Myanmar earthquake: 5.5 magnitude aftershock rattles nation again - What are they? Why are they dangerous? Explained

Myanmar earthquake: Another quake of 5.5 magnitude struck near Meiktila, a small city in central Myanmar, on Sunday morning, according to the U.S. Geological Survey. 

The latest quake is one of the biggest aftershocks Myanmar has suffered amid the nation's rescue efforts following the devastating 7.7-magnitude earthquake on March 28, which claimed the lives of 3,649 people, reported AP.

Myanmar hit by 468 aftershocks

A total of 468 aftershocks have been recorded following the massive 7.7-magnitude earthquake that struck Myanmar on March 28, shows data from the Thai Meteorological Department's Earthquake Observation Division.

But, what are aftershocks? Why are they dangerous? LiveMint brings you a detailed coverage.

What is an aftershock?

Aftershocks are themselves earthquakes, but they are more accurately described as the lower-magnitude (or lower-intensity) tremors that follow the principal earthquake

According to Britannica, when an earthquake occurs, some of the energy released from the sudden fracturing of rocks is transferred to nearby rocks, which leads to additional stresses like pushing, pulling, and twisting. When these stresses become massive for the rocks to withstand, they break as well, releasing more pent-up energy and creating new faults.

The whole process of pulling and twisting causes earthquakes to trigger aftershocks, which in turn leads to multiple, yet small aftershocks.

Why are aftershocks dangerous?

Aftershocks tend to be the most severe and happen more frequently in the hours and days that follow an earthquake, stated Britannica.

Experts have advised that aftershocks are common in the immediate aftermath of an earthquake, typically within the first two hours.

Citing statistical data, Nation Thailand indicated the risk of a further significant earthquake, due to the aftershocks, within the next 24 hours.

Myanmar, Thailand earthquake

Myanmar declared a state of emergency in its capital city Naypyitaw, and six states, following the devastating earthquake on March 28. The tremors of the quake were also felt in Thailand.

While China, Bangladesh also experienced the tremors of the Myanmar earthquake, Thailand witnessed severe damage, with sky-scrapers tumbling down.

Myanmar hospital turned into ‘mass casualty area’

The devastating earthquake turned a major hospital in Myanmar's capital city Naypyitaw into a ‘mass casualty area,’ reported AFP. Over 1700 people have been killed so far.

"Many people were injured, have never seen something like this" said a doctor at the 1,000-bed general hospital in Myanmar's capital city Naypyidaw, reported AFP.

Myanmar, Thailand declare state of emergency

Both Myanmar and Thailand declared a state of emergency, after the devastating earthquake sent skyscrapers tumbling, injuring over thousands.

7.1 magnitude earthquake strikes near Tonga

A powerful 7.1 magnitude earthquake struck near Tonga early Monday, prompting a tsunami warning for the Pacific island nation.

According to the US Geological Survey (USGS), the earthquake occurred approximately 100 kilometers (62 miles) northeast of Tonga’s main island.