Dave and Gerry's Alonissos Island Information Site

Earthquakes Around Alonissos

It is one of the sad events to befall the island of Alonissos when at 3.57pm local time on March 9th 1965 an earthquake of Magnitude 6.3 hit the island and damaged a large number of the old stone buildings in the island capital of Palea Hora.  Two people were reported killed.  Damage was also sustained on the neighbouring island of Skopelos and the United States Geological Survey web site reported that the quake was felt as far away as Turkey.  On July 27th 2001 an earthquake hit the island of Skyros at 3.20am and caused damaged to buildings but no fatalaties.  The magnitude of the quake ranges from 5.7-6.5 on the Richter Scale.  The Richter Scale runs from 1 to 9+ and anything under 2 is generally not felt.

The Sporades Islands are located in the area of the North Aegean Trough which runs from the Therma´kos sedimentary basin in the area of Thessaloniki to the sedimentary basin in the northern city of Kavala.  The main reason for the large amount of seismic activity is that this trough is tectonically controlled by the extension of the North Anatolian Fault from Western Turkey and into the Aegean Sea from the Sea of Marmara.

On July 16th at 9.53pm Alonissos suffered a Magnitude 5.1 earthquake with an epicentre in the Aegean Sea around 20km north of the island.  We felt the tremor and for a few seconds the house rattled and all the metal hinges squeeked.  The earthquake then stopped as quickly as it started.  The earthquake was also felt on the mainland in Volos and people with friends on the island phoned to check if everything was OK.  Information on the Magnitude 5.1 earthquake can be found from the European Mediterranean Seismology Centre web site as well as a Magnitude 4.4 aftershock which was recorded by the European Mediterranean Seismology Centre the next morning around 5.30am.

The University of Athens, Geophysics Dept web site provides information about the locations of the latest earthquakes and the activity levels of the North Aegaen Trough can be seen from the data on the University of Thessaloniki, Geophysics Dept web site.  Click on catalog (sic) against North Greece in the "Select Area of Interest" and scan down to the bottom of the page for the latest information on seismic activity.

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