These lines are a type of Geopathic Radiation, named after Dr. Ernst Hartmann, a medical doctor, who discovered it in 1940s. These are strong electromagnetic radiations rising vertically from the Earth's surface like invisible walls. These are associated with the Earth’s magnetic field and emerge because of magnetic core of the Earth. They run north to south as well as east to west direction, forming a grid on the surface of the Earth. The distance between the lines vary from 5mt to 20 meters apart.
However, these values can vary depending on geographical location.
They affect normal vibrational frequency of our cells and can cause various health concerns, depending on the extent of exposure and our own immunity levels.