Geologists allay fears over tremors, say Deccan Plateau is protected zone
On Saturday, the quake measured 4.4 on the Richter scale in Vijayapura bordering Maharashtra, and there was one other tremor of 1.8 this morning in south Karnataka.
Kodagu reported a number of incidents of landslide and in a single incident three days in the past, three labourers had been killed.
Incidentally, the seismic actions turned extra seen quickly after a serious earthquake in Afghanistan, which killed a number of individuals and left many injured.
But, the geologists in Karnataka had been unanimous in saying there was no must panic because the Deccan Plateau is a protected zone seismically.
They had been additionally of the opinion that these tremors had been important because the stress attributable to the disturbance is popping out within the type of gentle tremor.
Earthquake is just not a regional phenomenon. The Indian subcontinent is all the time shifting. Each 12 months, the subcontinent is shifting 0.5 centimetre. So, there would all the time be some inner disturbance, Dr Lakshmamma, Joint Director within the Department of Mines and Geology, informed PTI.
“What we had studied in school that the Deccan Plateau is safe is true even now, but there are some internal disturbance at the crust. So the pressure caused due to disturbance should come out, otherwise, if the pressure remains forever, it can cause major disturbance,” she mentioned.
“These disturbances coming out through small tremors is good. We are still in the safe zone. We will be safe even if there is an earthquake of 5 on the Richter scale,” the geologist mentioned.
According to her, the river valleys themselves are the fault zones.
The valley area of main rivers are the lineaments, that are fault zones the place weak areas and fissures are fashioned in laborious rock terrain, Lakshmamma mentioned.
Whenever there are rains, water percolates into the fault zones and will get crammed up in empty locations, the geologist added.
Another geologist Professor Renuka Prasad additionally mentioned these are too minor a phenomenon to fret.
“Earthquakes have been happening across the world and at many places, but we are coming to know about the tremors because we are in an information era. Further, more devices have been installed at various places to study the seismic activities, due to which we get information in real time and we panic,” he mentioned.
Hydro-geologist Dr Kumar C, who’s a professor on the Nrupathunga University, identified that the depth of seismic actions was rising from two on Richter scale to 4.4 on Saturday in Vijayapura in north Karnataka.
“But, there is no need to panic as of now but these seismic activities give us some indications that we should be on the alert and avoid using substandard materials for constructing buildings,” he mentioned.
Meanwhile, sources within the Mines and Geology Department mentioned a workforce of geologists from the State authorities, Geological Survey of India, and Suratkal- primarily based National Institute of Technology (NIT), visited Kodagu to review the phenomenon.
Since June 26, there have been seven to eight incidents of tremors in and round Madikeri in Kodagu district as a result of which the workforce was dispatched there, they mentioned including that the research revealed that Kodagu falls underneath zone-3 of seismograph.
“We got to know that some oscillation happened. Kodagu is a hard rock terrain made up of charnockite,” a supply mentioned.
To research why there was tremor regardless of being sitting on a tough rock, the workforce went into the historical past of the earthquake. The workforce discovered that the Geology Department of the Mysuru University and the GSI had additionally studied the kind of earth present in Kodagu.
“We came across that there is a shear zone or the weak zone. One side there is Kodagu block, and on the other is the Western Ghat block. Both the blocks are becoming divergent. They are moving into each other. That’s why we see some disturbance, some discontinuity happening,” he mentioned.
According to him, the shear zone is 100-km lengthy with 30-50 km width, which runs from Kasargod in Kerala to Palakkad.
Further, the Cauvery river valley itself is a fault zone making it susceptible to earthquakes however they aren’t the most important disturbance space, he added.
Regarding tremors in north Karnataka, he mentioned the Bhima river and Krishna river are the most important fault zones as a result of which the tremors happen.