埋藏在地下的煤层,其浅部或露头处因接触空气发生氧化反应使煤的温度升高而自燃,呈现烟雾升腾、炎气灼人的景象。在古代,人们直观地称它“火山”。 这种因煤层自燃而形成的“火山”,我国许多地方都曾发生过,历代文献中记载颇多。早期的记载见于《汉书·成帝记》:“河平四年,山阳火生石中。”“山阳”,汉时县名,故城在今河南修武县西南三十五 Buried underground coal seam, its shallow or outcrop due to contact with air oxidation reaction so that the temperature of coal and spontaneous combustion, showing smoke rising, burning gas scene. In ancient times, people intuitively called it “volcano.” This kind of “volcano” formed by spontaneous combustion of coal seam has occurred in many parts of our country, and many records in the literature of various ages have been recorded. Early records found in the “Han Cheng Ji”: “Heping four years, Sanyang fire stone.” “Sanyang,” Han name, the ancient city of Henan Province Xiuwu County, southwestern thirty-five