Q. Which of the following factors can cause human induced seismicity?
1.Damming of rivers to build reservoirs.
2.The extraction of oil and gas.
3.Mining for minerals.
Select the correct answer from the codes given below;
The damming of rivers to build reservoirs, the extraction of oil and gas, and mining are some examples of human activities that could lead to ‘induced seismicity’.
For instance, to enhance energy extraction, wastewater, sand and chemicals are injected into the earth at high pressure to create fractures in the rocks. This process is called “hydraulic Fracturing”.
This process helps improve the interconnectivity of the pores in order to enhance oil and gas extraction. In some cases, fluid is injected into pores connected to the fault which may substantially increase the pore pressure within the fault to counteract the effective frictional forces. This may trigger earthquakes.