Revision as of 10:44, 7 June 2023

Cyclones

2016: "Vardah"

The Hindu, December 9, 2016

Sanjib Kumar Roy

Cyclonic storm Vardah brought normal life in a standstill in Andamans

Tourists still stranded as Havelock island remains unreachable

Havelock island remained unreachable for the second day on Thursday as the depression over the Andaman Sea intensified into cyclonic storm ‘Vardah’. Two passenger vessels of the Andaman Shipping Services, MV Rani Lakshmi and MV Kamorta, were sent to Havelock to evacuate nearly 1,100 tourists, but both the vessels had to return to Port Blair because of high waves in the sea.

Later, cargo vessel MV Badam was also sent to Havelock with supplies and medicines but had to return because of bad weather conditions. Sources said there were efforts to send Coast Guard vessels to Havelock to evacuate the tourists but bad weather put paid to this as well.

Impact

Locals extend help

Vessels of the Indian Navy, which had been sent to Havelock, were called back considering their safety at sea in the high waves.

Meanwhile, the local administration directed hotel and restaurant owners to help tourists by extending their bookings and by providing free food, whenever possible. While nearly 1,100 tourists are stranded at Havelock and 400 tourists continue to be stranded at Neil island, tourists stuck in the Port Blair area complained about poor coordination from the Tourism Department and lack of awareness about helpline centres for tourists.

They also complained of problems in extending bookings in hotels. In a video statement, Lieutenant Governor of Andaman & Nicobar Islands Jagdish Mukhi today claimed, “All tourists are safe. They could not be brought back to Port Blair only [upon] considering their safety.”

Landslides

Cyclone Vardah played havoc in many remote Islands, bringing normal life to a standstill. In the north and middle Andaman region, various islands like Diglipur, Rangat and Billyground witnessed a flood-like situation because of very heavy rainfall.

The movement of vehicles on the Andaman Trunk Road was disrupted in various places in middle and north Andaman due to flooding in low-lying areas. There were reports of landslides along the Andaman Trunk Road. The cyclone blew away roofs of several dozen houses and damaged crops in north and middle Andaman. Snapping of power cables has left many areas without power for more than two days.

The Deputy Commissioner of South Andaman, Udit Prakash Rai, said the administration would compensate those who had suffered loss because of the weather conditions.

The administration has suspended helicopter and shipping services. Some flights landed at Port Blair while many others were cancelled. The airport witnessed frayed tempers when SpiceJet cancelled its flight after passengers had boarded the aircraft.

Earthquakes

After the ’04 tsunami

Chandrima Banerjee, December 29, 2020: The Times of India

An earthquake with 10-minute-long waves is quite unusual. Many like it, in quick succession, even more so. But beneath the Andaman Sea near Nicobar, the 2004 earthquake and tsunami has set off a series of intermittent earthquake swarms that also indicate simmering volcanic activity. Scientists at the CSIR-National Institute of Oceanography in Goa on the research ship RV Sindhu Sankalp conducted a passive ocean bottom seismometer experiment for the first time in Indian waters.

They found 141 high-frequency earthquakes and swarms (bursts of quakes with a short period of time, ranging from hours to days) in areas where three faults — the Andaman Nicobar Fault, the West Andaman Fault and strands of the Great Sumatra Fault — meet.

Major swarms had occurred in the off Nicobar region in the Andaman Sea over five different periods — in January 2005, March 2014, October 2014, November 2015 and March 2019 — their study, published in Nature’s Scientific Reports this month, said.

They were really long. “The March 2014 swarm, for instance, had lasted 48 hours,” lead author Aswini KK told TOI. The swarm in January 2005 was the strongest ever recorded globally. Some earthquakes in 2014 had long period signals, like the 600-second signal they got. “This is rare and suggests the origin of the seismic waves is deep seated, located at a depth in the subsurface, about 30km below the seafloor,” corresponding author Kamesh Raju said. “At that depth, we expect magma at work.”

So while the December 2004 “tsunamigenic megathrust earthquake” itself was a reason, the active volcanism in the area has also been causing some shifts.

Does it mean an eruption might be in the offing? “The studies over the submarine volcanic chain that extends from Barren Island in the north to the onshore volcanoes of Sumatra would provide insights to answer the above question,” Raju said.

Further details

C.V.R. Murty,a… M.EERI, Durgesh C. Rai,a… M.EERI, Sudhir K. Jain,a… M.EERI, Hemant B. Kaushik,a… Goutam Mondal,a… and Suresh R. Dasha/ Performance of Structures in the Andaman and Nicobar Islands (India) during the December 2004 Great Sumatra Earthquake and Indian Ocean Tsunami/ Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India/ Earthquake Spectra, Volume 22, No. S3, pages S321–S354, June 2006; © 2006, Earthquake Engineering Research Institute/ researchgate.net

The 26 December 2004 earthquake occurred along the subduction plate boundary between the Indian plate and the Burma micro plate of the Eurasian plate. Because of the seismic activity in the region, the Indian seismic zone map Figure 2 has placed the A&N islands in seismic zone V, the most severe one in the country. The location of the main shock was 200 km SSE of the nearest island Great Nicobar Island, about 1,000 km SSE from Port Blair, and about 1,800 km SE of Chennai formerly known as Madras. The main shock and aftershocks suggest that the rupture extended over about 1,300 km of the Sunda and Andaman arc USGS 2005. The large amount of energy released during this event caused high-intensity ground shaking at several locations along the land masses adjoining this arc. However, a preliminary estimate of the maximum intensity of shaking on the MSK scale sustained in India is only about VII along the A&N islands and about V along the east coast of mainland India. The digital strongmotion instrument installed at Port Blair by the India Meteorological Department failed to record the main event. The intensity of ground shaking in Port Blair was placed at VI–VII on the MSK scale Jain et al. 2005. For shaking intensity VII, the average peak ground acceleration is generally about 0.1 g. Analysis of a collapsed RC bicycle and motor scooter shelter also indicates that the peak ground acceleration in Port Blair during the earthquake was about 0.1 g Kaushik and Jain 2006.

The distribution of tsunami-induced damage along the A&N islands followed the general trend of more damage in the islands closer to the epicenter and less damage in those farther away. Persons interviewed at Port Blair recall that the water receded before the first wave, and the third wave came with the greatest height and caused maximum devastation. However, persons at locations far south of Port Blair, namely at Hut Bay, Malacca, and Campbell Bay, mention that the water level rose by about 1–2 m from the normal sea level and remained there before the giant wave lashed the entire built environment. Eyewitnesses recall that the tallest of the giant waves was about 5 m high at Campbell Bay in Great Nicobar Island, about 8 m at Malacca in Car Nicobar Island and at Hut Bay in Little Andaman Island, and about 4.5 m at Port Blair in South Andaman Island; these wave heights were also corroborated by field measurements by various agencies DST 2005 Figure 3. The partial shielding of the coastline at Campbell Bay and significant shielding of Port Blair and Campbell Bay by the steep mountainous outcrops from the direct tsunami waves originating from Sumatra may have contributed to the reduced wave heights at these locations. However, the open terrain along the eastern coast of the islands at Malacca and Hut Bay is seen as a reason for the large height of the tsunami waves.

Tsunami: 2004

Briefly

The Times of India

Dec 31 2014

Nicobar islands: some facts

Shamsher Bahadur Singh Deol

With most settlements located around jetties, the waves left the islands devastated. The coconut was the only source of food and water to those stranded. It was the self-belief of the indigenous people that enabled their survival and recovery

Before the tsunami of 2004, Nicobar islands had a population of 50,000, with almost all Nicobari tribals bearing allegiance to the Church of North India. For this sparsely populated area, the 3,500 lives lost in the tsunami amounted to 7% of the population. In 2004, I was posted as inspector general of police of the Andaman and Nicobar Islands. The epicentre was only 150km from Indira Point and the intensity of the earthquake was 9.1 on the Richter Scale; compare that to the Latur quake, which registered at a mere 6.4. The Richter Scale is not linear but exponential, the intensity multiplying 33 times for readings between 8 and 9, and quakes cause disturbances in the ocean that can reach a speed of up to 450km an hour. On the surface of the water, there is barely a ripple, 20 cm to 70 cm high, imperceptible to boats and fishermen at sea, but its awesome power erupts on barriers it encounters.

An unhealthy dose of what is termed as the `Island Psyche' inflicts the inhabitants of the Andamans.This is a combination of isolation, hopelessness, uncertainty and boredom. Throw in depression, mental illness and alcoholism and the psyche becomes a debilitation.

This psyche is what contributed to the concentration of people and buildings around the jetty of each island. At least periodically, this enabled the inhabitants to feel connected to the outside world, if only to Port Blair, to see who was coming or leaving on the erratic steamer service, to see if vegetables, cooking gas or milk powder was now available. Constructed around the jetty were the generator plants, water supply systems, schools, dispensaries, revenue offices, police stations, markets, banks. It was as `downtown' as it could get. In less than 20 seconds, the third wave of the tsunami wiped out all of it, along with thousands of people.

Along with the disappearance of police weaponry, wireless equipment, revenue records and vehicles, survivors were left without medicines, educational certificates, driving licences, land titles, kitchen utensils, spectacles, and other necessities too numerous to list. It was as if life had to begin anew.

The tsunami stripped the islands off these laboriously-built jetties, boats, communication links, intraisland roads and public services.Four thousand hectares of land was permanently submerged and some islands tilted from one side to the other. One of the islands, Trinkat, is today split into three separate islands.

Only around 300 rotting and bloated bodies were located in the 10 days after the event. We were required to photograph each of them but this formality had to be abandoned as no facial features were discernible. Only one accurate identification was achieved -that of a policeman in uniform, complete with name tag. To prevent epidemics, the police had to carry out cremations on the spot. A battered vehicle was located, the petrol siphoned off and sprinkled on the body, which was then covered with plastic chairs, pieces of cloth and dry wood before a fire was ignited.

In the three non-tribal islands, Campbell Bay, Kachal and Hut Bay, we were vociferously accosted with impossible demands, hostile sloganshouting and breast-beating. Even at Port Blair on December 26, I had to unsheath my revolver to control strident, almost violent tourists from the mainland who had surrounded the car of the Lieutenant Governor. To blame God or nature for the tsunami gives us nothing to rail at; we want a personification of our oppressor to vent our hate upon.

In sharp contrast, the Nicobarese were, without exception, dignified and disciplined. When we first visited their village, the survivors would be sitting neatly in rows on the ground. Women would cry with muted sobs, but no man would break down. The captain of the village was the only person to speak on their behalf, handing over a list of the two or three dead and the more than 200 missing. Nicobarese bestow names on their children with complete freedom. The list of the unfortunates included Alexander the Great, Sehwag, Cassius Clay, Ravi Shastri, Cleopatra, Vivian Richards, Josephine, Maradona, Sachin Tendulkar, Pele and Napoleon Bonaparte. So many dreams shattered.

Not used to dealing with money, they were bewildered by the vast amounts of compensation given to them. Upscale cars and motorcycles were purchased without consideration of maintenance and fuel costs. Money was loaned to friends, donated to clan members and invested with deceitful merchants. In the tribal areas where alcohol is forbidden by law, a bottle of rum was being sold for Rs2,000. Like the tsunami waves, the money came and went.

The media showed a dogged interest in only one aspect -the casualty figures. On the fifth day I went out on a limb to say that according to what I had seen and from reports received, approximately 5,000 citizens were dead, missing or injured. The home ministry, right up to the very top, was livid! Who did I think I was? On what basis was I giving out such wild and exaggerated figures? How many bodies had the police located? The answer at that stage was seven. I was therefore to retract my statement forthwith and correctly state that only seven persons had died and report compliance.

By this time, I was also livid. Who else but the inspector general of the Andaman and Nicobar police was most qualified to assess the numbers? I suggested that the ministry should overrule me and announce their own estimates. That was the end of that. Eventually the government started to pay some attention to our islands.

However much the government lauded its own relief efforts subsequently , it is the humble coconut that supplied food and water to those stranded till help could reach them. More crucially the self-reliance, and the self-belief, of the Nicobari people was the greatest factor in their survival and recovery.

See also

Andaman And Nicobar Islands

Andaman And Nicobar Islands: Fauna

Andaman And Nicobar Islands: Flora

Andaman And Nicobar Islands: Natural calamities

Andaman and Nicobar Islands: Parliamentary elections

Andaman and Nicobar Islands: Tribes

Census India 1931: The Population Problem in Andaman and Nicobar Islands