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2012 Northern Italy earthquakes
In May 2012, two major earthquakes occurred in Northern Italy, causing 27 deaths and widespread damage.
The first earthquake, registering magnitude 5.9, struck in the Emilia-Romagna region, about 36 kilometres (22 mi) north of the city of Bologna, on at 04:03 local time (02:03 UTC). The epicentre was between Finale Emilia, Bondeno and Sermide. Two aftershocks of magnitude 5.2 occurred, one approximately an hour after the main event and another approximately eleven hours after the main event. Seven people were killed.
A magnitude 5.8 earthquake struck the same area nine days later, on 29 May,〔(【引用サイトリンク】title=Magnitude 5.8 - NORTHERN ITALY )〕 causing an additional twenty deaths and widespread damage, particularly to buildings already weakened by the 20 May earthquake. The epicentre was in Medolla at a depth of about 10 kilometres (6 mi).
==Tectonic setting==
The Po Plain, a foreland basin formed by the downflexing of the crust by the loading of the Apennine thrust sheets, overlies and mainly conceals the active front of the Northern Apennines fold and thrust belt, across which there is about one millimeter (0.04 in) per year of active shortening at present. Information from hydrocarbon exploration demonstrates that the area is underlain by a series of active thrust faults and related folds, some of which have been detected from anomalous drainage patterns. These blind thrust faults are roughly WNW-ESE trending, parallel to the mountain front, and dip shallowly towards the south-southwest. Several damaging historical earthquakes, such as the 1570 Ferrara earthquake, have occurred in the area.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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