If you felt the ground shake in Kolkata on the evening of February 3, 2026, you weren’t alone. Thousands across West Bengal and Bangladesh experienced noticeable tremors. While earthquakes can be frightening, understanding the science behind them can help replace panic with prepared awareness.
1. What Exactly Happened?
At approximately 9:04 PM IST, a powerful 6.0 magnitude earthquake struck central Myanmar. Because the quake occurred at a “shallow” depth (about 10 km to 27 km below the surface), the energy didn’t have to travel far to reach the ground, causing the vibrations to spread across hundreds of kilometers.
A second tremor, an aftershock of magnitude 5.3, was felt shortly after at 10:10 PM IST.
2. Why Did Kolkata Feel a Quake in Myanmar?
Kolkata sits on a massive pile of soft river sediment (the Ganges delta). When seismic waves from a distant, powerful earthquake—like the one in Myanmar—travel through the Earth, this soft soil can act like a bowl of jelly, amplifying the shaking.
- The Epicenter: The “starting point” of the quake was near Sittwe, Myanmar, roughly 540 km away from Kolkata.
- The Travel: Even though the quake was far away, the energy was strong enough to reach West Bengal. This is why people in high-rise buildings felt the swaying more than those on the ground; tall buildings tend to “catch” these long-distance seismic waves.
3. Magnitude vs. Intensity: The Simple Difference
It’s easy to get confused by the numbers. Here is the easiest way to think about them:
- Magnitude (The Size): This is the measure of energy released at the source. The Myanmar quake was a 6.0. This number stays the same no matter where you are.
- Intensity (The Feeling): This is how much shaking you actually feel at your location. While the magnitude was 6.0 in Myanmar, the intensity in Kolkata was much lower—likely enough to make fans swing or doors rattle, but not enough to cause structural damage.
4. Essential Safety Guide: What to Do Next Time
Since Kolkata is in Seismic Zone III (Moderate Risk), it is important to know how to react “just now” when a tremor hits.
| If You Are… | Do This | Avoid This |
| Indoors | Drop, Cover, and Hold On. Get under a sturdy desk or table. | Do NOT use elevators. Do NOT run outside while the building is shaking. |
| In a High-Rise | Move to the center of the building, away from windows. | Do NOT rush for the stairs immediately; wait for the initial shaking to stop. |
| Outdoors | Move to an open area away from power lines, trees, and buildings. | Do NOT stand near glass facades or old balconies. |
| Driving | Pull over safely to an open area and stay inside the car. | Do NOT stop under bridges, overpasses, or light posts. |
5. Is There Any Danger Now?
Seismologists often expect aftershocks following a 6.0 magnitude event. These are smaller quakes that happen as the Earth’s crust settles back into place. While they are usually weaker, residents should remain alert over the next 24 to 48 hours.
Pro Tip: Keep a “Go-Bag” near your door with essentials like a flashlight, power bank, basic first-aid, and bottled water.
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