Bengaluru earthquake: Magnitude 3 tremor hits city, no need to panic; know causes, dos and don'ts

Bengaluru was jolted by a mild earthquake measuring magnitude 3.0 on the Richter scale on Friday morning, October 23. According to the National Centre for Seismology (NCS) and the Karnataka State Natural Disaster Monitoring Centre (KSNDMC), the tremor was recorded at 9:01 am, with its epicentre located north of Timmojanahalli village in the Tubagere Gram Panchayat limits of Doddaballapur taluk in Bengaluru Rural district. The earthquake occurred at a depth of approximately 10 km, according to the NCS.

The tremors may have been felt within a radius of 20 to 30 km from the epicentre. However, authorities said the earthquake was of low intensity and was not expected to cause damage to the local community. The epicentre falls in Seismic Zone II, which is classified as a relatively low-seismic-risk zone. Authorities have urged residents not to panic and to rely on official updates rather than rumours.

What triggered the Bengaluru earthquake?

Earthquakes generally occur when stress accumulated in the Earth's crust is suddenly released as rocks move along faults or fractures, generating seismic waves that cause the ground to shake. Although India experiences earthquakes due to the movement and interaction of tectonic plates, smaller tremors can also occur within the Indian Plate as stress builds up along existing geological faults.

In Bengaluru's case, the NCS recorded a magnitude 3.0 earthquake at a depth of around 10 km. However, the precise geological fault or mechanism responsible for Friday's tremor has not been established in the available official information. Therefore, it would be premature to attribute the earthquake to a specific fault, construction activity or any other local trigger.

A magnitude 3.0 earthquake is generally considered minor and is unlikely to cause significant damage, although its effects can vary depending on depth, distance from the epicentre, local ground conditions and the quality of buildings.

Can Bengaluru experience more earthquakes?

Karnataka is not among India's most seismically active regions, but low-intensity earthquakes can still occur. Bengaluru's classification in Seismic Zone II indicates a relatively low level of seismic hazard, not an absence of earthquake risk.

The occurrence of a minor tremor does not, by itself, indicate that a larger earthquake is imminent. Scientists cannot reliably predict the exact time, location or magnitude of a future earthquake. Residents should remain informed, follow official advisories and understand basic earthquake safety measures.

Earthquake dos and don'ts: What should you do during tremors?

The National Centre for Seismology recommends staying calm, protecting yourself during shaking and avoiding actions that could expose you tofalling debris or other hazards.

Dos during an earthquake

• If indoors, drop, cover and hold on: Get under a sturdy table or desk, protect your head and neck, and hold on until the shaking stops.
• Stay away from windows: Keep clear of glass, balconies, exterior walls and heavy objects that could fall.
• If outdoors, move to an open area: Stay away from buildings, trees, electric poles, overhead wires and other potential hazards.
• If driving, stop safely:

 Pull over away from buildings, bridges, flyovers and power lines, and remain inside the vehicle until the shaking stops.

After the tremor, check for damage: Look for cracks, falling debris, damaged electrical wiring and gas leaks. Be alert for possible aftershocks.

Follow official updates: Monitor advisories from the NCS, KSNDMC and local authorities.

Don'ts during an earthquake

• Do not panic or rush towards exits: Sudden movement and overcrowding near staircases and doors can increase the risk of injury.
• Do not use lifts: Use stairs only after the shaking has stopped and it is safe to evacuate.
• Do not stand near glass or heavy furniture: These may break, topple or fall during shaking.
• Do not jump from windows or balconies: This can cause serious injuries, particularly in multi-storey buildings.
• Do not enter damaged buildings: Structural damage may make them unsafe, even after the tremors stop.
• Do not use open flames if a gas leak is suspected: Avoid operating electrical switches, leave the area and contact emergency services.
• Do not spread unverified information: Rely on official sources for updates and safety instructions.

What should you do after an earthquake?

Once the shaking stops, check yourself and others for injuries and provide first aid if necessary. If you notice structural damage, gas leaks or exposed electrical wires, move to a safe location and alert the relevant authorities. Avoid damaged buildings and be prepared for possible aftershocks.

Residents should also secure heavy furniture, keep emergency supplies handy and familiarise themselves with safe places inside their homes and workplaces. While Friday's mild earthquake is not, by itself, a reason for alarm, preparedness and reliable information remain essential for public safety.