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Delhi Earthquake Sparks Alarm

Syllabus

GS 1: Physical Geography

Why in the News?

Recently, a 4.4 magnitude earthquake hit Delhi on July 10, 2025, exposing the capital’s fragile infrastructure and highlighting India’s urgent need for nationwide seismic resilience and strict enforcement of building codes. This event has brought disaster management and earthquake preparedness to the forefront of national concern.

Introduction

  • The earthquake that struck Delhi on July 10, 2025, measuring 4.4 on the Richter Scale, may not have caused major damage, but it has once again exposed India’s seismic vulnerability.
  • The capital city’s weak infrastructure and lack of preparedness underline the urgent need to strengthen building codes and invest in earthquake resistant buildings, emphasizing the importance of proper structural design and adherence to the national building code.

July 2025 Tremor: A Warning Sign

  • The earthquake occurred at 9:04 a.m. on July 10, 2025.
  • It measured 4.4 magnitude on the Richter Scale.
  • The epicentre was 20 kilometres southwest of Delhi.
  • The tremor originated at a shallow depth of five kilometres.
  • While the damage was minimal, the quake was a stark reminder of Delhi’s fragile infrastructure.
  • Over 80% of buildings in Delhi, especially those built before 2000, do not follow the national building codes, raising concerns about structural safety and the need for comprehensive structural audits.

A Pattern of Seismic Activity Across Asia

  • The July tremor followed several other earthquakes in Asia since March 2025.
  • These included:
    • A 7.7 magnitude earthquake in Myanmar and Thailand.
    • Tremors in Tibet.
    • Seismic activity in Greece and along the India-Myanmar border.
  • These events point to increasing tectonic movement in the region, highlighting the need for improved seismic hazard assessment and regular structural audits.
  • India, situated on a highly active tectonic plate, is especially at risk.

Why India Is at High Risk

  • The Indian Plate moves northward, colliding with the Eurasian Plate.
  • This collision forms the Himalayas and causes frequent seismic activity.
  • Delhi is in Seismic Zone IV, a high-risk area requiring special attention to earthquake protection measures and stringent building codes.
  • The peak ground acceleration (PGA) for Delhi is 0.24g.
  • The region is overdue for a “Great Himalayan Earthquake” (magnitude 8+).
  • Over 300 million people in northern India, Nepal, and Bhutan could be affected, emphasizing the need for comprehensive disaster preparedness and robust structural design.

Delhi’s Infrastructure: Fragile and Unprepared

  • Delhi has over 33.5 million residents and more than 5,000 high-rise buildings.
  • Many of these buildings were constructed without following IS 1893:2016 seismic code and lack proper structural safety certificates.
  • Key requirements under this code include:
    • Ductile detailing.
    • Shear wall construction.
  • The Time Use Survey highlights poor implementation of building codes and construction standards.
  • Historical quakes like Bhuj (2001) and Nepal (2015) show how devastating poor planning can be, underscoring the importance of structural engineering and regular structural audits in earthquake-prone areas.

Seismic Zones Beyond Delhi

  • India has seismic zones ranging from Zone II to Zone V.
  • Northeast India lies in Zone V, with PGA over 0.36g, requiring extensive seismic strengthening measures and regular structural audits.
  • Key quake events in 2025 include:
    • Mandalay (Myanmar) quake of 7.7 magnitude on March 28.
    • A 5.2 magnitude quake on May 17 near the India-Myanmar border.
    • A 5.7 magnitude quake in Tibet on May 12, affecting Sikkim.
  • The Andaman and Nicobar Islands are also in Zone V and vulnerable to tsunamis.
  • Even distant tremors, like the 6.2 magnitude quake in Greece (May 22), reflect a volatile global tectonic environment.

Urbanisation and Earthquake Risk in Delhi

  • Delhi’s rapid urbanisation adds to its seismic vulnerability, necessitating stricter enforcement of building codes.
  • East Delhi is built on liquefaction-prone soil, increasing the risk of structural damage during earthquakes.
  • Many high-rises are poorly designed and constructed, lacking proper seismic upgrading and structural safety certificates.
  • The IndiaQuake app offers real-time updates but is underutilised.
  • There is a lack of public awareness and poor enforcement of codes, highlighting the need for improved earthquake safety education and mandatory structural audits.

Comparisons

  • Bangkok has updated seismic codes since 2007, focusing on earthquake resistant design and structural safety.
  • Myanmar’s 2025 quake saw major damage due to poor enforcement of structural safety measures and building codes.
  • India needs to bridge this gap with better implementation and awareness of seismic safety practices, including mandatory structural audits and structural safety certificates.

Himalayan Seismic Gap: A Ticking Time Bomb

  • The Himalayan seismic gap has not seen a major quake since the 1905 Kangra event.
  • The 2015 Nepal quake (Gorkha quake) is a reminder of the risks.
  • The strain continues to build along the fault lines, increasing seismic forces.
  • A future event could be catastrophic for Delhi and surrounding regions, necessitating urgent seismic upgrading of existing structures and improved structural design practices.

Steps to Improve Earthquake Resilience

  • Enforce seismic building codes strictly, especially IS 1893:2016.
  • Retrofit old buildings using methods like:
    • Steel jacketing.
    • Deep pile foundations.
  • Delhi Development Authority (DDA) should accelerate compliance inspections and issue structural safety certificates.
  • Expand early warning systems to cover rural and high-risk areas.
  • Educate the public on:
    • Emergency kits.
    • Safe evacuation plans.
    • Earthquake-safe construction and structural design principles.

Region-Specific Measures

Guwahati (Zone V)

  • Avoid construction on Brahmaputra floodplain.
  • Use base isolation for critical buildings to enhance earthquake protection.

Bhuj (Gujarat)

  • Increase investment in retrofitting and structural audits.
  • Form local disaster response teams.

Andaman & Nicobar

  • Enhance tsunami preparedness.
  • Build sea-level monitoring systems.

Learning from the World

Bangkok

  • Uses high-strength concrete (30MPa-40MPa).
  • Has ductile detailing.
  • Faces lower seismic risk but high preparedness through advanced structural design.

Myanmar

  • 2025 damage worsened by use of unreinforced masonry.

Uruguay and South Korea:

  • Have successfully integrated disaster-resilient building codes.

Financial Commitment Needed

  • Experts estimate that India needs to invest ₹50,000 crore annually for retrofitting and structural audits.
  • Investment is required in both urban and rural areas to improve building durability and structural safety.
  • Strengthening infrastructure now will save lives and reduce economic losses later.

Role of Government and Citizens

  • Government of India must lead policy enforcement and disaster management initiatives, including mandatory structural safety certificates.
  • Public awareness campaigns should be launched to improve earthquake preparedness and understanding of building codes.
  • Schools, hospitals, and other critical infrastructure must be prioritised for seismic strengthening and regular structural audits.
  • Citizens should:
    • Check building safety.
    • Prepare emergency plans.
  • Demand compliance from local builders and authorities regarding tremor safety measures and structural design standards.

Conclusion

The Delhi earthquake is a timely reminder of India’s vulnerability. Building seismic resilience through strong policies, strict enforcement of building codes, and public cooperation is essential to prevent a future disaster and protect millions of lives. Implementing comprehensive earthquake resistant design strategies, conducting regular structural audits, and improving overall structural safety are crucial steps in safeguarding India’s urban centers against seismic threats.

Source:The Hindu

Mains Practice Question

With reference to the Himalayan seismic gap and increasing tectonic activity in Asia, critically analyse India’s current preparedness for a ‘Great Himalayan Earthquake’. Discuss the role of structural engineering, earthquake resistant buildings, and strict adherence to the national building codes in mitigating potential disaster impacts.