Overblog
Suivre ce blog
Editer l'article Administration Créer mon blog

Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #Sismologie
The earthquake of Amatrice and its aftershocks compared to the epicenters of earthquakes in 1997 and 2009 in the Apennines. CSEM map

The earthquake of Amatrice and its aftershocks compared to the epicenters of earthquakes in 1997 and 2009 in the Apennines. CSEM map

  Images of devastation in Amatrice - photo RSOE

Images of devastation in Amatrice - photo RSOE

A strong earthquake of magnitude 6.2 and shallow depth 4.2 km, hit at 3:36 local on August 24 the central Italy.

The combination of the magnitude, the shallow depth of the hypocenter and dilapidated buildings, not adapted to seismic standards, let at present 247 dead and 400 wounded, strong balance sheet likely to increase, in the province of Rieti where the cities of Amatrice and Accumoli were destroyed almost entirely; more than 6,500 people are homeless in the province.

According to seismologists, the earthquake of 2016 fills the gap left by the earthquakes of Assisi in 1997 and the one that struck L'Aquila in 2009. All three are located on normal faults responsible for the creation of the Apennine Mountains.

Earthquakes in the province of Rieti / Italy
 The epicenter of the earthquake and its aftershocks 06.24.2016 /  to 15h - doc INGV terremoti

The epicenter of the earthquake and its aftershocks 06.24.2016 / to 15h - doc INGV terremoti

Magnitude and timing of earthquakes 08/24/2016 - Doc. CSEM

Magnitude and timing of earthquakes 08/24/2016 - Doc. CSEM

The earthquake of 24 August 2016, and his aftershocks, are the expression of the tectonic extension to the west dominating today in the region, in response to an fasted opening of the Thyrhenian basin that the compression between the Eurasian and African plates.

At the location of the earthquake, the Eurasian plate is moving north relative to Africa at a rate of 24 mm per year. (USGS)

 

Earthquakes of 24.08.2016 - Alert Sky photo via Twitter

Earthquakes of 24.08.2016 - Alert Sky photo via Twitter

 Simplified tectonoc of the western Mediterranean, with the opening of the Tyrrhenian Sea and location of earthquakes in 2016 - Doc Chris Rowan / Allochtonous

Simplified tectonoc of the western Mediterranean, with the opening of the Tyrrhenian Sea and location of earthquakes in 2016 - Doc Chris Rowan / Allochtonous

GPS data from the INGV terremoti showing the movement in Italy, and therefore earthquakes affecting the crust.

GPS data from the INGV terremoti showing the movement in Italy, and therefore earthquakes affecting the crust.

The region of Amatrice and Accumoli has experienced many earthquakes over the last 700 years.

The most serious incident took place on October 7, 1639, when a similar magnitude earthquake struck the villages. In the chronicle of the time, the earthquake was attributed to a divine punishment because of the "lascivious behavior and enormous sins" of the inhabitants. (La Republica) ...  since that, the science corrected the reason.

 

The city of Amatrice destroyed by the earthquake of 24/08/2016 - photo USA Today

The city of Amatrice destroyed by the earthquake of 24/08/2016 - photo USA Today

Amatrice earthquakes over the last 500 years - Doc DBMI / INGV

Amatrice earthquakes over the last 500 years - Doc DBMI / INGV

Sources :

- CSEM – EMSC – link

- USGS Earthquake Hazards Program – link

- La Républica.it : La tragedia di Amatrice e Accumoli e quel "terremoto gemello" del 1639 – link

- Earthquake report - Devastating earthquake in Rieti, Italy - at least 247 dead; 400+ likely - link

Commenter cet article

Articles récents

Hébergé par Overblog