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The inhabitants of Thessaly they still feel the earth shaking under their feet. The two strong earthquakes that occurred a week ago with a difference of 33 hours they continue to cause afraid, while it ends 1,400 houses have been declared uninhabitable.
According to the research director of the seismologist of the Geodynamic Institute Gerasimo Chouliara, the The post-seismic sequence runs smoothly. while more than 600 aftershocks of up to 3 Richter have been recorded, while thousands of smaller earthquakes have been recorded. «The case of the 2 very strong earthquakes that occurred last week has been observed on other occasions in Greece and in other tectonic areas where seismology has recognized the dynamic characteristics in the analysis of similar complex seismic events.
The seismic activity analysis shows a gradual decrease in the number of aftershocks over time and we believe that the seismic sequence is evolving normally. “said mr Χουλιάρας.
Are in progress intensive building inspections in affected areas of the double earthquakes in Elassona and Tyrnavos, by engineers from the Ministry of Infrastructure and Transport. According to official information, as of yesterday inspections and autopsies have been carried out in 3,486 buildings. Of these, 3,106 correspond to dwellings, of which 1,424 have been considered temporarily uninhabitable (in the primary control and will be re-inspected in the secondary).
As well, 92 professional premises have been inspected, of which they were temporarily unsuitable. (on primary control and will be retested on secondary) it’s 36. Regarding the temples and public buildings, the “yellows” (in the primary control and will be controlled again in the secondary) have been characterized as 55 out of 103 autopsies, while in another 185 buildings (warehouses, stables) 164 were considered temporarily unsuitable. for use (in the primary control and will be retested in the secondary).
A week after the strong earthquake they come to light very important data for the crack that gave the 6 Richter resulting in major damage to mostly old houses.
The Research Director of the Geodynamic Institute is Professor of Geology Athanasios Ghanas Talking to protothema.gr He said that the strong earthquake came from an unknown fault and not from the well-known Tyrnavos fault, while during his visit to the affected areas he noticed another geological phenomenon that has to do with the appearance of liquefaction. Specifically, Mr. Ghana he said: “The two earthquakes we had last week changed the image we had of the tectonic regime in Thessaly.
This is a radical revision that we have had to do because the fault that gave rise to the 6.3 magnitude earthquake is not the Tyrnavos fault. And this is because with the satellite data that we had on Wednesday afternoon and we got the results, they showed that the Tyrnavos fault is in the deformation created by the earthquake, that is, that the seismic fault is south of it. At a distance of 7-8 km and the epicenter of the earthquake is Damasi and there is the small plateau north of the Tyrnavos fault.
Thus, we have a new large fault in Thessaly that has a northwest-southeast direction. This seismic vibration created a subsidence of about 40 cm in the mountainous area north of Zarkos, Trikala. Also from the data analysis we have that the seismic sequence extends from the town of Vernikousa in Larissa prefecture to the town of Koutsochero and there is no dispersion of epicenters so we are talking about an area that has a length of about 30 – 35 kilometers where earthquakes occur. The post-seismic sequence runs smoothly.
The second earthquake, which occurred Thursday night, occurred near the town of Amouri, and we are investigating whether this earthquake occurred on Wednesday’s fault or if it occurred on another fault that is a little further north. Finally, I would like to point out that this earthquake caused a series of geological phenomena on the surface that are not related to the tectonic eruption.
We observe an extensive occurrence of liquefaction at distances of 20 and 30 km from the epicenter. Liquidation effects near the Pinios riverbed and near the Titarisi riverbed.
Let me tell you that liquefaction is the phenomenon that causes soils to behave like fluids and move in the event of an earthquake, causing damage to structures. It is observed in loose and incoherent soils (mainly sandy), which are saturated (it has water from the surface aquifer), when there is a seismic vibration of more than 6 degrees in the area ”.
One day after the visit of the Minister of Infrastructure and Transport Karamanlis Coast and the Secretary General of Infrastructure George Karagiannis in the affected areas of the municipalities of Elassona and Tyrnavos, the first 12 huts arrived. Since yesterday morning their distribution and installation has begun in specially designed areas with adequate infrastructure (bases, sewers, water flow, etc.) so that they can be safely placed and the booths are operational. At the end of the week, another 28 homes will be progressively relocated in the area, in order to meet the housing needs of the victims as soon as possible. In the areas have already been transferred and 40 caravans of the Ministry of Infrastructure and Transport and in the next few days another 25 will be moved.
Source: protothema.gr
