Apr 11

Tsunami alert withdrawn from Indian Ocean

HAWAII: According to Pacific Tsunami Warning Centre (PTWC), sea level readings now indicate that the threat has diminished or is over for most areas and therefore the tsunami alert issued by the center, earlier, now stands cancelled.Tsunami  center

The PTWC, in its latest bulletin has withdrawn its Tsunami warning issued after the massive earthquake off western coast of North Sumatra with a magnitude of 8.7 on Richter scale in the afternoon (IST).

“A significant Tsunami was generated by this earthquake. However…sea level readings now indicate that the threat has diminished or is over for most areas. Therefore thetsunami watch issued by this center is now cancelled,” PTWC said in the release. Even Indonesia’s disaster mitigation agency has said there is no detection of low tide that would indicate tsunami in Aceh.

The PTWC issued a tsunami warning across 28 countries, including Indonesia, India, Sri Lanka and Bangladesh following a a massive earthquake off western coast of North Sumatra with a magnitude of 8.7 on Richter scale.

For any affected areas – when no major waves have occurred for at least two hours after the estimated arrival time or damaging waves have not occurred for at least two hours then local authorities can assume the threat is passed. Danger to boats and coastal structures can continue for several hours due to rapid currents. As local conditions can cause a wide variation inTsunami wave action the all clear determination must be made by local authorities, the PTWC said.

Bruce Presgrave of the US Geological Survey (USGS), told the BBC that the nature of this quake made it less likely a tsunami would be generated, as the earth had moved horizontally, rather than vertically, therefore had not displaced large volumes of water. “We can’t rule out the possibility, but horizontal motion is less likely to produce a destructivetsunami,” he said.

In a bulletin, the Centre issued an Indian Ocean wide Tsunami watch alert effective for Indonesia, India, Sri Lanka, Australia, Myanmar, Thailand, Maldives, United Kingdom, Malaysia, Mauritius, Reunion, Seychelles, Pakistan, Somalia, Oman, Madagascar, Iran, UAE, Yemen, Comores, Bangladesh, Tanzania, Mozambique, Kenya, Crozet Islands, Kerguelen Islands, South Africa and Singapore.