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Earthquakes: Mag 6 N. Italy and Mag 5.6 W. Bulgaria

  1. May 21, 2012 #1

    Astronuc

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    Something to watch during the next few days and near term

    I was looking at information on this quake and subsequent aftershocks:
    http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0009tk0.php [Broken]

    Sunday, May 20, 2012 at 02:03:52 UTC
    Sunday, May 20, 2012 at 04:03:52 AM at epicenter

    36 km (22 miles) NNW of Bologna, Italy
    69 km (42 miles) E of Parma, Italy
    72 km (44 miles) SSE of Verona, Italy
    339 km (210 miles) NNW of ROME, Italy

    Code (Text):
             UTC DATE-TIME       LAT     LON   DEPTH
     MAG      y/m/d h:m:s        deg     deg     km
     4.5  2012/05/21 16:37:31  44.879  11.378    8.8
     4.7  2012/05/20 17:37:15  44.885  11.296   21.0
     5.1  2012/05/20 13:18:02  44.795  11.440    8.9
     4.5  2012/05/20 10:12:21  44.849  11.162   10.0
     4.7  2012/05/20 09:13:21  44.800  11.176   10.0
     5.1  2012/05/20 03:02:50  44.776  11.090   10.0
     6.0  2012/05/20 02:03:52  44.800  11.192    5.1
     4.2  2012/05/19 23:13:27  44.956  11.241    6.3
    I then went back to the main map to find a report on another earthquake about an hour and 15 minutes ago near Sofiya, Bulgaria. It was initially reported as mag 5.8, but has been since donwgraded to mag 5.6
    http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0009uyx.php [Broken]

    Tuesday, May 22, 2012 at 00:00:33 UTC
    Tuesday, May 22, 2012 at 03:00:33 AM at epicenter

    Lat/Long: 42.686°N, 23.009°E
    depth: 9.4 km (5.8 miles)

    24 km (14 miles) W of SOFIA, Bulgaria
    73 km (45 miles) N of Blagoevgrad, Bulgaria
    115 km (71 miles) SE of Nis, Serbia
    141 km (87 miles) NNE of Strumica, Macedonia

    I have a very dear friend in Sofiya who I hope is alright.

    I'm wondering if there is any connection between the two events.
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. May 21, 2012 #2

    davenn

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    Hi Astronuc

    I just plotted them on google earth
    they are a very long way apart, Yoou couldnt even say they were on the same faultline

    attachment.php?attachmentid=47529&stc=1&d=1337660855.jpg

    if they were substantially closer together, say separated by up to ~ 100km or so, you would have a good argument to say either the 6.0 induced the 5.6 or that the 6.0 changed the local stressfield enough to trigger the 5.6.

    Induced seismicity as a distance has been observed, notibly in California, as a result of the early 1990's Landers M7+ event, with induced activity much further north long long way outside both the local stressfield or the aftershock zone

    my conclusion would be the Italy and Bulgaria events are not likely to be directly related

    cheers
    Dave
     

    Attached Files:

  4. May 22, 2012 #3

    Astronuc

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    I wasn't thinking that one caused the other, i.e., that one was a precursor to the other, but tectonically, they are related - African plate pushing up into the Eurasian plate. The two earthquake swarms are in a related (interconnected) system of reverse faults. It's rather complicated in that particular region. There is also some coincidence with the Tethyan Metallogenic Belt, and specifically the Tethyan Eurasian Metallogenic Belt.

    See attached.

    and - http://www.geo.edu.ro/sgr/mod/downloads/PDF/Jankovic-MinDep-1997.pdf

    I wonder if that area (around and including the Adriatic) should be designated a separate plate/zone. The western border would be through Italy and the eastern border through the Carpathians and Balkans in Romania and Bulgaria.

    One report from the area around the Italian earthquake swarm mentioned some who indicated that local authorities had informed the locals that they were not in an area of concern. "For years they told us that this was an area of low seismic activity, so nobody was prepared for something like this." If that's true, then the authorities are negligent. Of course that area is in a zone of potentially strong seismic activity.
    Ref: http://www.bbc.co.uk/news/world-europe-18143547
    Historical seismicity - http://neic.usgs.gov/neis/bulletin/neic_b0009tk0_h.html
    Seismic hazard map - http://neic.usgs.gov/neis/bulletin/neic_b0009tk0_w.html

    My friend in Sofiya is OK.
     

    Attached Files:

    Last edited: May 22, 2012
  5. May 23, 2012 #4

    davenn

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    Ahhh no probs :)

    it was just with your last comment about any connections between the two events
    Yes the only connection is that they are on the same plate boundary

    That first link you gave looks very interesting with the information on mineral deposits. I am going to have to spend some time and have a good read.

    I am pleased to hear that your friend is ok :smile:

    Its a real problem in many of the countries around the Mediterranean that most of the buildings are of the style of construction that doesnt withstand even moderate shaking without crumbling

    cheers
    Dave
     
  6. May 29, 2012 #5

    Astronuc

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    A few more earthquakes in N. Italy and near Sofiya, Bg.

    Code (Text):
    Northern Italian Earthquakes
    MAG    UTC DATE-TIME        LON     LAT   DEPTH
             y/m/d h:m:s        deg     deg    km  
    4.7 2012/05/29 08:40:57   44.853  10.990  10.1  
    4.7 2012/05/29 08:25:51   44.814  10.948  10.0  
    5.8 2012/05/29 07:00:03   44.814  11.079   9.6  
    4.2 2012/05/25 13:14:04   44.860  11.142  10.0  
    4.5 2012/05/23 21:41:18   44.802  11.296   9.1  


    Earthquake near Sofiya,  BULGARIA
    4.5 2012/05/29 07:23:31   42.652  23.035   7.9
     
     
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