.:SafeGreece:. - June 12th, 2017: 6.3 Earthquake in N. Aegean Sea - Summary
6.1 Earhquake in N. Aegean Sea

Earhquake and following phenomena

On June 12, 2006, 15:28, a 6.3 magnitude earthquake of 11 km focal depth was recorded by the Geodynamic Institute of Athens in the sea area between Chios and Lesbos islands. The earthquake caused by a 25-kilometer-long northwest-southeast underwater fault, very close to the southern coastline of Lesvos. The vibration became particularly noticeable in Lesvos and Chios, but also in Smyrna and Bursa.

Water clouds, sea back and for-movement, whirlwinds, and typical boat movements in the harbour recorded by video and eyewitnesses make up the image of a small size and intensity tsunami, caused by the 6.1 magnitude earthquake, according to Dr. Efthimis Lekkas. The tsunami wave height is estimated at 30-40 cm.

The main earthquake followed many others of magnitude below 5 until Thursday night. All aftershocks came from the same fault.

At 20:50 on Saturday night was a strong 5.3 magnitude earthquake occured, 10 kilometers depth, the largest in magnitude aftershock after the main one of June 12, caused by the same fault. Such an earthquake was anticipated by the specialists as a further depletion of the accumulated tectonic forces.

Preliminary Report on the event was published by the Institute of Engineering Seismology & Earthquake Engineering of Greece (ISTAK).

The aftermath

The most significant damage from the earthquake suffered the village of Vrissa Polichnitos, with the majority of buildings having collapsed or suffered serious disasters and the loss of life of 43-year-old Eleni Valelis, which was plagued by the debris of her own collapsed house. Among the collapsed buildings is the Primary School of Vrissa. Power and water supply was interrupted in the village.

The Natural History Museum of the National and Kapodestrian University of Athens, located in the village of Vrissa, Lesbos, suffered structural damage to the building and facilities, with detachments of exterior walls, elements drops and roof shifting, while the showcases and some of the rare exhibits of the Museum have been destroyed.

Old industrial buildings collapsed in Scala Polichnitos. Also collapsed part of the chimney of the old industrial olive mill building in Skala Loutra, which operates as a hotel. As a result of the industrial chimney collapse, much of the main building was destroyed.

Also cracks and drops of plaster have been in many buildings in the historical center of the city of Mytilene. Among them, the historic Town Hall at the coast of the city.

Minor damages recorded in Plomari, Lesvos, Chios and Kambos. Slopes closed the main road of Mytilene - Plomari at the height of Agios Isidoros and the road to Melinda on Lesvos.

637 buildings are unattainable, based on a recent update by the Ministry of Infrastructure and Transport on1.128 audits completed by June 16th. Από το σύνολο των αυτοψιών, 975 975 are dwellings, of which446 were considered residential and 529 non-residential. The rest off the autopsies are related to business premises, sanctuaries, warehouses and other buildings.

the National and Kapodestrian University of Athens mission in Lesvos printed and published the affected constructions in the area of Vrissa. The interactive map here.

The managenet

The mobilization of the state apparatus was immediate. In the very first hours after the earthquake a helicopter landed in Mytilene (Lesvos) carrying a governmental delegation, composed of the Deputy Minister of Citizen Protection, Nikos Toskas, members of the Ministry of Transport, Infrastructure and Networks, the Secretary General for Civil Protection, Yannis Kapakis, Anti-seismic design and protection Organisation (OASP) President, Efthimios Lekkas, among other stakeholders. A team of Diasaster Management Special Unit (EMAK) participates in the group. The Municipality of Lesvos was declared in state of Emergency.

The Doctors of the World, with the mobile medical unit and a group of doctors, nurses and psychologists, rushed to the area of ​​Polyhnios to provide first aid and support to the residents of the village of Vrissa and the people who had been transferred there.

A team of 40 engineers arrived the following day escorted by the Infrastructure, Transport and Networks Minister, Christos Spirtzis, in order to start building auditing as soon as possible.

A series of meetings of Coordination Civil Protection Organizations took place at the level of the Municipality and the Region, and a question to the European Commission regarding the intention and ways in which the Commission intends to stand jointly with the inhabitants of Lesvos was raised by Greek MEPs.

Possible relocation of the people of Vrissa will only occur if there are insurmountable obstacles in the subsoil.

The process of seismic expansion is expected to last at least two months.

The question

The area has a rich history of seismic activity and disasters. However, impressive is the astonishing resemblance of the recent earthquake to that of 28 November 1845, wich caused damages to the same regions, as noted by Dr. Gerassimos Papadopoulos.

Question remains the centralization of the earthquake. Extensive disasters are concentrated in the village of Vrissa, while other very close areas and settlements have not suffered corresponding damage. The phenomenon may be attributed to a combination of negative factors, according to Efthimis Lekkas, who stated in ANA-MPA: "We are likely to have a loose ground, a high aquifer, seismic waves dispersed in the wider area and then a contribution of seismic waves, such phenomena as we are going to investigate, but if there are no real-world tests and applications, we will not be able to come up with safe conclusions."

 

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