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Magnitude 6.3 quake strikes Italy

Posted by feww on April 6, 2009

Magnitude 6.3 mainshock strikes central Italy

Magnitude 6.3 mainshock preceded by a foreshock measuring 4Mw and followed by a 4.8Mw aftershock strike central Italy about 95 km NE of Rome. The epicenter of the quake was near the city of L’Aquila, the most populated cities in central Italy.

According to various news reports, at least 20 people have been killed and many more could be trapped in the rubble.  About 5,000 buildings have been damaged and many are left homeless.

L’Aquila Seismic History:

L’Aquila, a medieval town of about 73,000 inhabitants, is the capital city of the Abruzzo region and of the Province of L’Aquila. However, thousands students, workers and tourists travel to the city each day.

  • L’Aquila was struck by a a cluster of quakes in 1348-50 which destroyed most of the city.
  • In 1461, another large quake razed most of the city to the ground.
  • In 1703, L’Aquila was almost completely destroyed by yet another quake.
  • According to local sources, another large earthquake destroyed most of the city about 100 years ago.
  • In 1997, a strong earthquake killed 15 people and damaged thousands of buildings in central Italy.

[Data from various sources.]

Location Map – Source: USGS

This Earthquake

Magnitude: 6.3

  • Monday, April 06, 2009 at 01:32:42 UTC
  • Monday, April 06, 2009 at 03:32:42 AM at epicenter

Location:  42.423°N, 13.395°E
Depth 10 km (6.2 miles) set by location program

  • 70 km (40 miles) W of Pescara, Italy
  • 95 km (60 miles) NE of ROME, Italy
  • 115 km (70 miles) SE of Perugia, Italy
  • 135 km (85 miles) S of Ancona, Italy

Location Uncertainty: horizontal +/- 4.6 km (2.9 miles); depth fixed by location program


Event ID:  us2009fcaf

4 Responses to “Magnitude 6.3 quake strikes Italy”

  1. feww said

    Quake Summary (European-Mediterranean Seismological Center):
    Magnitude: Mw 6.3
    Region: CENTRAL ITALY – Abrutian Apennine
    Date time: 2009-04-06 at 01:32:41.4 UTC
    Location: 42.38 N ; 13.32 E
    Depth: 2 km
    * 59 km E Terni (pop 110,412 ; local time 03:32 2009-04-06)
    * 7 km NW L’aquila (pop 72,279 ; local time 03:32 2009-04-06)
    * 6 km S Pizzoli (pop 3,378 ; local time 03:32 2009-04-06)

  2. feww said

    Tectonic Summary (mirrored from USGS)

    The April 6th 2009 earthquake in Central Italy occurred as a result of normal faulting on a NW-SE oriented structure in the central Apennines, a mountain belt that runs from the Gulf of Taranto in the south to the southern edge of the Po basin in northern Italy. Geologically, the Apennines are largely an accretionary wedge formed as a consequence of subduction. This region is tectonically and geologically complex, involving both subduction of the Adria micro-plate beneath the Apennines from east to west, continental collision between the Eurasia and Africa plates building the Alpine mountain belt further to the north and the opening of the Tyrrhenian basin to the west. The evolution of this system has caused the expression of all different tectonic styles acting at the same time in a broad region surrounding Italy and the central Mediterranean. The April 6th, 2009 earthquake is related to normal faulting and the east-west extensional tectonics that dominate along the entire Apennine belt, primarily a response to the Tyrrhenian basin opening faster than the compression between the Eurasian and African plates.

    The central Apennine region has experienced several significant earthquakes in recorded history. In 1997, a significant Mw 6.0 earthquake 85 km north-northwest of the April 6th 2009 event killed 11, injured over 100 and destroyed approximately 80,000 homes in the Marche and Umbria regions. This 1997 event was part of a series of earthquakes known as the Umbria-Marche seismic sequence, which included eight events of magnitude greater than M5.0 in a two-month period between September and November of that year.

  3. feww said

    Images of the deadly quake near Rome

  4. […] Magnitude 6.3 quake strikes Italy Earthquake Forecast 2009 Volcanoes, Santorini Eruption and Crops Failure in China […]

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