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INTRODUCTION• An earthquake is the result of a sudden release of
energy in the earth crust, that creates seismic waves.• The seismic activity of an area refers to the
frequency, type and size of earthquakes experienced over a period of time.
• The 2011 Sikkim earthquake occurred with a moment magnitude of 6.9, near the border of Nepal and the Indian state of Sikkim, at 18:10 IST on Sunday, 18 September.
• The earthquake was felt across northeastern India, Nepal, Bhutan, Bangladesh and southern Tibet.
• The 2011 Sikkim earthquake occurred centered within the Kanchenjunga Conservation Area, near the border of Nepal and the Indian state of Sikkim.
• As per the Seismic Zonation Map of India 4 the state of Sikkim comes under Seismic Zone IV
• Neighbouring countries of Nepal, Bhutan, Tibet (China) and Bangladesh sustained damage and losses to varying extent .
• Three aftershocks of magnitude 5.7, 5.1 and 4.6 were also felt in Sikkim within 30 minutes of the earthquake.
• The earthquake triggered a large number of landslides and caused significant damage to buildings and infrastructure.
CAUSES
• Damages to the private buildings• Damage to religious Places• Damage to the archaeological structures• Damage to dams and water structures. • Damage to government buildings and Educational
Institutions.
• As the region is mountainous and rains preceded the earthquake, the event triggered massive landslides.
• Damage to buildings and infrastructure caused by landslides was more severe than damage due to direct ground shaking in some regions
• Most buildings had a symmetric and uniform grid of beams and columns. Some buildings that had open stories collapsed, usually at mid-height
CASE STUDY
• The Incident followed by Geological information:• Date of occurrence: 18/09/2011• Time: 18:11 hrs (IST) • Magnitude: 6.8• Focal depth: 10 Km Epiecentre Latitude &
Longitude : 27.7o N & 88.2 o E • Region: Sikkim‐Nepal Border region.
REFERENCE
• "Pager - M 6.9 - Sikkim, India". USGS. 18 September 2011. Retrieved18 September 2011.
• Earthquake claims two lives in Sikkim, The Hindu, 18 September 2011
• Bhardwaj, Mayank (18 September 2011). "Magnitude 6.8 quake in India, several dead". Reuters. Retrieved 18 September 2011.
• Earthquake kills 5 in Nepal, DNA, 18 September 2011.• ITBP buildings collapse, Pegong area badly hit The Economic
Times, 18 September 2011• "Earthquake toll over 80; India 68; as rescue teams reach quake
epicentre". Ndtv.com. Retrieved 22 September 2011.