Earthquakes in India: Major Zones and Historical Events

The ground beneath our feet feels stable, but across large parts of the subcontinent, it is anything but. Sitting at the collision zone of two massive tectonic plates, India has been shaken by some of the world’s deadliest earthquakes. Understanding where these tremors strike, why certain regions are more vulnerable, and what past events have taught us is central to disaster preparedness today.

Why India is seismically vulnerable 🔗

India’s seismic story is rooted in geology. The Indian plate continues to push northward into the Eurasian plate at roughly 5 centimetres a year, a slow but relentless movement that built the Himalayas and keeps building stress along fault lines. This accumulated strain releases as earthquakes, sometimes catastrophically.

The scale of exposure is enormous. According to the National Institute of Disaster Management, seismologists have historically classified about 59% of India’s landmass as prone to earthquakes of varying magnitudes, with roughly 11% in very high risk zone V, 18% in high risk zone IV and 30% in moderate risk zone III. More recent assessments place an even larger share of the country under moderate to high seismic risk.

The seismic zoning map of India 🔗

To guide construction standards and disaster planning, the Bureau of Indian Standards (BIS) divides the country into seismic zones based on expected intensity of shaking. Until recently, this classification covered four zones: II, III, IV and V, ranging from low to very high damage risk. The Modified Mercalli intensity associated with these zones was VI or less, VII, VIII, and IX or above, respectively, corresponding to the Maximum Considered Earthquake.

Zone V: The very high risk zone 🔗

Zone V covers the areas most likely to experience the strongest shaking. Roughly 11% of the country’s area falls under Zone V, and these regions sit close to active plate boundaries where earthquakes of magnitude 7 or above are possible. The Kashmir Valley, the Western and Garhwal Himalayas, North Bihar, the North-East, the Rann of Kutch and the Andaman and Nicobar Islands are all part of this zone.

Zone IV: High risk regions 🔗

Zone IV is the next tier down but still carries substantial hazard. It includes Jammu and Kashmir, Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, parts of the Indo-Gangetic plains such as North Punjab, Chandigarh, western Uttar Pradesh and a major portion of Bihar, along with Delhi. The capital’s position here is particularly concerning given its dense population and the age of much of its building stock.

Zones III and II: Moderate and low risk 🔗

Zone III accounts for around 30% of India and includes major cities like Mumbai, Kolkata and Chennai. While labelled moderate, history has shown that these zones are not immune, something the 1993 Latur earthquake made painfully clear. Zone II, the lowest hazard category, covers areas where seismic activity is minimal and damage from earthquakes is generally limited.

A new Zone VI 🔗

The zoning framework has recently been updated. In a major revision of the earthquake design code, the BIS introduced a dedicated Zone VI for regions facing extremely high seismic hazard, with the entire Himalayan arc from Jammu and Kashmir to Arunachal Pradesh now falling within this category. The revised map uses Probabilistic Seismic Hazard Assessment, which is considered more scientifically robust than the older approach that relied on historical epicentres and broad geological features. Under the new classification, any town sitting on the boundary between two zones is automatically placed in the higher-risk one.

The Bhuj earthquake of 2001: A defining disaster 🔗

Few disasters have shaped India’s approach to earthquake preparedness like the Bhuj earthquake. On the morning of 26 January 2001, as the country prepared for Republic Day celebrations, a massive tremor tore through Gujarat’s Kutch district.

What happened 🔗

The earthquake struck at 8:46 am IST with its epicentre near the village of Chobari in Bhachau Taluka of Kutch district. According to scientific records, it measured 7.7 on the moment magnitude scale, occurred at a depth of about 17 kilometres, and registered a maximum Mercalli intensity of XII, the highest possible rating. Crucially, this was an intraplate earthquake, occurring well within the Indian plate rather than at its boundary.

The human and material cost 🔗

The destruction was staggering. The earthquake killed more than 20,000 people, injured over 150,000 and left hundreds of thousands homeless while destroying or damaging more than a million buildings. The Kutch district was the epicentre of suffering, with nearly 1,600 additional deaths reported in cities including Ahmedabad, Rajkot, Jamnagar, Surat, Gandhinagar and Vadodara.

Infrastructure losses were equally devastating. Over 1.2 million houses in 8,000 villages and 490 towns were damaged or destroyed, along with 12,000 schools and 2,000 health facilities. Total property damage was estimated at $7.5 billion. Widespread soil liquefaction occurred across the Rann of Kutch, with sand boils fountaining saline groundwater two to three metres into the air in dry lakebeds.

Lessons that reshaped policy 🔗

In the aftermath, the Gujarat government launched a large-scale reconstruction programme. By 2003, about 94% of eligible houses had been repaired and more than half of those slated for complete reconstruction had been rebuilt. Bhuj itself was replanned with wider roads to enable emergency access, using a land readjustment approach across eight town planning schemes.

The disaster also prompted Gujarat to be reclassified into the highest-risk seismic zone, a reminder that regions once considered moderately safe can experience catastrophic shaking. It accelerated India’s broader conversation about enforcing earthquake-resistant building codes and paved the way for institutional reforms, including the eventual passage of the Disaster Management Act in 2005.

The Kashmir earthquake of 2005 🔗

Just four years after Bhuj, another major earthquake struck the northern frontier. On 8 October 2005, a magnitude 7.6 quake ruptured the Hazara-Kashmir syntaxis of the Himalayan fold belt.

The event and its geography 🔗

The epicentre lay approximately 19 kilometres northeast of Muzaffarabad in Pakistan-administered Kashmir, and tremors were felt as far away as Delhi and Punjab. On the Indian side of the Line of Control, the districts of Baramulla, Kupwara and Poonch bore the brunt, with Uri and Tangdar suffering the heaviest destruction.

The scale of devastation 🔗

While the worst of the toll fell on Pakistan, the impact on India was severe. At least 1,350 people were killed and 6,266 injured in Jammu and Kashmir, with at least 32,335 buildings collapsing in cities including Anantnag and Srinagar. In Uri alone, fifteen hundred houses were destroyed, and tens of thousands of people were rendered homeless as winter approached.

The terrain amplified the tragedy. Landslides and rockfalls blocked roads and highways, cutting off access to affected areas for days and severely hampering rescue efforts. According to NASA’s Earthdata, the earthquake produced a surface rupture extending for seventy-five kilometres, something scientists noted was a first among recorded earthquakes in the Himalayan seismic zone.

Why the damage was so severe 🔗

Beyond the magnitude itself, the high casualty count was linked to poor construction, with stone and mortar homes common in the region collapsing rapidly during the shaking. Harsh weather, difficult mountain access and aftershocks, many of them above magnitude 4, continued to complicate relief operations for weeks.

Other significant earthquakes in India’s history 🔗

Bhuj and Kashmir are only two chapters in a longer story. The 1950 Assam-Tibet earthquake, at an estimated magnitude of 8.6, remains India’s strongest recorded earthquake. The 1993 Latur earthquake, a magnitude 6.2 event in a region classified as Zone III, killed nearly 10,000 people and proved that stable peninsular areas cannot be considered risk-free. Other notable events include the 1905 Kangra earthquake, the 1999 Chamoli earthquake, the 2011 Sikkim earthquake and the 2015 Nepal earthquake, which also caused damage in Bihar and surrounding states.

Building earthquake resilience 🔗

The common thread across these disasters is that buildings, not earthquakes themselves, kill people. Unreinforced masonry, soft-storey construction, lack of adherence to building codes, and construction on unsuitable soils multiply the human cost of any tremor.

The role of earthquake-resistant construction 🔗

India’s response has centred on updating and enforcing design codes. The BIS framework, most notably IS 1893 for earthquake-resistant design, provides the engineering basis for construction in each seismic zone. The National Disaster Management Authority has issued guidelines for retrofitting vulnerable buildings, especially schools, hospitals and lifeline structures. Agencies including the BIS, the Building Materials and Technology Promotion Council and HUDCO have circulated construction guidelines to administrators and the public in earthquake-prone areas.

Preparedness beyond buildings 🔗

Structural measures alone are not enough. Effective preparedness combines community-level awareness, mock drills, early warning systems for aftershocks and tsunamis, trained search-and-rescue teams such as the National Disaster Response Force, and robust land-use planning that keeps critical infrastructure off unstable soils. The National Center for Seismology under the Ministry of Earth Sciences monitors earthquake activity around the clock and contributes data that informs both real-time response and long-term zoning decisions.

Challenges that remain 🔗

Despite progress, gaps persist. Much of India’s existing building stock predates modern seismic codes, and enforcement in rural and informal urban construction is inconsistent. The seismic gap in the central Himalayas, where a major rupture has not occurred for several centuries, is a particular concern. Rapid urbanisation on alluvial soils, especially in Delhi and parts of the Indo-Gangetic plain, increases the risk of liquefaction and amplified shaking.

What do you think? Given that nearly three-quarters of Indians now live in seismically active regions, how should policymakers balance the cost of enforcing stricter building codes against the pace of urban growth? And what role can ordinary citizens play in closing the gap between seismic science and ground-level preparedness?

References

1. https://nidm.gov.in/safety_earthquake.asp
2. https://en.wikipedia.org/wiki/Earthquake_zones_of_India
3. https://indiatlas.com/earthquake-zones-in-india/
4. https://www.clearias.com/new-seismic-zonation-map-of-india/
5. https://en.wikipedia.org/wiki/2001_Gujarat_earthquake
6. https://www.britannica.com/event/Bhuj-earthquake-of-2001
7. https://www.britannica.com/event/Kashmir-earthquake-of-2005
8. https://pmc.ncbi.nlm.nih.gov/articles/PMC3068802/
9. https://www.earthdata.nasa.gov/news/feature-articles/when-earth-moved-kashmir
10. https://studyhub.net.in/geology/seismic-zones-india-earthquake-risk-map/
11. https://www.pib.gov.in/PressReleasePage.aspx?PRID=1740656&reg=3&lang=2