Vulnerability of Delhi-NCR to Earthquakes
Kartavya Desk Staff
Source: HT
Context: A 4.4 magnitude earthquake with epicentre in Jhajjar (Haryana) shook Delhi-NCR recently, reviving concerns about the region’s high seismic vulnerability.
About Vulnerability of Delhi-NCR to Earthquakes:
• What is Delhi’s seismic risk? Delhi lies in Seismic Zone IV, classified as a high-damage risk zone by the Bureau of Indian Standards (BIS). The region is prone to moderate to strong earthquakes, with magnitudes reaching 5–6 occasionally and potential for 7+ magnitude events.
• Delhi lies in Seismic Zone IV, classified as a high-damage risk zone by the Bureau of Indian Standards (BIS).
• The region is prone to moderate to strong earthquakes, with magnitudes reaching 5–6 occasionally and potential for 7+ magnitude events.
• How vulnerable is Delhi-NCR? Dense population, unregulated construction, and aging infrastructure make Delhi highly susceptible to earthquake-induced damage. The National Center for Seismology (NCS) has highlighted frequent tremors from shallow-focus quakes due to nearby active faults.
• Dense population, unregulated construction, and aging infrastructure make Delhi highly susceptible to earthquake-induced damage.
• The National Center for Seismology (NCS) has highlighted frequent tremors from shallow-focus quakes due to nearby active faults.
• Reasons Behind Earthquake Vulnerability: Proximity to Himalayan Frontal Thrust: Delhi is close to the tectonically active Himalayan belt, where the Indian and Eurasian plates collide, generating deep-seated stress. Active Fault Lines Across NCR: Major fault systems include the Delhi-Haridwar Ridge, Delhi-Moradabad Fault, Sohna Fault, and Mahendragarh-Dehradun Fault, increasing seismic risk. Subsurface Weak Zones: Seismic studies identify lineaments like the Yamuna and Ganga River faults, indicating deep crustal weaknesses. Historical Seismicity Pattern: Delhi has experienced at least five quakes of 5.5–6.7 magnitude since 1720, indicating recurring seismic events. Rapid Urbanisation Without Seismic Code Compliance: Unplanned growth and lack of enforcement of IS-1893 seismic design codes elevate structural vulnerability.
• Proximity to Himalayan Frontal Thrust: Delhi is close to the tectonically active Himalayan belt, where the Indian and Eurasian plates collide, generating deep-seated stress.
• Active Fault Lines Across NCR: Major fault systems include the Delhi-Haridwar Ridge, Delhi-Moradabad Fault, Sohna Fault, and Mahendragarh-Dehradun Fault, increasing seismic risk.
• Subsurface Weak Zones: Seismic studies identify lineaments like the Yamuna and Ganga River faults, indicating deep crustal weaknesses.
• Historical Seismicity Pattern: Delhi has experienced at least five quakes of 5.5–6.7 magnitude since 1720, indicating recurring seismic events.
• Rapid Urbanisation Without Seismic Code Compliance: Unplanned growth and lack of enforcement of IS-1893 seismic design codes elevate structural vulnerability.