ramanan50

Why No Tsunami , Less Damage Now

In natural disasters on April 12, 2012 at 08:10

A picture of the 2004 tsunami in Ao Nang, Krab...

A picture of the 2004 tsunami in Ao Nang, Krabi Province, Thailand. Français : Image montrant le raz-de-marée de 2004 à Ao Nang, en Thaïlande. Italiano: Una fotografia del maremoto dell'Oceano Indiano ad Ao Nang, in Tailandia. Español: Imagen del terremoto del Océano Índico de 2004 en Ao Nang, Tailandia. മലയാളം: 2004-ൽ ഇന്ത്യൻ മഹാസമുദ്രത്തിൽ ഉണ്ടായ സുനാമി, തായ്‌ലാന്റിലെ ആവോ നാങിൽ നിന്നുള്ള ചിത്രം. Myanmasa: ဆူနာမီ (Photo credit: Wikipedia)

The Earthquake in 2004 triggered Tsunami of great proportions which caused immense damage to property and people was a lighter one than the one that occurred on 11 April 2012.

Though it was feared initially that this will cause Tsunami of great proportions which made the ptwc issue Tsunami alert for as many as 28 countries,the alert was withdrawn.

Barring a small Tsunami in Thailand(see by blog on this), no major Tsunami has been reported nor very serious damage done to properties.

Why?

Location of the earthquake.

 

“The first temblor, a magnitude 8.6 quake, struck at 2:38 p.m. local time, along a segment of a fault on the sea floor some 269 miles southwest of the coastal city of Banda Aceh, capital of Aceh province. A second, 8.2 magnitude quake struck two hours later roughly 120 miles south of the first quake’s epicenter.

Both quakes occurred at relatively shallow depths – 14 miles and 10 miles – beneath the sea floor, according to data gathered by the US Geological Survey‘s National Earthquake Information Center in Golden, Colo.

So far, the quakes appear to have done little damage and caused no fatalities, although people felt the shaking as far away as the east coast of India. In Banda Aceh, many residents streamed into the streets when the shaking began, according to press reports from the city.

Memories of the disastrous December 2004 earthquake and tsunami remain fresh. The event left 230,000 dead throughout the Indian Ocean basin as the tsunami in some locations reached heights of up to 90 feet.

Though both of Wednesday’s large quakes join the magnitude 9.1 event in 2004 event as “great” earthquakes – the strongest of six categories – the initial temblor Wednesday reportedly pushed only a 30-inch-high surge of water onto Indonesia‘s west coast.

In addition, the 2004 event released nearly six times as much energy as the first quake that struck on Wednesday and some 22 times more energy than the second.

The difference? Location, suggests Amy Vaughan, a geophysicist with the National Earthquake Information Center.

The 2004 rupture occurred along the northern reaches of a subduction zone that hugs the west coast of Indonesia and defines the arc of Indonesia’s islands.

The quake occurred in a section of the zone where a vast patch of crust known as the Indian plate is sliding beneath the much smaller Burma plate. Quakes along such subduction zones tend to generate the planet’s most violent temblors because the surface areas sliding past each other are large.

Researchers estimate that the patch of the subduction zone affected in the 2004 quake covered an area roughly the size of California. The amount of slip along the length of this patch was 50 feet.

http://www.csmonitor.com/Science/2012/0411/Indonesia-earthquake-Why-no-tsunami-this-time

  1. I never for a moment thought the comment was directed at me..
    My views were an expression of my anguish at our inability to make use of Science to prevent Disaster.
    We can not blame the Scientists..
    By its definition science is nothing more than an aggregate of Facts that are verifiable, under certain constant conditions,which it is assumed shall produce the same results repeatedly..
    Unfortunately, nature need not behave as we expect it to behave at all times.
    We might not have discovered some facts that control event..
    Again, Cause and Effect are not causally linked..
    One is not the cause for another.
    Events are conjoined.and not causally related..
    The best we can do is to have the information available and prepare ourselves .
    Science is an indicator, that’s all.
    However we must explore th other reasons as indicated by you.

    Like this

  2. Good information. But I’ve two questions:

    1. Why has not this voice raised yesterday when everyone went panic with fear of tsunami? you could have screamed “shut up! this time no tsunami”

    2. Had tsunami been there yesterday anyhow, would you have dared to shout “something has terribally gone wrong. by theory, tsunami shouldn’t have been there”

    Like this

    • 1.Science, as I know of it, is inexact more so Seismology.
      If you haven’t noticed my blogs of yesterday , the intensity of the Eartquake was mentioned as 8.7 in one place and 8.9 at another.
      Reason-different Centres gave different values.
      That’s accuracy for you from these Centres.Therefore, I waited.
      More importantly, it is better to be called a ‘fool’ than to regret for having provided an information that would have caused Deaths, were the information provided in the article to have been proved incorrect.
      Better to err on the side of Caution.
      As for as far as these ‘alerts’ and ‘Warnings’ are concerned I take them to indicate of worse things to come and be prepared.

      Like this

      • Hello Ramani, Sorry I should have menioned my reply was not to you but it was questions to Amy Vaughan, a geophysicist with the National Earthquake Information Center. Somehow I could not have posted to original news given at end of this blog so posted here but yes as you said rightly, science is history it always tries to go in reasoning as to why it could have happened. But dont know why is it still least useful to predict something. Why shouldnt we question ourselves was there something else caused tsunami in 2004 and the vertical movements of plates was just reason given by science?

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