Another moderately dangerous earthquake near Patras, Greece

Earthquake overview : A nightly aftershock earthquake has scared the Patras (Patrai) area again. The shock was almost as strong than the earthquake on August 7 and again very shallow. The area has a lot of magnitude 4 to 5 aftershocks since the shock on August 7.

We kindly ask  people who have felt this earthquake to share their information with our many readers (also from your area). Please use the “I Have Felt it” form below.

Landscape near Agios Georgios, epicenter area of the aftershock - Panoramio image courtesy sinis14 - http://www.panoramio.com/photo/3849192

Update 07:10 UTC : Greek seismologists have declared that the present earthquake cannot be seen as an aftershock of the August 7 earthquake, but as a separate incident.

Update 07:02 UTC : In Achaia and Ilia terrified residents were thrown from their beds and took to the streets.

Update 06:02 UTC : These are the data as recorded by the most important seismological agencies in the world :
Greece Institute of Geodynamics : 4.9 @ 4 km depth !
USGS : 4.9 @ 8.5 km depth
GFZ : 4.7 @ 5 km depth
EMSC : 4.8 @ 15 km depth

Update 06:01 UTC : The average Felt intensity as reported by EMSC is IV MMI (light shaking)

Update 06:00 UTC : The Patras area has been hit by tens of aftershocks since many weeks

Update 05:16 UTC : As far as the present time, there are no reports of damage or injuries

Update 05:14 UTC : The epicenter of this earthquake was below a number of small villages located in the vicinity of Road 33 like Kalentzi, Agios Georgios, Stasineika, Manesi and Andrikopouleika

Update 05:13 UTC : Greek seismologists are expecting numerous aftershocks around magnitudes 3 to 4

Felt Reports as received by EMSC

Dymi : ΠΟΛΥ ΔΥΝΑΤΟΣ ΜΕ ΑΡΚΕΤΗ ΔΙΑΡΚΕΙΑ ΚΑΙ ΔΥΝΑΤΟ ΗΧΟ.
Movri : it woke us up. There was a noise before the earthquake and then the bed started shaking! It lasted some seconds - more than 30 seconds. We went outside of the house and our neighbours did the same!
Patrai : From the type of oscillation, I believed that the focus would be far enough away from Patras, where I live. The oscillation was somewhat long period. Most of people felt the shake but not panicked because the nature of the oscillations that I mentioned before.
Patrai : Me and my wife woke up but not the children
Patrai :It was almost three minutes long, one of the longest earthquakes I've experienced. It was swaying and trembling combined.
Patrai :The earthquake woke us up. Lasted quite some time and shoke in a different way that recent earthquajes in the Patras gulf so I immediately understood it originated from a longer distance.
Nafpaktos :  I JUST GO TO SLEEP THIS QUAKE FELT LIKE IT CAME FROM FAR AWAY BUT IT FELT BIG!IT STARTED SOFT GOT BIGGIER STARTED GETING SOFT AGAIN BUT THEN IT PICKED UP!IT WAS LONG LASTING!AS I SEE I AM FAR FROM THE CENTER OF THE QUAKE HOPE NO ONE IS HURT BY THIS QUAKE!

Felt Reports as received by Earthquake-Report.com
Patrai (Patrasso) : niente di preoccupante IV MMI (light shaking)
Kalavrita : We were about 65km from epicenter in the mountain town of Kalavrita. Woke us up with substained shaking. IV MMI (light shaking)

Most important Earthquake Data:
Magnitude : 4.9
UTC Time : Saturday, August 20, 2011 at 02:00:23 UTC
Local time at epicenter : Saturday, August 20, 2011 at 05:00:23 AM at epicenter
Depth (Hypocenter) : 8.5
Geo-location(s) :
30 km (18 miles) S of Patrai, Greece
76 km (47 miles) ENE of Zakynthos, Greece
108 km (67 miles) NNW of Kalamata, Greece

Links to important maps
Satellite map of the greater epicenter area
USGS I Have Felt It map

USGS historic earthquakes map
USGS Seismic hazard map
Scientific data overview

Earthquake Overview : At 17:35 local Greece time, an shallow moderate earthquake struck the greater Patras area.  The epicenter is very close to Lepanto and  Nafpaktos.

UPDATE 08/08 - 07:49 UTC : As you can read below in the many I Have Felt it Reports,  the locations of Nafpaktos and Rio were the hardest hit during this earthquake. People have been scared and are now even more scared that a stronger earthquake may occur, because they had no aftershocks so far.  We encourage our readers to read the many Felt Reports below as they give a very good impression of the strength of the shaking.

UPDATE 20:37 UTC : The Greek Seismological agency expects aftershocks in the 3 to 4 magnitude range

UPDATE 20:23 UTC : In Nafpaktos, a 3 storey apartment building was evacuated because of possible structural damage caused by the earthquake. The 40 residents were refused to enter their flats. Engineers from the municipality will inspect the building and will decide whether the flat owners may return to their homes.

Nafpaktou (Nafpaktos) earthquake area - Greece - panoramio picture courtesy billako - http://www.panoramio.com/photo/6192269

UPDATE 17:49 UTC : Except of the collapsed wall in Patras, there are NO other reports of damage or injuries so far.

 

UPDATE 17:47 UTC : Maximum intensity we have found so far was in the Rio, Nafpaktos area was VI MMI (strong shaking)

UPDATE 17:43 UTC : Our earliest title and danger estimate was based on a magnitude of 5.1 at a depth of 5 km.  The Greece seismological network who has seismographs closest to the epicenter is reporting a magnitude of 4.7 at a depth of 18 km, a lot less dangerous than 5.1 @ 5 km.
USGS has recalculated a second time and comes now on a Magnitude of 5.0 at a depth of 13.1 km.

UPDATE 17:37 UTC : People ran out in the streets in the greater Patras area as the earthquake seemingly frightened people

UPDATE 17:35 UTC :A wall collapsed on the road in Patrai (Patras)

UPDATE 17:35 UTC : The epicenter is located just 2 km southwest of Lepanto

UPDATE 17:16 UTC : Nafpaktos or Naupaktos has a population of 13,793 people. Nafpaktis is definitely the location with the highest risk.

Felt reports received by Earthquake-Report.com
Rion Achaia : At beach overlooking Rion Bridge, lying on back, shook sideways for about 5 seconds, with loud vibration from beneath the earth (strong shaking MMI VI indicated)
Rio : J'étais sur la plage de Rio : tout le monde s'est mis à crier. Les secousses étaient assez violentes (Moderate shaking MMI V indicated)

Felt reports as received by the colleagues of EMSC :
Report via intermediate from Nafpaktos area : The usual car and shops sequrity alars fire up!!!!!  my relatives was on a village north from nafpaktos at mountains  'ano xora nafpaktias' and they said they shaked a lot so  i suppose there was the center of the seism.
Patrai (Patras) - 17 km from epicenter : It was the strongest and lasted the longest of the several earthquakes we have had this past week.
Patrai : δυνατή ταλάντωση με μεγάλη διάρκεια, περίπου 50 δευτερόλεπτα
Dymi : The ground was shaking heavily.
Rio (Greece) (12 km S from epicenter) - It did not last long but it was quite strong
Rio (Greece) (12 km S from epicenter) - Very violent.  We had many over the last week, but this one was the largest and scariest.
Patrai (Greece) (18 km SW from epicenter) - Stin arxi inane grigoro alla kata tin diarkeia ekane Kati San pauses Kai ekane poli me gales talantwseis.Kai meta Pali grigora
Nafpaktos  : THIS QUAKE WAS THE WORST ONE WE HAD THESE PAST DAYS! MANY THINGS IN MY HOME FELL AND BROKE! I WAS AT THE BEACH DURING THE QUAKE BUT IF WAS HUGE! A LOT OF MOVEMENT VERY LONG QUAKE! AND A LOT OF NOSIE!  EVERYONE IN THE AREA IS VERY SCARED THAT THERE WOULD BE ANOTHER! AND AS I SEE THERE WILL BE! ANOTHER THING, WE HAVEN'T HAD ANY AFTERSHOCKS IS THIS NORMAL? SOMETHINGS NOT GOOD...JUST HOPE THE NEXT ONE ISN'T A LOT BIGER!
Rio : It was quite strong. At one point it felt like the house was "hopping" up & down. No aftershocks have occured since.
Rio : A small library in the basement was turned over and several vases fall at the floor. On the ground floor only several picture frames were turned over.
Áyios Vasílios : I felt for first time so strong earthquake in my home. I thought that it had the same magnitude as the earthquake at aegio achaia few years before. The aegio is about 30KM NE faraway from  my location at Agios Vasileios.

UPDATE : YouTube News bulletin from NewsIt.gr

UPDATE : some other data we could find for those among you who understand this :
Date: 07/08/2011, 14:35:35 (GMT)
Magnitude: 4.6 ML
Latitude: 38.40 N
Longitude: 21.83 E
Depth: 5 Km From NOA_HL (Hellenic Seismological Broadband Network)

UPDATE : The earthquake has been felt several km from the epicenter

UPDATE : some Greece sources are reporting slight damage in Patras.

UPDATE : Following the Greece seismological institute, the epicenter is located just west of Nafpaktos. Click here to see the map with the epicenter

UPDATE : less dangerous data from the Hellenic Unified Seismological Network : Magnitude 4.7 @ a depth of 18 km.

UPDATE : EMSC reports a 5.0 magnitude at a depth of 5 km

UPDATE : USGS has changed the depth to 11.8 km

At 17:35 local Greece time, an shallow moderate earthquake struck the greater Patras area. The epicenter is following the USGS just on coast (we have to take into account that a location error can put the epicenter more below land or in the sea).
The epicenter is almost below Efpalio and very close to Nafpaktos.
Earthquake-Report.com calls this earthquake moderately dangerous if the epicenter below land will be confirmed and if the shallow depth is maintained.

Quake Flash reports are used by Earthquake-Report.com to report on earthquakes which we categorize as 'probably not dangerous', but scared a lot of people living above it. The magnitudes may be in between M 3.0 or M 5.0, depending how used people are to earthquakes in that part of the world.

Most important Earthquake Data:
Magnitude : 5.1
UTC Time : 14:35:34
Local time at epicenter : 17:35:34
Depth (Hypocenter) : 5.6
Geo-location(s) :
24 km (14 miles) NE of Patrai, Greece
113 km (70 miles) NE of Zakynthos, Greece
164 km (101 miles) WNW of ATHENS, Greece

Links to important maps
Satellite map of the greater epicenter area
USGS I Have Felt It map

USGS historic earthquakes map
USGS Seismic hazard map

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I have felt it Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo siento – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه

Comments

  1. Gary Davidson says:

    We are in Mirovryssi, 12 km inland from Aigio (about 40km from Patras). This is the first quake we have experienced and we were all a bit shocked and frightened - especially the kids. The house shook pretty violently for about 5-10 seconds and some things fell, but no real damage.