The USGS has confirmed a magnitude 4.8 earthquake with its epicentre 56 km E of Yairipok, India, occurring at 01:28 UTC on Monday, October 12, 2026. The event's focal depth — 78.2 km — is a key factor in understanding how this earthquake was experienced at the surface.
Why Depth Matters
With a focal depth of 78.2 km, this earthquake falls into the intermediate depth category (70–300 km). At this depth, seismic waves travel further before reaching the surface, spreading energy over a wider area. While shaking intensity at the epicentre is somewhat reduced compared to a shallow event of equal magnitude, an intermediate earthquake can be felt across a much larger region.
Depth is one of the most critical but least discussed parameters of any earthquake. Two earthquakes of identical magnitude can have dramatically different surface effects depending on how deep the rupture originates. Significant damage can occur to vulnerable structures — particularly unreinforced masonry, old adobe buildings, and poorly maintained older construction. Well-engineered modern buildings are designed to withstand this level of shaking with minimal structural impact, though contents may shift and non-structural elements (ceilings, partitions) can be damaged.
Magnitude 4.8: What the Science Says
On the moment magnitude scale, 4.8 represents a moderate earthquake. Moderate earthquakes are felt by virtually everyone near the epicentre. Strong shaking lasting 10–30 seconds can topple unsecured items, crack plaster, and cause poorly anchored objects to fall. Aftershocks are common following moderate events.
A magnitude 4.8 earthquake releases approximately approximately 30,000 tonnes of TNT — comparable to the Hiroshima atomic bomb of energy. For comparison, this exceeds the energy released by most conventional explosive events and is sufficient to shift tectonic stress in measurable ways across a wide region.
Tectonic Setting
India's seismic hazard stems primarily from the ongoing collision of the Indian Plate with the Eurasian Plate — a process that built the Himalayas and continues to drive intense seismicity across northern India, Nepal, and the Andaman Islands.
This region's seismic history is an important reminder that earthquake risk is a long-term reality that requires sustained preparedness. Notable Indian earthquakes include the 2001 Bhuj earthquake (M7.7, ~20,000 deaths) in Gujarat and the 2015 Gorkha earthquake centred in Nepal (M7.8, ~9,000 deaths) which was strongly felt across northern India. The densely populated Indo-Gangetic Plain, though not directly on a plate boundary, faces amplified shaking from distant Himalayan earthquakes.
Practical Safety Information
Regardless of the earthquake's depth or magnitude, standard safety procedures apply. Keep an earthquake emergency kit accessible at home. It should include at least 72 hours of water (4 litres per person per day), non-perishable food, a first aid kit, torch, battery-powered radio, copies of important documents, and essential medications. Reviewing and restocking this kit annually is strongly recommended.
Understanding the type of building you live or work in is one of the most important steps in earthquake preparedness. Older unreinforced masonry buildings and soft-storey apartment buildings are significantly more vulnerable than modern reinforced concrete or steel-frame structures. If you have concerns, consult a structural engineer.
The National Center for Seismology (NCS) under India's Ministry of Earth Sciences monitors seismic activity and maintains a network of ~100 seismograph stations across the country.
Track This Event
All seismic data for this event is being updated in real time as the USGS refines its measurements. Initial magnitude and depth estimates are sometimes revised as more seismograph stations report in — a process that typically completes within hours of the event. Follow updates on our live earthquake map and consider submitting a felt report if you experienced this earthquake directly.
Comments (0)
No comments yet. Be the first!
Leave a Comment