A fierce earthquake from the Nicobar Islands
could strike over Songkran, sending a tsunami crashing into the Andaman Coast,
an expert warned yesterday after finding that the 8.6-magnitude Sumatran tremor
three days ago was exceptionally deep.
"Whenever
there is a quake rooted in the [Earth's] mantle, a following quake will be
likely in the next few days," said Professor Thanawat Jaruphongsakul, a
senior seismologist at Chulalongkorn University.
Fear of
another devastating tsunami panicked Thailand and Southeast Asia on Wednesday.
An
underwater quake, with its epicentre at the Nicobar Islands, about 150
kilometres north of Aceh on Sumatra, would affect six coastal provinces of
Thailand on the Andaman Sea, especially Ranong, which lies closest to a fault
line connecting with the Nicobar Islands, he said.
The
quakes on Wednesday originated from mantlelevel crust, 20 kilometres below the
Earth's surface, which is regarded as a layer that would cause very high
magnitude tremblers.
The
quake that hit Japan in March came from a shallower layer, so it would take up
to 100,150 years for the next quake. However Wednesday's quakes, with their
epicentre at Aceh, followed just eight years after the massive one that
triggered a continent-wide tsunami that killed hundreds of thousands of people
in many countries, he said.
"Why
did Wednesday's quakes emerge just eight years afterwards? This is new to most
seismologists and geologists, who are unfamiliar with quakes with depth rooting
to the mantle layer," he said.
Seismologists
were closely watching and cautiously studying the 9.0 quake that devastated
Sendai in Japan on March 11 last year. The first tremor on March 9 was recorded
at 7.3 on the Richter scale. That one was understood by seismologists as the
main shock, but there were two aftershocks on an even greater scale at 9.0 on
March 11 that followed, he said.
The
tsunamis created on Wednesday were not powerful or harmfully high because the
quake was the horizontal dipslide type. But a mantlebased quake at an island
with active underwater volcanoes located north of the Nicobar Islands would
probably be a vertical strikeslip type, which would directly impact the six
Thai coastal provinces, and possibly deluge them with tsunamis, he added.
Professor
Michio Hashzume, a wellknown Japanese seismologist, said Wednesday's quakes
were a new type known to have started in the mantle. It was difficult to tell
whether a new quake would follow within a few days, like the Sendai quakes,
which were similar to Wednesday's quakes. Then there was a 7.3, followed by a
9.0 two days later.
If
there are quakes near the Nicobar Islands, they may cause huge collapses in the
seabed and outer crust. The seabed may rise and form new islands, he said.
Saowanee
Nimpanpayungwong
The
Nation
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