A 7.7 magnitude earthquake is classified as a major, high-intensity event capable of causing widespread destruction, severe structural damage, and significant casualties, with energy release equivalent to hundreds of nuclear explosions. It can cause buildings to collapse, damage infrastructure like bridges and roads, and trigger tsunamis, as seen in the 2025 Myanmar event.
A magnitude 7.0 or greater will result in a tsunami alert being issued to certain regions. Major damage to buildings, and structures likely to be destroyed.
A 7.7 magnitude earthquake struck central Myanmar on March 28, 2025. The death toll has surpassed 3,600 people, and 5,000 are injured. The epicenter was located approximately 9.9 miles outside of Sagaing, Myanmar, at a depth of six miles.
Under 6.0 At most slight damage to well-designed buildings. Can cause major damage to poorly constructed buildings over small regions. 6.1-6.9 Can be destructive in areas up to about 100 kilometers across where people live. 7.0-7.9 Major earthquake.
The earthquake directly killed up to 5,352 people in Myanmar and 103 in Thailand, while one person died from shock in Vietnam. Up to 11,404 people were injured and hundreds more were reported missing.
How powerful 7.7 Myanmar earthquake is shedding light on behavior of San Andreas Fault
How much warning will we have before the big one?
If the earthquake is right under our feet, we can't warn people because as soon as we notice it, we get rocked. But if it's a big earthquake on the coast or in California, it would take a few minutes for the crack to spread and rupture near us, giving us two, three or four minutes warning.
6. Myanmar 2025: Magnitude 7.7. A strong 7.7 magnitude earthquake has hit central Myanmar on March 28, 2025. The exact number of deaths and missing people are not yet known, but a rescue team has told the BBC it is “at least in the hundreds.”
What countries were affected by the 7.7 earthquake?
Myanmar is reeling following the huge earthquake which hit the country on Friday, 28 March. The 7.7 magnitude tremor was felt elsewhere, including in Thailand and south-west China.
Earthquakes of this size might produce destructive tsunamis, especially near the epicenter. At greater distances, small sea level changes might be observed. Tsunamis capable of producing damage at great distances are rare in the magnitude range.
A 7.7-Magnitude Earthquake Split the Ground—and Brought an Ancient Structure to the Surface. According to experts, the building may have once been a royal “water palace.” An earthquake in central Myanmar unearthed an ancient structure that may be part of a royal “water palace,” experts say.
The world's deadliest recorded earthquake occurred in 1556 in central China. It struck a region where most people lived in caves carved from soft rock. These dwellings collapsed during the earthquake, killing an estimated 830,000 people.
There is a major fault called the Sagaing fault, which cuts right through Myanmar north to south and is more than 1,200km (746 miles) long. Early data suggests that the movement that caused Friday's 7.7-magnitude earthquake was a "strike-slip" - where two blocks move horizontally along each other.
For powerful quakes of magnitude 7.5 or greater, there is a 37% chance that one or more will occur in the next 30 years in Southern California. Expected Shaking This map builds on the map of likely earthquakes above to show how those earthquakes will shake the region.
What is the longest earthquake ever recorded in the world?
The Sumatra-Andaman Islands earthquake in the Indian Ocean, on 26 December 2004, was the longest-lasting ever recorded. Its duration, monitored by seismometers all over the world, was measured at between 500 and 600 seconds. It had an earthquake magnitude of between 9.1 and 9.3.
Although historical observations dating back several centuries show that damaging earthquakes are relatively rare in the UK, they do occur so it is important to quantify the hazard they pose to the built environment.
Which country is the no. 1 most at risk to disasters?
The Philippines has once again been ranked the most disaster-prone country in the world, topping the 2025 World Risk Index for the 21st consecutive year.
Over 80 per cent of large earthquakes occur around the edges of the Pacific Ocean, an area known as the 'Ring of Fire'; this where the Pacific plate is being subducted beneath the surrounding plates. The Ring of Fire is the most seismically and volcanically active zone in the world.
Historically speaking, earthquakes of this magnitude have caused widespread destruction and loss of life across various regions around the globe—from Haiti in 2010 to Japan in 2011—and they often lead to secondary disasters like tsunamis or landslides that exacerbate their impact.
On average there are about fifteen earthquakes every year with a magnitude of 7 or greater. As with any quasi-random phenomena, the number of earthquakes each year varies slightly from this average, but in general, there are no dramatic variations.
The Big One is predicted to have a 7.2 large-magnitude and high-intensity [5]. The earthquake is predicted to hit Metro Manila from the West Valley Fault, which is 100 km in length (Fig. 1) and would pass through seven cities in Metro Manila including nearby provinces [6].
From the end of 2024, a rumor began that a great earthquake would occur in Japan in July 2025, based on a purported prophecy in the 1999 manga The Future I Saw by Ryo Tatsuki. Its spread in several Asian countries resulted in a notable decline in holiday travel to Japan. Seismologists discounted the prediction.
