The 2011 Sikkim earthquake (also known as the 2011 Himalayan earthquake) occurred with a moment magnitude of 6.9 and was centered within the Kanchenjunga Conservation Area, near the border of Nepal and the Indian state of Sikkim, at 18:10 IST on Sunday, 18 September.[4] The earthquake was felt across northeastern India, Nepal, Bhutan, Bangladesh and southern Tibet.
At least 111 people were killed in the earthquake.[5] Most of the deaths occurred in Sikkim, with reports of fatalities in and near Singtam in the East Sikkim district.[6] Several buildings collapsed in Gangtok.[7] Eleven are reported dead in Nepal, including three killed when a wall collapsed in the British Embassy in Kathmandu.[8] Elsewhere, structural damage occurred in Bangladesh, Bhutan, and across Tibet; another seven fatalities were confirmed in the latter region.
The quake came just a few days after an earthquake of 4.2 magnitude hit Haryana'sSonipat district, sending tremors in New Delhi.[9] The earthquake was the fourth significant earthquake in India of September 2011.[10]
Exactly a year after the original earthquake at 5:55 pm on 18 September 2012, another earthquake of magnitude 4.1 struck Sikkim, sparking panic among the people observing the anniversary of the original quake.[1][11][12][13]
Earthquake
The magnitude 6.9 (Mw) earthquake occurred inland at 18:10 IST on 18 September 2011, about 68km (42mi) northwest of Gangtok, Sikkim at a shallow depth of 19.7km (12.2mi).[4] At this location, the continental Indian and Eurasian Plates converge with one another along a tectonic boundary beneath the mountainous region of northeast India near the Nepalese border. Although earthquakes in this region are usually interplate in nature, preliminary data suggests the Sikkim earthquake was triggered by shallow strike-slip faulting from an intraplate source within the over-riding Eurasian Plate. Initial analyses also indicate a complex origin, with the perceived tremor likely being a result of two separate events occurring close together in time at similar focal depths.
Located at a shallow depth beneath the surface, the earthquake caused strong shaking in many areas adjacent to its epicenter reportedly lasting 30–40 seconds.[14][bettersourceneeded] The strongest shaking occurred to the west in Gangtok and further south in Siliguri, although similar ground motions registering at VI (Strong) on the Modified Mercalli intensity scale were recorded in many smaller towns such as Mangan across elevated regions. Lighter tremors (IV–III) spread southward through populous regions, with these motions reported in the Patna capital of Bihar and as far southwest as Bihar Sharif.[3] Tremors were felt in Assam, Meghalaya, Tripura, parts of West Bengal, Bihar, Jharkhand, Uttar Pradesh, Rajasthan, Chandigarh and Delhi states of India.[15] In Tibet, the earthquake was felt in Shigatse and Lhasa.[16] In all, the earthquake was felt in Nepal, India, Bhutan, Bangladesh and China.
Aftershocks
Sikkim experienced three aftershocks within a span of 30 minutes after the mainshock occurring with magnitudes (Mw) of 5.7, 5.1, and 4.6.[17] Kathmandu experienced two aftershocks that both had a magnitude of 4.8 Mw. The aftershocks had no serious impact in the region. At least 20 aftershocks back-to-back throughout the night caused panic in the Gangtok.[18]
The earthquake struck near a mountainous, albeit very populous region near the Sikkim–Nepal border; most of the structures were highly vulnerable to earthquake shaking.[3] Upon impact, tens of thousands of residents evacuated their homes, and many areas suffered from communication and power outages. The strong shaking caused significant building collapse and mudslides;[14] at least 111 people were confirmed killed and hundreds sustained injuries by the effects of the earthquake. As the earthquake occurred during the monsoon season, heavy rain and landslides made rescue work increasingly difficult.[19]
India
Northern India suffered the worst from the earthquake, with at least 75 people killed.[18] Sixty people were reportedly killed in Sikkim alone.[20] At least seven people died in Bihar while six deaths have been reported in West Bengal.[21] Power supply was disrupted in areas near Sikkim, including Kalimpong of Darjeeling district, and adjoining Jalpaiguri and Cooch Behar districts; the outages were in part blamed on an affected electric substation in Siliguri.[22] Water supply was interrupted in Sikkim. National Highway 31, the major highway linking Sikkim to the rest of India, was damaged.[19] Ten of the dead were workers at a hydroelectric project on the Teesta River.[23]
In India, the total property damage is estimated to be around $22.3 billion USD, making it one of the costliest natural disasters in Indian history.[2][24]
Sikkim
Sikkim earthquake aerial survey by Indian Air Force helicopter
Two buildings of the Indo-Tibetan Border Police in the Pegong areas of North Sikkim collapsed.[25] In Gangtok, many government offices and hospitals were left unusable.[26] The heavy shaking destroyed the villages of Lingzya, Sakyong, Pentong, Bay and Tholong.[27]
Nepal
In the capital city of Nepal, Kathmandu, damage from the earthquake was comparatively limited. Three people were killed when a wall at the British Embassy collapsed, and many others suffered injuries. The shaking effects were more severe in eastern Nepal, closer to the epicenter. There, hundreds of homes sustained significant damage, and due to saturated soil from preceding heavy rains widespread mudslides impacted the region.[28]Sunsari experienced power and telephone communication outages. Two people were killed in the eastern city of Dharan.[29] Overall, in Nepal 6 people died due to the earthquake.
In Tibet, building collapse was reported in Yadong,[33]Dinggyê and Gamba.[16] At least seven people were reported dead in Yadong.[34] Telephone service was interrupted in the seat of Yadong County.[35]
Bhutan
There were no reports of casualties in Bhutan, although cracks in walls and ceilings of houses were reported in Wangthangkha village, Lango and in the town area of Paro. There were also reports of a landslide right after crossing the Isuna Bridge from Paro towards Thimphu, and falling boulders after crossing Chundzom Bridge. Citizens were asked to avoid traveling on the Paro-Thimphu highway. Telecommunications networks were disrupted, with cellular networks unavailable after the quake.[36]
Prime Minister of Bhutan Jigmi Thinley updated in his status[37] as "Phone lines remains clogged reflecting our caring and close knit society. No damage reported from East Bhutan. Four road blocks caused by falling debris are reported on the Chukha–Phuntsholing road. Two homes in Haa report damage with three to four people having suffered minor injury. Thimphu Dzong has sustained some cracks in the Utse and one of the four corner towers. Occupants have been moved out to safer parts. Please remain calm and alert."
Army's rescue operations in earthquake affected area of SikkimArmy personnel distributing relief material to the people in earthquake affected area of Sikkim
Early rescue operations included four teams of National Disaster Response Force been rushed to Sikkim and five more teams were being sent from Kolkata.[17] However, South and West Sikkim remained inaccessible delaying rescue operations owing to landslides caused by rainfall. A group of 14 tourists were rescued by the army from north Sikkim. The army had deployed 72 columns including infantry troops, combat engineers, four Dhruv and five Cheetah helicopters. Rain and landslides had hampered the rescue efforts of workers searching for survivors.[18][38]300 people mostly labourers were given shelter in Chungthang Gurdwara.Food was prepared in gurdwara langar with more than 600 hot meals at all meal times.[39]
Indian former Prime Minister Dr. Manmohan Singh, on 19 September, announced ₹200,000 (US$2,500) as ex-gratia to a family member of those killed in the earthquake and ₹100,000 (US$1,300) for seriously injured. ₹50,000 (US$630) for those grievously injured and ₹25,000 (US$310) for those with minor injuries was announced by Sikkim former chief ministerPawan Chamling.[18] Rescue and relief operations resumed in Sikkim since early in the morning on Tuesday with the weather showing signs of improvement. Road opening parties succeeded in restoring communication along NH31A and work was continuing to repair the North Sikkim Highway to Mangan and Chungthang. Fifteen helicopters were pressed into service to evacuate casualties and deploy rescue and relief columns in the affected areas of north and west Sikkim.
Lt Gen Bikram Singh, GOC-in-C, Eastern Command, also visited the earthquake-affected areas and met his senior staff officers to discuss the progress of Operation Trishakti Madad, the massive operation launched by the Army's 33 Corps to provide relief to those affected by Sunday's earthquake.
According to the Army, nearly 2,000 civilians are being provided shelter at eight Army relief camps at Gangtok, Chungthang, Pegong and Darjeeling. There are 400 others who have sought shelter at relief camps set up by the Indo-Tibetan Border Police. Several children from these camps even returned home on Tuesday and attended school
On Monday, when weather improved, Special Forces personnel slithered from helicopters into affected villages. Medical camps were set up and arrangements were made for casualty evacuation
21 engineering columns of the Army succeeded in restoring partial road connectivity to parts of north Sikkim on Tuesday. Telecommunications and power lines, that snapped due to the earthquake, were also restored.
In spite off all efforts, the highway to Gangtok remained badly affected due to landslides
Sikkim is a state in northeastern India. It borders the Tibet Autonomous Region of China in the north and northeast, Bhutan in the east, Koshi Province of Nepal in the west, and West Bengal in the south. Sikkim is also close to the Siliguri Corridor, which borders Bangladesh. Sikkim is the least populous and second smallest among the Indian states. Situated in the Eastern Himalaya, Sikkim is notable for its biodiversity, including alpine and subtropical climates, as well as being a host to Kangchenjunga, the highest peak in India and third highest on Earth. Sikkim's capital and largest city is Gangtok. Almost 35% of the state is covered by Khangchendzonga National Park – a UNESCO World Heritage Site.
The history of Sikkim begins with the indigenous Lepcha's contact with early Tibetan settlers. Historically, Sikkim was a sovereign Monarchical State in the eastern Himalayas. Later a protectorate of India followed by a merger with India and official recognition as a state of India. Lepchas were the main inhabitants as well as the Ruler of the land up to 1641. Lepchas are generally considered to be the first people, indigenous to Sikkim also includes Darjeeling.
The 1950 Assam–Tibet earthquake, also known as the Assam earthquake, occurred on 15 August and had a moment magnitude of 8.7. The epicentre was located in the Mishmi Hills. It is the strongest earthquake ever recorded on land and is tied with the 2012 Indian Ocean Earthquakes as the strongest Strike-slip earthquake to date.
The 1959 Hebgen Lake earthquake occurred in the western United States on August 17 at 11:37 pm (MST) in southwestern Montana.
The 2008 Peloponnese earthquake killed two people, injured more than 220 and left at least 2,000 people homeless in north western Peloponnese, Greece, on June 8. The earthquake hit the area at 1525 EET, with a moment magnitude of 6.5, according to the Athens Geodynamic Institute. It was strongly felt as far away as in Athens and in parts of southern Italy. The US Geological Survey reported that the quake had a magnitude of 6.4. The epicenter of the tremor was located about 15 miles (32 km) southwest of the Greek port city of Patras, at a depth of 16 km. Interior Minister Prokopis Pavlopoulos dispatched rescue and recovery teams, the Red Cross and units of the army in order to assess the damage and the needs of survivors in the earthquake affected areas.
An earthquake occurred in the province of Sichuan, China at 14:28:01 China Standard Time on May 12, 2008. Measuring at 8.0 Ms, the earthquake's epicenter was located 80 kilometres (50 mi) west-northwest of Chengdu, the provincial capital, with a focal depth of 19 km (12 mi). The earthquake ruptured the fault for over 240 km (150 mi), with surface displacements of several meters. The earthquake was also felt as far away as both Beijing and Shanghai—1,500 and 1,700 km away, respectively—where office buildings swayed with the tremor, as well as Bangkok, Thailand and Hanoi, Vietnam. Strong aftershocks, some exceeding 6 Ms, continued to hit the area up to several months after the main shock, causing further casualties and damage. The earthquake also caused the largest number of geohazards ever recorded, including about 200,000 landslides and more than 800 quake lakes distributed over an area of 110,000 km2 (42,000 sq mi).
The 2009 Bhutan earthquake occurred on 21 September at 14:53 BTT in the eastern region of Bhutan with moment magnitude of 6.1. The epicenter was situated at 180 kilometres (110 mi) east of the capital Thimphu, in Monggar District. However, Bangladesh and northern India also felt it, with residents in Guwahati, Assam reporting cracks in buildings. The tremors were felt as far as Tibet.
The 2011 Yunnan earthquake was a 5.4 magnitude earthquake that occurred on 10 March 2011 at 12:58 CST, with its epicenter in Yingjiang County, Yunnan, People's Republic of China, near the Burmese border. A total of 26 people died and 313 were injured with 133 in serious condition. China's Xinhua reports that up to seven aftershocks, measuring up to a magnitude of 4.7, followed the initial quake, which caused a total of 127,000 people to be evacuated to nearby shelters. It joined over 1,000 other minor tremors that affected the region in the two preceding months. Following damage surveys, officials reported that 1,039 buildings were destroyed and 4,994 more were seriously damaged. The earthquake occurred one day before a much larger earthquake struck Japan that triggered a tsunami.
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The April 2015 Nepal earthquake killed 8,964 people and injured 21,952 more. It occurred at on Saturday, 25 April 2015, with a magnitude of 7.8Mw or 8.1Ms and a maximum Mercalli Intensity of X (Extreme). Its epicenter was east of Gorkha District at Barpak, Gorkha, roughly 85 km (53 mi) northwest of central Kathmandu, and its hypocenter was at a depth of approximately 8.2 km (5.1 mi). It was the worst natural disaster to strike Nepal since the 1934 Nepal–Bihar earthquake. The ground motion recorded in Kathmandu, the capital of Nepal, was of low frequency, which, along with its occurrence at an hour when many people in rural areas were working outdoors, decreased the loss of property and human lives.
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