Mr. Pavlidis, around 10% of the land through which TAP currently passes, is characterized by being loose and may present settlement phenomena.

“Both in the area around TAP and in it before Egnatia Odos was built, exhaustive studies of soils, faults, slopes, etc. were carried out. In fact, Egnatia Odos was built with the best road specifications, which are among the best in the world”. , notes Mr. Pavlidis.

Strong but expensive reinforcement

According to the professor emeritus of AUTh, there is an artificial possibility of strengthening the land, before doing any work, but this significantly increases the cost. The latter also increases significantly if engineers need to strengthen a building’s foundation if the ground is loose.

“Unfortunately, today such a thing only happens in large technical projects, as, for example, in the Amvrakikos link. In residential buildings this is not done and in its construction the engineer is forced to follow the specifications established by the current anti-seismic regulations. In some cases, however, its specifications are not sufficient.It should also be taken into account that although the anti-seismic regulation for the construction of buildings has been revised and enriched with new data every five years since 1980, since 2005 they have not been including new data, “stresses Pavlidis.