Experts say that the devastating earthquake in Myanmar on Friday was likely the strongest to hit the country in decades, with disaster modeling suggesting thousands could be dead.
Automatic assessments from the US Geological Survey (USGS) said the shallow 7.7-magnitude quake northwest of the central Myanmar city of Sagaing triggered a red alert for shaking-related fatalities and economic losses.
“High casualties and extensive damage are probable and the disaster is likely widespread,” it said, locating the epicentre near the central Myanmar city of Mandalay, home to more than a million people.
Photo: EPA-EFE
Myanmar’s ruling junta said on Saturday morning that the number killed had passed 1,000, with more than 2,000 injured.
However, the USGS analysis said there was a 35 percent chance that possible fatalities could be in the range of 10,000-100,000 people.
The USGS offered a similar likelihood that the financial damage could total tens of thousands of millions of dollars, warning that it might exceed the GDP of Myanmar.
Photo: AFP
Weak infrastructure will complicate relief efforts in the isolated, military-ruled state, where rescue services and the healthcare system have already been ravaged by four years of civil war sparked by a military coup in 2021.
DANGEROUS FAULT
Bill McGuire, emeritus professor of geophysical and climate hazards at University College London (UCL), said it was “probably the biggest earthquake on the Myanmar mainland in three-quarters of a century.”
Photo: AFP
A 6.7-magnitude aftershock struck minutes after the first and McGuire warned that “more can be expected.”
Rebecca Bell, a tectonics expert at Imperial College London (ICL), suggested it was a side-to-side “strike-slip” of the Sagaing Fault.
This is where the Indian tectonic plate, to the west, meets the Sunda plate that forms much of Southeast Asia — a fault similar in scale and movement to the San Andreas Fault in California.
Photo: AP
“The Sagaing fault is very long, 1,200km, and very straight,” Bell said. “The straight nature means earthquakes can rupture over large areas — and the larger the area of the fault that slips, the larger the earthquake.”
Earthquakes in such cases can be “particularly destructive,” Bell added, explaining that since the quake takes place at a shallow depth, its seismic energy has dissipated little by the time it reaches populated areas above.
That causes “a lot of shaking at the surface,” Bell said.
BUILDING BOOM
Myanmar has been hit by powerful quakes in the past.
There have been more than 14 earthquakes with a magnitude of 6 or above in the past century, including a magnitude 6.8 earthquake near Mandalay in 1956, said Brian Baptie, a seismologist with the British Geological Survey.
Ian Watkinson, from the department of earth sciences at Royal Holloway University of London, said what had changed in recent decades was the “boom in high-rise buildings constructed from reinforced concrete.”
Myanmar has been riven by years of conflict and there is a low level of building design enforcement.
“Critically, during all previous magnitude 7 or larger earthquakes along the Sagaing Fault, Myanmar was relatively undeveloped, with mostly low-rise timber-framed buildings and brick-built religious monuments,” Watkinson said. “Today’s earthquake is the first test of modern Myanmar’s infrastructure against a large, shallow-focus earthquake close to its major cities.”
Baptie said that at least 2.8 million people in Myanmar were in hard-hit areas where most lived in buildings “constructed from timber and unreinforced brick masonry” that are vulnerable to earthquake shaking.
“The usual mantra is that ‘earthquakes don’t kill people; collapsing infrastructure does,’” said Ilan Kelman, an expert in disaster reduction at UCL.
“Governments are responsible for planning regulations and building codes. This disaster exposes what governments of Burma/Myanmar failed to do long before the earthquake, which would have saved lives during the shaking.”
SKYSCRAPER CHECKS
Strong tremors also rocked neighboring Thailand, where a 30-storey skyscraper under construction was reduced to a pile of dusty concrete, trapping workers in the debris.
Christian Malaga-Chuquitaype, from ICL’s civil and environmental engineering department, said the nature of the ground in Bangkok contributed to the impact on the city, despite being some 1,000km from the epicentre in Myanmar.
“Even though Bangkok is far from active faults, its soft soil amplifies the shaking,” he said. “This affects especially tall buildings during distant earthquakes.”
Malaga-Chuquitaype said the construction techniques in Bangkok favoring “flat slabs” — where floors are held only by columns without using strengthening beams, like a table supported only by legs — were a “problematic design.”
He said that initial video analysis of the collapsed tower block in Bangkok suggested this type of construction technique had been used.
“It performs poorly during earthquakes, often failing in a brittle and sudden manner,” he said.
Roberto Gentile, a catastrophe risk modeling expert from UCL, said the “dramatic collapse” of the Bangkok tower block meant that “other tall buildings in the city may require a thorough assessment.”
Bangkok city authorities said they will deploy more than 100 engineers to inspect buildings for safety after receiving more than 2,000 reports of damage.
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