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April 2015 Nepal earthquake

The April 2015 Nepal earthquake killed 8,962 people and injured 21,952 across the countries of Nepal, India, China and Bangladesh. It occurred at 11:56 Nepal Standard Time on Saturday 25 April 2015, with a magnitude of Mw 7.8–7.9 or Ms 8.1 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–India 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 human lives.

Earthquake
The earthquake occurred on 25 April 2015 at 11:56 am NPT (06:11:25 UTC) at a depth of approximately (which is considered shallow and therefore more damaging than quakes that originate deeper in the ground), with its epicentre approximately southeast of Lamjung, Nepal, lasting approximately 50 seconds. The earthquake was initially reported as 7.5 by the United States Geological Survey (USGS) before it was quickly upgraded to 7.8, while the Global Centroid Moment Tensor (GCMT) reported a magnitude of 7.9. According to the USGS, the earthquake was caused by a sudden short sharp upthrust along the convergent boundary where the Indian plate, carrying India, is slowly diving underneath the Eurasian plate, carrying much of Europe and Asia. The risk of a large earthquake was well known beforehand. In 2013, in an interview with seismologist Vinod Kumar Gaur, The Hindu quoted him as saying, "Calculations show that there is sufficient accumulated energy [in the Main Frontal Thrust], now to produce an 8-magnitude earthquake. I cannot say when. It may not happen tomorrow, but it could possibly happen sometime this century, or wait longer to produce a much larger one." According to Brian Tucker, founder of a nonprofit organization devoted to reducing casualties from natural disasters, some government officials had expressed confidence that such an earthquake would not occur again. Tucker recounted a conversation he had with a government official in the 1990s who said, "We don't have to worry about earthquakes anymore, because we already had an earthquake." The previous earthquake to which he referred occurred in 1934. In fact, the 600-km-long Central Himalayan Gap hadn't ruptured since 1505. ==Geology==
Geology
Nepal lies towards the southern limit of the diffuse collisional boundary where the Indian plate underthrusts the Eurasian plate, occupying the central sector of the Himalayan arc, nearly one-third of the long Himalayas. Geologically, the Nepal Himalayas are subdivided into five tectonic zones from north to south, east to west, and almost parallel to sub-parallel. These five distinct morpho-geotectonic zones are: (1) Terai Plain; (2) Sub Himalaya (Shivalik Range); (3) Lesser Himalaya (Mahabharat Range and mid valleys); (4) Higher Himalaya; and (5) Inner Himalaya (Tibetan Tethys). Each of these zones is clearly identified by its morphological, geological, and tectonic features. The earthquake's effects were amplified in Kathmandu as it sits on the Kathmandu Basin, which contains up to of sedimentary rocks, representing the infilling of a lake. Based on a study published in 2014, of the Main Frontal Thrust, on average a great earthquake occurs every 750 ± 140 and 870 ± 350 years in the east Nepal region. A study from 2015 found a 700-year delay between earthquakes in the region. The study also suggests that because of tectonic stress buildup, the 1934 earthquake and the 2015 quake are connected, following a historic earthquake pattern. A 2016 study on historical great (M ≥ 8) earthquake pairs and cycles found that associated great earthquakes are likely to occur in the West China region through the 2020s. Intensity According to the USGS website, the maximum intensity was VIII (Severe), however certain reports state an intensity of X (Extreme) or higher. Damage was extensive in northern Bihar and minor damage was also reported from parts of Odisha. The intensity was IV (Light) in Dhaka, Bangladesh. Tremors were felt in Pakistan and Bhutan. The aftershock caused fresh avalanches on Mount Everest and was felt in many places in northern India including Kolkata, Siliguri, Jalpaiguri, and Assam. The aftershock caused a landslide on the Koshi Highway, which blocked the section of the road between Bhedetar and Mulghat. A model of GeoGateway, based on a United States Geological Survey mechanism of a near-horizontal fault as well as the location of aftershocks showed that the fault had an 11° dip towards the north, striking at 295°, was wide, long, and had a dip slip of . The USGS says the aftershock registered at a shallow depth of . Tremors were also felt in northern parts of India including Bihar, Uttar Pradesh, West Bengal and other North-Indian States. At least 153 people died in Nepal as a result of the aftershock and about 2,500 were injured. 62 others died in India, two in Bangladesh, and one in China. ==Aftermath==
Aftermath
Disastrous events in very poor and politically paralyzed nations such as Nepal often become a long drawn out chain of events, in that one disaster feeds into another for years or even decades on end. The aftereffects of the earthquake had subsequent effects on a myriad of things: human trafficking, labour cost and availability, rental and property cost burdens, urbanization, private and public debt burdens, mental health, politics, tourism, disease, and damage to the healthcare system. A survey some 30 months later found only 12% of the reconstruction money had been distributed, and those without land were locked out of financial support, exacerbating the social divide and feeding marginalization. More direct effects Some disasters that came with the monsoon season were suspected to be related to the earthquake. There was a landslip on 11 June, killing 53 people. Meanwhile, a glacial lake had burst in the particularly hard-hit Solukhumbhu district. Whether or not the quake contributed to such events is often unknown and unresearched, but it is certainly possible. Casualties Nepal The earthquake killed at least 8,857 people in Nepal and injured nearly three times as many. The rural death toll may have been minimized by the fact that most villagers were outdoors working when the quake hit. As of 15 May, 6,271 people, including 1,700 from the 12 May aftershock, were still receiving treatment for their injuries. Nearly 3.5 million people were left homeless, causing around 2.6 million internal displacements. The Himalayan Times reported that as many as 20,000 foreign nationals may have been visiting Nepal at the time of the earthquake, although reports of foreign deaths were relatively low. India A total of 78 deaths were reported in India – including 58 in Bihar, 16 in Uttar Pradesh, 3 in West Bengal and 1 in Rajasthan. with at least 120 others injured or missing. and the village of Langtang. The avalanche was estimated to have been two to three kilometres wide. Ghodatabela was an area popular on the Langtang trekking route. The village of Langtang was destroyed by the avalanche. Smaller settlements on the outskirts of Langtang were buried during the earthquake, such as Chyamki, Thangsyap, and Mundu. Twelve locals and two foreigners were believed to have survived. Smaller landslides occurred in the Trishuli River Valley with reports of significant damage at Mailung, Simle, and Archale. On 4 May it was announced that 52 bodies had been found in the Langtang area, of which seven were bodies of foreigners. According to geological models, the frequency and intensity of future landslides in the Langtang Valley is due to increase in the coming decades. This is attributable directly to the effect of the earthquake, which caused widespread fracturing in the grounds of the Langtang area. Damage Square Thousands of houses were destroyed across many districts of the country, with entire villages flattened, especially those near the epicenter. The Tribhuvan International Airport serving Kathmandu was closed immediately after the earthquake, but was re-opened later in the day for relief operations and, later, for some commercial flights. It subsequently shut down operations sporadically due to aftershocks, and on 3 May was closed temporarily to the largest planes for fear of runway damage. During strong aftershocks, the airport opened all boarding-lounge exit doors onto the tarmac, allowing people who were waiting post security and immigration to flee to the open spaces of the runway tarmac. Many remained outside as planes were delayed and the airport swelled to capacity. The airport facilities suffered damage and there was no running water or operating toilets in the airport lounges. Few airport workers were at their posts; most were killed in the earthquake or had to deal with its aftereffects. Flights resumed from Pokhara, to the west of the epicentre, on 27 April. before the earthquake Several of the churches in the Kathmandu valley were destroyed. As Saturday is the principal day of Christian worship in Nepal, 500 people were reported to have died in the collapses. Several temples on Kathmandu Durbar Square, a UNESCO World Heritage Site, collapsed, Manakamana Temple in Gorkha, previously damaged in an earlier quake, tilted several inches further. The northern side of Janaki Mandir in Janakpur was reported to have been damaged. Several temples, including Kasthamandap, Panchtale temple, the top levels of the nine-story Basantapur Durbar, the Dasa Avtar temple and two shrines located behind the Shiva Parvati temple were demolished by the quake. Some other monuments including the Taleju Bhawani Temple partially collapsed. The top of the Jaya Bageshwari Temple in Gaushala and some parts of the Pashupatinath Temple, Swyambhunath, Boudhanath Stupa, Ratna Mandir, inside Rani Pokhari, and Durbar High School have been destroyed. In Patan, the Char Narayan Mandir, the statue of Yog Narendra Malla, a pati inside Patan Durbar Square, the Taleju Temple, the Hari Shankar, Uma Maheshwar Temple and the Machhindranath Temple in Bungamati were destroyed. In Tripureshwar, the Kal Mochan Ghat, a temple inspired by Mughal architecture, was completely destroyed and the nearby Tripura Sundari also suffered significant damage. In Bhaktapur, several monuments, including the Phasi Deva temple, the Chardham temple and the 17th century Vatsala Durga Temple were fully or partially destroyed. Nepal, with a total Gross Domestic Product of US$19.921 billion (according to a 2012 estimate), is one of Asia's poorest countries, and has little ability to fund a major reconstruction effort on its own. Even before the quake, the Asian Development Bank estimated that it would need to spend about four times more than it currently does annually on infrastructure through to 2020 to attract investment. More recent studies estimate the damage from the earthquake to be closer to US$10 billion (which would be around 50% of Nepals GDP at the time). Social effects It was reported that the survivors were preyed upon by human traffickers involved in the supply of girls and women to the brothels of South Asia. These traffickers took advantage of the chaos that resulted from the aftermath of the earthquake. The most affected were women from poor communities who lost their homes. In response to the unsafe conditions of the temporary campsites, international organizations implemented Safety Committees which were provided cash grants for necessities like additional toilets and bathrooms. Most affected Single women had very little access to relief, according to a report by the Inter-party Women's Alliance (IPWA). The report also found that violence and rapes against women and minors have increased after the earthquake. Additionally, the earthquake has significantly affected certain groups of people. Tibeto-Burman peoples were hardest hit as they tend to inhabit the higher slopes of mountains as opposed to the central valleys and are less educated and connected. All of these factors make them harder to access. According to a government survey, malnutrition in children has worsened considerably some 3 months after the quake, with the most undernourished being Tamang and Chepang peoples. Before the quake, 41 percent of children under five were stunted, 29 percent were underweight and 11 percent were emaciated, according to the World Food Programme. The mental and emotional impact of an earthquake is the other invisible disaster. Medical Doctors from India, Ramachandra Kamath, Edmond Fernandes and Prakash Narayan stated that elderly care in disaster was more important than women and child focused one for Nepal earthquake and absence of military support for medical aid providers impacted relief work. ==Rescue and relief==
Rescue and relief
About 90% of soldiers from the Nepalese Army were sent to the stricken areas in the aftermath of the earthquake under Operation Sankat Mochan, with volunteers mobilized from other parts of the country. Rainfall and aftershocks were factors complicating the rescue efforts, with potential secondary effects like additional landslides and further building collapses being concerns. Impassable roads and damaged communications infrastructure posed substantial challenges to rescue efforts. Survivors were found up to a week after the earthquake. As of 1 May international aid agencies like Médecins Sans Frontières and the Red Cross were able to start medically evacuating the critically wounded by helicopter from outlying areas, initially cut-off from the capital city, Kathmandu, There was concern about epidemics due to the shortage of clean water, the makeshift nature of living conditions and the lack of toilets. Emergency workers were able to identify four men who had been trapped in rubble, and rescue them, using advanced heartbeat detection. The four men were trapped in up to ten feet of rubble in the village of Chautara, north of Kathmandu. An international team of rescuers from several countries using FINDER devices found two sets of men under two different collapsed buildings. Volunteers used crisis mapping to help plan emergency aid work. Information was mapped from data input from social media, satellite pictures and drones of passable roads, collapsed houses, stranded, shelterless and starving people, who needed help, and from messages and contact details of people willing to help. On-site volunteers verified these mapping details wherever they could to reduce errors. The technologies used by Kathmandu Living Labs were built on top of existing open source solutions which allowed them to work in a fast and cost effective manner. Digital mappers, through the Kathmandu Living Labs, were already charting the densely populated Kathmandu Valley, and then focused on earthquake relief. "They were doing an inventory in the poorer communities where they didn't have a very good sense of the quality of buildings," says Cowan, whose students helped add Kathmandu's buildings and roads to OpenStreetMap. First responders, from Nepalese citizens to the Red Cross, the Nepal army and the United Nations used this data. The Nepal earthquake crisis mapping utilized experience gained and lessons learned about planning emergency aid work from earthquakes in Haiti and Indonesia. India pledged to donate $1 billion in cash and materials to Nepal. India's External Affairs Minister Sushma Swaraj said "I am happy to announce Government of India's pledge for Nepal's post-earthquake reconstruction of Nepali Rupees 10,000 crores, equivalent to one billion US dollars, one fourth of it as Grant." The International Conference on Nepal's Reconstruction has been organised by the Nepalese government to raise funds for rebuilding the country. Reports are also coming in of sub-standard relief materials and inedible food being sent to Nepal by many of the foreign aid agencies. A United States Marine Corps helicopter crashed on 12 May while involved in delivering relief supplies. The Bell UH-1Y Venom crashed at Charikot, roughly 45 miles (72 kilometres) east of Kathmandu. Two Nepalese soldiers and six American Marines died in the crash. Need-fulfillment application, Getmii, launched a special pilot version in partnership with the Red Cross to double daily blood donors at the Kathmandu donation center using the app. Imaging technologies such as satellites and smartphones, were instrumental to relief efforts in Nepal. GLIMS, group of volunteer scientists from nine nations, were able to provide rapid, systematic mapping of the damaged area, allowing the investigation of earthquake-induced geo-hazard processes that provided information to relief and recovery officials on the same timeframe as those operations were occurring. Charities and Crowdfunding platforms received over $230 million in donations from support groups. The money was used to provide medical supplies, for reconstruction of damaged buildings including schools and hospitals, and building orphanages for the victims among other things. ==Repair and reconstruction==
Repair and reconstruction
Monuments UNESCO and the Ministry of Culture began strengthening damaged monuments in danger of collapsing before the monsoon season. Subsequent restoration of collapsed structures, including historic houses is planned. Architectural drawings exist that provide plans for reconstruction. According to UNESCO, more than 30 monuments in the Kathmandu Valley collapsed in the quakes, and another 120 incurred partial damage. Repair estimates are $160 million to restore 1,000 damaged and destroyed monasteries, temples, historic houses, and shrines across the country. The destruction is concentrated in the Kathmandu Valley. UNESCO designated seven groups of multi-ethnic monuments clustered in the valley as a single World Heritage Site, including Swayambhu, the three squares namely Durbar square of Kathmandu, Patan Durbar Square, and Bhaktapur Durbar Square, and the Hindu temples of Pashupatinath and Changu Narayan. Out of them only three were damaged in the quakes—three Durbar squares, the temple of Changu Narayan, and the 1655 temple in Sankhu. Drones fly above cultural heritage sites to provide 3D images of the damage to use for planning repairs. Nepal Rural Housing Reconstruction Program After an international donors conference held in Kathmandu on 25 June 2015 a multi donor trust fund of US$4.4 billion was established to aid the reconstruction of affected housing in 14 districts of Nepal. This covered 66 per cent of the country's total recovery and reconstruction needs of US$6.7 billion. The data collection for the program was done digitally using tablets and resulted in collection of over 10 TB of data. The data was openly released to the public by the National Planning Commission and is available for download on their website. ==International aid==
International aid
A total of $3bn was pledged by donors to help rebuild Nepal. UNICEF said close to 1.7 million children had been driven out into the open, and were in desperate need of drinking water, psychological counsel, temporary shelters, sanitation and protection from disease outbreak. It distributed water, tents, hygiene kits, water purification tablets and buckets. Numerous other organizations provided similar support. India was the first to respond within hours, being Nepal's immediate neighbour, with Operation Maitri which provided rescue and relief by its armed forces. It also evacuated its own and other countries' stranded nationals. India has been the largest aid donor to Nepal following the earthquake with a billion dollar support apart from other non-monetary reliefs extended. On 26 April 2015, international aid agencies and governments mobilized rescue workers and aid for the earthquake. They faced challenges in both getting assistance to Nepal and ferrying people to remote areas as the country had few helicopters. Relief efforts were also hampered by Nepalese government insistence on routing aid through the Prime Minister's Disaster Relief Fund and its National Emergency Operation Center. After concerns were raised, it was clarified that "Non-profits" or NGOs already in the country could continue receiving aid directly and bypass the official fund. Aid mismatch and supply of "leftovers" by donors, aid diversion in Nepal, mistrust over control of the distribution of funds and supplies, congestion and customs delays at Kathmandu's airport and border check posts were also reported. On 3 May 2015, restrictions were placed on heavy aircraft flying in aid supplies after new cracks were noticed on the runway at the Tribhuvan International Airport, Nepal's only airport able to handle larger jet aircraft. The list below gives a break-up of pledged donations, by each nation, along with aid in kind, delivered immediately. ==See also==
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