Records of the Central Seismological Observatory here showed increasing seismic activity in the region. A total 34 quakes of light and moderate intensity were felt in the region in 2009. The area witnessed 26 earthquakes each in 2008 and 2007, while it was 23 in 2006, the data showed.
On February 4 this year, a quake of 6.4 magnitude with its epicentre in the Indo-Myanmar border in Manipur shook the region. An earthquake of similar intensity (6.8) had rocked the northeast on August 6, 1988.
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