Strong and shallow M 6.1 earthquake struck island of Cephalonia, Greece

Strong and shallow M 6.1 earthquake struck island of Cephalonia, Greece

Strong and shallow earthquake magnitude 6.1 struck Lixourion, Greece on January 26, 2014 at 13:55 UTC. EMSC is reporting M 6.0 at depth of 24 km, USGS increased magnitude to M 6.1 and reports depth of 12.3 km. 18 strong aftershocks were reported by 22:00 UTC (USGS data).

Epicenter was located 4 km NW of Lixoúrion (population 3 758), 10 km NW of Argostólion (population 9 820) and 293 km W of Athens (population 729 137). I felt it reports were received from Albania, Montenegro, Bulgaria and Southern Italy  

Overall, the population in this region resides in structures that are a mix ou landslides that might have contributed to losses. 

Selected cities exposed from GeoNames Database of Cities with 1,000 or more residents.(k = x1,000)

MMI City Population
VII Lixourion 4k
VII Argostolion 10k
VI Valsamata 1k
VI Gaitanion 2k
V Sami 1k
V Poros 1k
IV Patra 163k
IV Ioannina 64k
III Lamia 47k
III Larisa 129k
III Vlore 90k
 

Updates:

First reports are mentioning cracked roads and a chaotic situation on Cephalonia. Most people were frightened by the earthquake and ran to the streets. Fire brigade and police are checking for possible damaged buildings and injuries.

16:01 UTC - Damaged buildings are reported from Lixouri, located only 6 km from the epicenter. Power supply is interrupted in Fiskardo, located in northern Cephalonia. More damage reports coming in from different parts of the Island, so far “only” bricks falling from walls, cracks and other limited damage, but it seems that several buildings are affected. In Lixouri a hospice and some homes were demolished.

Newspapers report that Lixouri is the most affected area. Many houses there suffered damage in diverse extent. The quake also caused rockfalls and minor landslides in parts of the island!

One house in Kounopetra collapsed, luckily without affecting people.

Relatively large ash emission of the volcano Etna on Sicily (Italy) followed shortly after this quake was felt there. A connection of both events is possible. (ER)

22:00 UTC - Strong aftershocks are being reported in the region. A total of 19 earthquakes were recorded so far.

Image source: USGS

M 4.4 - 8km WNW of Lixourion, Greece - 2014-01- 26 @ 19:53:17 UTC - Depth: 10.1 km

M 4.6 - 11km WNW of Lixourion, Greece - 2014-01-26  @ 19:12:05 UTC - Depth: 10.8 km

M 4.4 - 9km SSW of Lixourion, Greece - 2014-01-26 @ 19:03:06 UTC - Depth: 10.1 km

M 5.4 - 15km WNW of Lixourion, Greece - 2014-01-26 @ 18:45:09 UTC - Depth: 10.3 km

M 4.2 - 10km WSW of Lixourion, Greece - 2014-01-26 @ 17:45:16 UTC - Depth: 10.0 km

M 4.5 - 15km W of Lixourion, Greece - 2014-01-26 @ 16:55:51 UTC - Depth: 10.9 km

M 4.3 - 18km NNW of Lixourion, Greece - 2014-01-26 @ 16:43:35 UTC - Depth: 8.1 km

M 4.4 - 14km WSW of Lixourion, Greece - 2014-01-26 @ 16:08:56 UTC - Depth: 10.7 km

M 4.4 - 16km W of Lixourion, Greece - 2014-01-26 @ 15:36:38 UTC - Depth: 10.5 km

M 4.6 - 13km SW of Lixourion, Greece - 2014-01-26 @ 15:29:28 UTC - Depth: 11.2 km

M 4.5 - 26km NNW of Lixourion, Greece - 2014-01-26 @ 14:59:25 UTC - Depth: 11.2 km

M 4.3 - 13km NW of Lixourion, Greece - 2014-01-26 @ 14:47:36 UTC - Depth: 21.8 km

M 4.4 - 7km NW of Lixourion, Greece - 2014-01-26 @ 14:41:39 UTC - Depth: 11.1 km

M 4.6 - 15km W of Lixourion, Greece - 2014-01-26 @ 14:32:52 UTC - Depth: 12.0 km

M 4.4 - 28km NW of Lixourion, Greece - 2014-01-26 @ 14:29:20 UTC - Depth: 11.9 km

M 4.6 - 10km WNW of Lixourion, Greece - 2014-01-26 @ 14:24:05 UTC - Depth: 10.1 km

M 4.4 - 11km SW of Lixourion, Greece - 2014-01-26 @ 14:21:58 UTC - Depth: 10.6 km

M 4.9 - 7km NW of Lixourion, Greece - 2014-01-26 @ 14:08:40 UTC - Depth: 11.9 km

M 6.1 - 3km S of Lixourion, Greece - 2014-01-26 @ 13:55:42 UTC - Depth: 12.3 km

Source: USGS

At least 2 people are confirmed to be slightly injured. They went to the hospital in Argostoli. Due to the damage caused to this hospital, mainly to its roof, it was decided to evacuate it. Patients were transferred to the next wooden building.

February 4, 2014 - 12:00 UTC:

Dangerous earthquake swarm prompts declaration of natural disaster zone on Ionian island of Cephalonia, Greece

Authorities declared Ionian island on Cephalonia a natural disaster zone on February 3, 2014. Eight days after the first M 6.1 earthquake that hit the region of Argostólion on January 26, 2014 at 13:55 UTC (15:55 local time), a second M 6.0 earthquake hit this region on February 3, at 03:08 UTC (05:08 local time).

According to EMSC, since the first shock, numerous aftershocks have been recorded. In 9 days (January 26 - February 4 at 07:42 UTC), 349 M3+ earthquakes, 43 M4+ earthquakes, and 3 M5+ earthquakes have been recorded.

*** end of updates ***

Seismotectonics of the Mediterranean region and vicinity

The Mediterranean region is seismically active due to the northward convergence (4-10 mm/yr) of the African plate with respect to the Eurasian plate along a complex plate boundary. This convergence began approximately 50 Ma and was associated with the closure of the Tethys Sea. The modern day remnant of the Tethys Sea is the Mediterranean Sea. The highest rates of seismicity in the Mediterranean region are found along the Hellenic subduction zone of southern Greece, along the North Anatolian Fault Zone of western Turkey and the Calabrian subduction zone of southern Italy. Local high rates of convergence at the Hellenic subduction zone (35mm/yr) are associated with back-arc spreading throughout Greece and western Turkey above the subducting Mediterranean oceanic crust. Crustal normal faulting throughout this region is a manifestation of extensional tectonics associated with the back-arc spreading. The region of the Marmara Sea is a transition zone between this extensional regime, to the west, and the strike-slip regime of the North Anatolian Fault Zone, to the east. The North Anatolian Fault accommodates much of the right-lateral horizontal motion (23-24 mm/yr) between the Anatolian micro-plate and Eurasian plate as the Anatolian micro-plate is being pushed westward to further accommodate closure of the Mediterranean basin caused by the collision of the African and Arabian plates in southeastern Turkey. Subduction of the Mediterranean Sea floor beneath the Tyrrhenian Sea at the Calabrian subduction zone causes a significant zone of seismicity around Sicily and southern Italy. Active volcanoes are located above intermediate depth earthquakes in the Cyclades of the Aegean Sea and in southern Italy.

In the Mediterranean region there is a written record, several centuries long, documenting pre-instrumental seismicity (pre-20th century). Earthquakes have historically caused widespread damage across central and southern Greece, Cyprus, Sicily, Crete, the Nile Delta, Northern Libya, the Atlas Mountains of North Africa and the Iberian Peninsula. The 1903 M8.2 Kythera earthquake and the 1926 M7.8 Rhodes earthquakes are the largest instrumentally recorded Mediterranean earthquakes, both of which are associated with subduction zone tectonics. Between 1939 and 1999 a series of devastating M7+ strike-slip earthquakes propagated westward along the North Anatolian Fault Zone, beginning with the 1939 M7.8 Erzincan earthquake on the eastern end of the North Anatolian Fault system. The 1999 M7.6 Izmit earthquake, located on the westward end of the fault, struck one of Turkey's most densely populated and industrialized urban areas killing, more than 17,000 people. Although seismicity rates are comparatively low along the northern margin of the African continent, large destructive earthquakes have been recorded and reported from Morocco in the western Mediterranean, to the Dead Sea in the eastern Mediterranean. The 1980 M7.3 El Asnam earthquake was one of Africa's largest and most destructive earthquakes within the 20th century.

Large earthquakes throughout the Mediterranean region have also been known to produce significant and damaging tsunamis. One of the more prominent historical earthquakes within the region is the Lisbon earthquake of November 1, 1755, whose magnitude has been estimated from non-instrumental data to be about 8.0. The 1755 Lisbon earthquake is thought to have occurred within or near the Azores-Gibraltar transform fault, which defines the boundary between the African and Eurasian plates off the west coast of Morocco and Portugal. The earthquake is notable for both a large death toll of approximately 60,000 people and for generating a tsunami that swept up the Portuguese coast inundating coastal villages and Lisbon. An earthquake of approximately M8.0 near Sicily in 1693 generated a large tsunami wave that destroyed numerous towns along Sicily's east coast. The M7.2 December 28, 1908 Messina earthquake is the deadliest documented European earthquake. The combination of severe ground shaking and a local tsunami caused an estimated 60,000 to 120,000 fatalities. (USGS)

Featured image: USGS

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