Sri Lanka probing whether Pallekelle earthquake due to induced seismicity
ECONOMYNEXT – Sri Lanka is probing whether a minor earthquake reported near Pallekelle in central Sri Lanka was due to induced seismicity linked nearby Victoria dam or an underground limestone collapse.
Sri Lanka’s Geological Survey and Mines Bureau has dispatched two teams to investigate the quakes, the state information office said.
The Pallekelle observation unit had recorded minor earthquakes at 0706 hours on September 02 and 2032 on August 29.
The September 02 quake had been felt in Ambakote and Aluwatte areas. The August 29 quake had been felt by residents of Gurudeniya, Haragama, Anuragama and Mailapitiya.
The earthquakes were not linked to any major geological fault lines, according to seismometer data.
Researchers suspect an induced earthquake related to Victoria Reservoir or the collapse of a weak metamorphic sedimentary limestone underground.
Induced earthquakes are related to human activity such as dams, which generate stresses on the underlying geology of the area.
The area around Digana is known for Dolomite rock formations.(Colombo/Sept02/2020)