Taipei - A Taiwan scientist has made breakthrough in
earthquake early warnings, allowing the public be warned 10 to 30
seconds before a major quake causes destruction, a newspaper said
Monday.
The breakthrough was achieved by Wu Yi-min, associate professor in
the Geophysics Department of the National Taiwan University. It can
give the public more time to seek safety, as currently the quickest
alert Taiwan's Seismological Observation Centre can give is 30 second
after a quake has struck, the China Times said.
According to Wu, after an earthquake has occurred, it sends out s-
waves and p-waves. S-waves are the less destructive horizontal waves,
while p-waves are devastating vertical waves.
As s-waves travel 1.73 times faster than p-waves, Wu has worked
out the correlation between the p-waves and the magnitude of the
quake, which means that by analysing the characteristics of p-waves,
he can gauge the destructive force of the quake.
Wu tested his method at the South California earthquake monitoring
network, the paper said.
The test showed that after an earthquake, four to six monitoring
stations recorded features of the p-wave within seven seconds after
the quake had struck. Adding the time of computer transmission, a
warning could be sent out 10 seconds before a quake starts to cause
damage.
The China Times said that Wu's method can prevent or cut property
damage or loss of life because 10 is enough for someone to switch off
a gas stove, for a bullet train to slow down or for a nuclear power
plant's reactors to be shut.
Taiwan's Seismological Observation Centre can measure an
earthquakes' magnitude no sooner than 18 seconds after the quake's
begins. Measuring the magnitude and sending out the warning takes at
least 30 seconds.
Wu plans to invent a portable earthquake early-warning gadget so
that people can receive early warnings from the Seismological
Observation Centre after a strong quake has struck.
According to the China Times, Wu has submitted his findings to the
Geophysical Research Letters, and his research has attracted
attention from many countries including Japan, South Korea and from
the Pacific Tsunami Warning Centre.
Taiwan's Seismological Observation Centre said it will not adopt
Wu's method until the accuracy of his earthquake early-warning can be
proven, the paper said.
Taiwan sits on the circum-Pacific seismic belt and experiences
hundreds of earthquakes each year, but most are mild tremors.
On September 21, 1999, an earthquake measuring 7.3 on the Richter
scale struck in Taichung Country, central Taiwan, killing 2,400
people and injuring more than 10,000 people.
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