Bangladesh earthquake: 5.7 magnitude quake sends people running from homes

Earthquake Magnitude: 5.7
Epicenter: Nar Singi, Bangladesh (approximately 40 km from Dhaka)
Depth: 10 kilometers
Casualties: At least three deaths, several injuries
Damage: Collapsed makeshift structures, cracks in buildings, railing collapse, structural damage to at least two buildings in Dhaka.
Seismic Risk: Dhaka identified as one of the 20 most prominent cities in danger of a major earthquake.
Fault Lines: Bangladesh has five fault lines, with others near Myanmar and Northeast India that can trigger felt earthquakes within Bangladesh.
Building Standards: Concerns raised about buildings not adhering to guidelines and the vulnerability of old Dhaka structures.
Historical Context: Comparison to a 5.6 magnitude earthquake in December 2023 (further from Dhaka) and a major Assam earthquake nearly a century ago.

1. Main Event and Immediate Impact

A magnitude 5.7 earthquake struck Bangladesh, with its epicenter located in the city of Nar Singi, approximately 40 kilometers from the capital, Dhaka.
The earthquake occurred at a shallow depth of 10 kilometers.
Initial reports indicate that at least three people have died.
The collapse of a railing on a high-story building resulted in the deaths of three pedestrians and injured several others, who were subsequently taken to the hospital.
Makeshift structures were reported to have collapsed.
Tremors were also felt in eastern India.

2. Eyewitness Accounts and Public Reaction

Eyewitnesses described the experience as unprecedented, with one individual stating, "I've never felt an earthquake like this before. Never in my life."
The entire city of Dhaka was in a state of panic.
Social media platforms showed videos depicting cracks in buildings and people fleeing to safety.

3. Expert Warnings and Seismic Vulnerability

Experts have been issuing warnings that Dhaka is among the 20 most prominent cities at risk of a major earthquake.
Bangladesh is situated over five different fault lines.
Additionally, fault lines near Myanmar and Northeast India can trigger earthquakes that are felt within Bangladesh.
The recent earthquake is described as a "wakeup call" by experts who have cautioned residents about future major earthquakes.

4. Structural Concerns and Building Standards

A significant concern highlighted is the inadequate construction of many buildings, with a lack of adherence to established guidelines.
The presence of numerous high-rise buildings and the prevalence of very old, some century-old, structures in Old Dhaka are identified as particular vulnerabilities.
These older buildings are considered highly susceptible to collapse during earthquakes of this magnitude.

5. Historical Context and Previous Seismic Activity

The last significant earthquake experienced by Bangladesh was in December 2023, with a magnitude of around 5.6 in Rambran Lakshampur. However, this event was located much further from the capital and was not as severely felt in Dhaka.
The current earthquake is contrasted with a major Assam earthquake that occurred nearly a century ago, which caused extensive damage to buildings in Dhaka. However, the current event is noted as being unprecedented in recent history for its impact on the capital.

6. Ongoing Assessment and Damage Reports

Reports are still being awaited from other parts of the country regarding structural damage, injuries, and fatalities.
As of the current reporting, the confirmed casualties are three deaths and several injuries due to the railing collapse.
Numerous cracks and structural damage have been observed.
The fire department in Dhaka has identified at least two buildings as being severely structurally damaged.

7. Conclusion and Future Outlook

The magnitude 5.7 earthquake in Nar Singi serves as a stark reminder of Bangladesh's seismic vulnerability, particularly for its densely populated capital, Dhaka.
The event underscores the urgent need for improved building codes, stricter enforcement of construction guidelines, and preparedness measures to mitigate the impact of future seismic events.
The warnings from experts about Dhaka's high risk profile are amplified by this recent occurrence, emphasizing the critical need for proactive action.