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

by Astronuc
Tags: bulgaria, earthquakes, italy
 Admin P: 21,399 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/earthquak...usb0009tk0.php 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  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/earthquak...usb0009uyx.php 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.
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 PF Patron Sci Advisor P: 1,958 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 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 Thumbnails
 Admin P: 21,399 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/downlo...inDep-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 Thumbnails
PF Patron
P: 1,958

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

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.

 Admin P: 21,399 A few more earthquakes in N. Italy and near Sofiya, Bg. 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