Low-quality cement, inadequate supporting rods among issues in Italian region hit by earthquake: Aon
August 24, 2016 by Canadian Underwriter
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The region of Italy hit by an earthquake early Wednesday morning, which killed at least 65, has buildings with “inadequate supporting iron rods” and a “relatively low” penetration of earthquake insurance for residential property, Aon plc’s Impact Forecasting LLC subsidiary suggested Wednesday.
“It remains too early to provide a specific economic or insured loss estimate at this time,” Impact Forecasting stated in a cat alert.
An earthquake, measuring 6.2 on the Richter scale, hit at 1:36 a.m. Greenwich Mean Time Wednesday morning (8:36 p.m. Tuesday Eastern time and 3:36 a.m. local time), the United States Geological Service reported. The epicentre was 10 kilometres southeast of Norcia. The Associated Press reported shaking was felt in Rome, about 170 kilometres to the southwest.
A building destroyed in 2009 by an earthquake in L’Aquila, Italy, 45 kilometres from the area hit by another tremor Aug. 24, 2016
“An unofficial count of fatalities was 65, though more than 100 people were feared to be missing,” said Impact Forecasting, a Chicago-based unit of Aon Securities Inc., the reinsurance broker of London-based commercial brokerage Aon.
USGS “has preliminarily estimated” there is a 62% probability that economic damage will exceed US$1 billion, Impact Forecasting stated.
“It is expected that the insured loss portion of the overall economic cost will be much lower,” Impact Forecasting added. “Earthquake insurance penetration is relatively low for the residential sector in Italy and large historical events have shown a significant discrepancy in the economic-to-insured loss ratio.”
The tremor was the result of “shallow normal faulting” on a fault running northwest and southeast in the Central Apennines mountain range, USGS stated. That mountain range “runs from the Gulf of Taranto in the south to the southern edge of the Po basin in northern Italy,” USGS added. It was formed as a result of subduction and that includes subduction “of the Adria micro-plate beneath Eurasia and the Apennines from east to west, continental collision between the Eurasia and Nubia (Africa) plates building the Alpine mountain belt further to the north and the opening of the Tyrrhenian basin to the west,” USGS stated.
The part of Italy affected by Wednesday morning’s earthquake “consists of structures that are a mixture of having both extremely vulnerable and earthquake-resistant construction,” Impact Forecasting stated. “The predominant vulnerable building types in Central Italy are unreinforced brick with mud and mid-rise nonductile concrete frame with infill construction. The combination of illegal building construction and the use of low-quality cement and inadequate supporting iron rods has been a known issue in this part of the country.”
#ItalyEarthquake: search & rescue teams & sniffer dogs from @crocerossa are on the ground looking for survivors. pic.twitter.com/BJcjgiOHbN
— IFRC (@ifrc) August 24, 2016
The “unofficial count of fatalities was 65, though more than 100 people were feared to be missing,” Impact Forecasting added.
“In some instances, towns were either completely flattened or a high percentage of structures were severely damaged.”
There have been “several significant earthquakes” in Italy’s central Apennine region, USGS noted, including a 6.7 quake Jan. 13, 1915, which killed about 32,000.
In September, 1997, a 6.0 quake occurred about 50 kilometres from Wednesday’s quake, killing 11 and destroying about 80,000 homes. Twelve years later, another event 45 kilometres from Wednesday’s earthquake, “near the town of L’Aquila, killed at least 295, injured over 1,000 and left 55,000 or more homeless,” USGS reported.
“In the aftermath of the April 2009 magnitude-6.2 earthquake in L’Aquila, a study from the European Center for Training and Research in Earthquake Engineering indicated that as many as 80,000 public buildings in Italy remained unsafe despite the enforcement of building construction,” Impact Forecasting said Wednesday. “However, structures that have been built to modern codes have largely performed well during recent strong earthquake events.”
The 2009 disaster “prompted economic losses” of nearly US$3 billion (with insured losses listed at nearly US$560 million), adjusted for inflation to this year, Impact Forecasting reported.
Related: Italian rescuers pull victims out of rubble after 6.2 earthquake hits northeast of Rome
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If the cement is of poor quality as I have seen in Kazakhstan then all of the rebar in the world is not going to help it.
Unreinforced, unconfined masonry buildings has little chance to survive near earthquakes.
There is an esy and cheap way to convert those old buildings into seismic resistant ones, by covering or attaching a welded wire mesh covered by a mortar plaster, at both faces, connecting to each other, with adequate wall intersection details.
I have tested in the structural lab.
PAtricio Placencia
It is pathetic. The Government should have strict law to enforce the Structural Engineers and the Builders for the Design and Construction of all types of Constructions at least in future. We cannot blame the economy. Safety is very important. How much we are crying and weeping now from India for those affected people. Prof. Sundararajulu, Professional Structural Engineer.
They may have used too much sand in the cement mixture.