Weak but shallow and slightly damaging earthquake close to Banja Luka, Bosnia and Herzegovina

Landscape in the vicinity of the epicenter - Panoramio picture courtesy Fredo2110 - http://www.panoramio.com/photo/15983491

UPDATE : New reports indicate that a lot of houses was damaged in Opsječko (Čelinac).  Additionally everything tumbled from the shelves. A lot of electrical appliances were broken after falling to the ground.

UPDATE : Historic earthquake maps are showing a few very damaging earthquakes in this area.
On 26 and 27 October 1969, two devastating earthquakes (6.0 and 6.4 on the Richter scale) damaged many buildings in Banja Luka. 15 people were killed, and over a thousand injured (source : wikipedia)
More recently a similar earthquake type occurred in Kraljevo Serbia  (read our articles on the 2010 Kraljevo, Serbia earthquake).

UPDATE : Most of the people in Čelinac, apparently the location who was frightened most,  left their houses and stayed in the streets for some time fearing aftershocks.

UPDATE : Power was lost in many villages surrounding the epicenter.

UPDATE : Local people have reported that roofs and chimneys were damaged and that a municipal building had cracks in the wall.

UPDATE : People all over the world do not understand why a small and weak quake like in Banja Luka frightens  the local people (4.5 max. magnitude) and why people in Chile do not even mention a 5.0 anymore. The answer is 2-fold :
a) The very shallow depth makes the earthquake as if the explosions took place under the houses
b) This is a transform faulting earthquake area which mainly has horizontal displacement (strike-slip).

UPDATE : A few testimonies from nearby locations collected by EMSC :

"I was alone on the first floor, but I couldn't get asleep, so i got downstairs at about 1 o'clock and half an hour later my mother woke me up. She said that there was broken glass and almost everything fell from the shelves. We didn't go upstairs until the morning. First news about the epicenter and strength of the earthquake came from mobile internet." (4 km from epicenter)

"This earthquake was announced by a roaring sound, like if a truck drives by in the distance and was getting louder and then the shaking began. The earthquake on March 21 in Banja Luka, started with a loud explosion as if a plane breaks the sound barrier. The windows rattle and immediately shook everything." (6 km from epicenter)

"This is the second earthquake in 2-month period. Many will be worried tomorrow probably, when they find out that it was quite strong.

If was sitting, and then at my desk started shaking and rattling. It was kind of upsetting, but as i said it wasn't so scary 'couse we had sth similar just more than month ago." (11 km from epicenter)

"My first earthquake in Banja Luka, it was scary..." (11 km from epicenter)

"first trembled briefly and then started to swim strongly." (11 km from epicenter)

"It's scary... There is no thing that you can do in that moment. I felt helpless." (11 km from epicenter)

UPDATE : Local sources are reporting a V to VI MMI (moderate to strong shaking).

Original text
Weak but very shallow earthquake very close to Banja Luka, a city with 221,106 inhabitants.
Epicenter below the farmland.
We have decided to write an in depth article at this weak earthquake (normally we only write in depth articles for shallow earthquakes from at least M 5.0 or higher), because the impact of such a weak earthquake was beyond proportion.

Most important Earthquake Data:
Magnitude : 4.3 (USGS) 4.5 (EMSC) 4.3 (GFZ)
UTC Time : Thursday, April 28, 2011 at 23:30:45 UTC
Local time at epicenter :  Friday, April 29, 2011 at 01:30:45 AM at epicenter
Depth (Hypocenter) :  10.1 (USGS), 10 (EMSC) and 5 (GFZ)
Geo-location(s) :
5 km NW Celinac (pop 6,670)
11 km (6 miles) ENE of Banja Luka, Bosnia and Herzegovina (pop 221,106)

Links to important maps
Google satellite map of the area showing the kind of terrain the earthquake took place
3-dimensional view of the earthquake area (USGS epicenter location)
USGS historic earthquakes map
USGS Seismic hazard map

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