A record-breaking supershear rupture with devastating consequences

The magnitude 7.7 earthquake that struck Myanmar on March 28, 2025, was an exceptionally powerful event, marked by a record-breaking 460 km supershear rupture — the longest ever recorded for an earthquake of this magnitude. This disaster, which occurred at a shallow depth of 10 km along the strike-slip Sagaing Fault, intensified the ground shaking.

By Olaf König

Published on July 9, 2025

Four months after the earthquake struck Myanmar on March 28, 2025, the country remains scarred by one of the most devastating human disasters in its recent history. The quake claimed over 3,700 lives, destroyed entire communities, and crippled critical infrastructure. Hundreds of thousands of people were left without shelter, forced to live outdoors under the constant threat of aftershocks. The impact extended as far as Thailand, where dozens were killed in Bangkok, highlighting the regional scale of the disaster.

A Devastating Reach: How the Earthquake Shook Myanmar and Beyond

The 2025 M7.7 earthquake’s epicenter near Mandalay triggered intense ground shaking along the Sagaing Fault, exposing tens of millions to severe seismic waves — with the highest impact concentrated in Myanmar’s most densely populated corridor.

Shake intenstiy

Weak

Severe

INDIA

MYANMAR

Population

density

BANGLADESH

CHINA

Epicenter

Mandalay

VIETNAM

Sagaing Fault

LAOS

Bay of Bengal

Yangon

THAILAND

Gulf of Martaban

Bangkok

CAMBODIA

100 km

Shake intenstiy

Weak

Severe

Population

density

INDIA

MYANMAR

BANGLADESH

CHINA

Epicenter

Mandalay

Sagaing Fault

LAOS

Bay of Bengal

Yangon

THAILAND

Gulf of Martaban

Bangkok

100 km

The earthquake left nearly 200,000 people displaced across Myanmar, forcing many to live outdoors in fear, as frequent aftershocks and the approaching cyclone season added to their insecurity. The disaster caused widespread destruction of infrastructure, damaging thousands of homes, schools, hospitals, and roads, with losses estimated at $1.9 billion. It struck a country already in deep crisis, where years of civil conflict and the collapse of basic services had left millions in need of humanitarian aid. As a result, urgent needs for shelter, food, clean water, and medical care remain unmet, particularly in hard-hit areas like Mandalay.

In the weeks following the 7.7-magnitude earthquake, central Myanmar was shaken almost daily by aftershocks, including one as strong as magnitude 6.7, prompting many people to sleep outdoors in fear of further collapses. Monitoring of the seismic activity was severely hindered by the prior removal of most seismometers in the country due to challenges linked to the pandemic and the military coup.

The March 28, 2025, earthquake in Myanmar caused extraordinary ground displacement, with surface ruptures stretching over 460 km—twice the expected length for a quake of magnitude 7.7. Ground movement reached up to 5 meters in opposite directions, and the rupture, visible from satellites, cut through major areas including the capital Naypyitaw. Scientists believe the event was a rare "supershear" earthquake, where the rupture moved faster than the seismic waves it generated, similar to a sonic boom. This phenomenon likely amplified the shaking over long distances, helping explain why serious structural damage occurred as far away as Bangkok, nearly 1,000 km from the epicenter.

How the Ground Shifted Along Myanmar’s Major Fault

The M7.7 earthquake triggered more than 30 aftershocks along the Sagaing Fault, displacing the ground by up to two meters. Northern Myanmar’s densely populated corridor experienced the most dramatic surface movement.

N

10 km

to North

2m

Measured ground

movement

0m

Population

density

2m

Rivers and lakes

to South

Magnitude of

earthquake

and aftershocks

M >= Mag. 4

(30 days)

7

6

Mogok

91 k

5

Major roads

4

Population in the

main cities

1.2 M

Shwebo

500k

89 k

100k

Strike-slip

Sagaing Fault

Mainshock

M 7.7

Pyin Oo Lwin

Mandalay

117 k

1,2 M

Sagaing

79 k

Mandalay, Myanmar’s second largest

city, lay near the mainshock and

saw numerous aftershocks.

Kyaukse

50 k

Myingyan

142 k

Ground displacement

toward the north

Meiktila

177 k

MYANMAR

Yamethin

60 k

Taungdwingyi

70 k

Ground displacement

toward the south

Nay Pyi Taw

925 k

No satellite

imagery

Pyinmana

97 k

Taungoo

107 k

Pyu

40 k

End of the fault rupture,

which extends for more

than 460 km

N

10 km

to North

2m

Measured ground

movement

0m

Population

density

2m

Rivers and lakes

to South

Magnitude of

earthquake

and aftershocks

M >= Mag. 4

(30 days)

7

Mogok

6

91 k

5

Major roads

4

Population in the

main cities

1.2 M

Shwebo

89 k

500k

100k

Strike-slip

Sagaing Fault

Mainshock

M 7.7

Pyin Oo Lwin

Mandalay

117 k

1,2 M

Sagaing

79 k

Mandalay, Myanmar’s second largest

city, lay near the mainshock and

saw numerous aftershocks.

Kyaukse

50 k

Myingyan

142 k

Ground displacement

toward the north

Meiktila

177 k

MYANMAR

Yamethin

60 k

Taungdwingyi

70 k

Ground displacement

toward the south

Nay Pyi Taw

925 k

No satellite

imagery

Pyinmana

97 k

Taungoo

107 k

Pyu

40 k

End of the fault rupture,

which extends for more

than 460 km