That reason were great mechanical and electromagnetic, also electrostatics resonances and interferences between bolts, plants and earth surface. A simple model of making circle in granular material by a short serie of several equivalent spark discharges is possible to see here. Only a very approximative solution, but able to explain that mechanical forces of any vertical discharge propagates in circles (it is detonating and pressure wave).
Hiyo sababu walikuwa kubwa mitambo na umeme, pia electrostatics resonances na mwingiliano Kati ya bolts mimea, na uso wa dunia. mfano rahisi ya kufanya mduara katika nyenzo punjepunje na mfululizo mfupi yanayovuja kadhaa sawa cheche Unawezekana kuona hapa . Tu sana ufumbuzi approximative, lakini uwezo wa kueleza vikosi Hiyo mitambo ya kueneza yoyote wima kutokwa katika duru (ni detonating na wimbi shinikizo).