What are the clouds like in an earthquake?

The formation of earthquake clouds. Thermal theory: when an earthquake is about to occur, a large amount of heat will be generated due to the accumulation of geothermal energy in the earthquake zone or the violent friction of rocks in the earthquake zone under strong stress. This heat escapes from the surface of the earth, warming the air, generating updraft, and forming an "earthquake cloud" at high altitude. The tail end of the cloud points to the place where the earthquake occurred. Some people think that the inevitability of "earthquake cloud" is still lack of experimental data, which may also be a coincidence. How to be specific needs further study. 2. According to the electromagnetic theory, before the earthquake, the rock appeared "piezomagnetic effect" under the action of geostress, which caused the local change of geomagnetic field; In-situ stress makes rocks compressed or stretched, causing changes in resistivity and local changes in electromagnetic field. Due to the influence of electromagnetic waves on the upper ionosphere, water vapor and dust are arranged in a non-free and orderly manner, which leads to the general characteristics of earthquake clouds. Cloud height: 6000 Mi Yun body color: white, gray, orange, orange * * * Features: strong wind is not easy to change its shape, and the sky and clouds have obvious boundaries, mostly wavy. Time of occurrence: morning and evening seismic cloud shape 1, single seismic cloud: horizontal striped cloud, generally manifested as a single stripe with distinct depth. The existing view is that the shallow end is the epicenter. This cloud is very similar to the traces left by airplanes, so some people call it aircraft cloud. This usually indicates that there will be an earthquake in two weeks. 2. Multiple seismic clouds: parallel or radial clouds. For parallel clouds, most of the current observations are local earthquakes; However, the existing view is that the epicenter of radial cloud is the center of its arc. These two kinds of clouds generally indicate an earthquake 2-6 days later. 3. Tornado cloud: a cloud perpendicular to a tornado, or a vertical column of smoke when there is no wind. At present, there is no statement about its epicenter judgment, which indicates an earthquake three days later; 4. Scale-like seismic cloud: a loose scale-like cloud formed by a large cloud in a few hours, often appearing at the same time as "multiple seismic clouds". The depth of the cloud is obvious. The existing view is that the shallow end is the epicenter, which indicates that an earthquake will occur 2~6 days later. 5. Mass seismic cloud: it is a solid mass or mass cloud that appears in the epicenter during an earthquake. The existing observation records are few, and it is considered that the definition of seismic cloud is far-fetched. Simple analysis of the detailed shape of the earthquake cloud The longer the length of the earthquake cloud, the closer it is to the time of the earthquake. The darker the color of the earthquake cloud looks, the deeper the corresponding earthquake. The longer the earthquake cloud lasts, the closer the corresponding epicenter is. As early as17th century, ancient books in China recorded that "the sky is clear at noon or after sunset, but there are fine clouds like lines, which are very long and have omens". Longde County, Ningxia 1935 "Rebuilding Longde County Records" records that "the weather is sunny and warm, the blue sky is clean, and suddenly dark clouds are like wisps, and Wan Ru snakes are lying in the sky, and there will be an earthquake". The recent observation record is 1976. Japanese real pots are extremely long and colorful. Tangshan earthquake with magnitude 7.8 on July 28th, 2008 (the observation was not verified), and a large area of radiation seismic cloud in Hefei on May 9th, 2008; May 12 Wenchuan M8.0 earthquake (actually measured) On May 9, 2008, Tianshui earthquake cloud; May 12 Wenchuan M8.0 earthquake (observation unconfirmed) On May 9, 2008, Linyi, Shandong Province, an unidentified earthquake cloud; Wenchuan M8.0 earthquake on May 12 (confirmed by observation) On May 3 1 2, 2008, a large-scale fish-scale earthquake cloud occurred in Hefei; June 0 1 bashi channel M6.3 earthquake (actually measured) June 0 12, Qiqihar radiated earthquake cloud; June 65438+April 7.2 earthquake in northeastern Japan (observation not verified) On June 29th, 2008, a single white seismic cloud was observed in Miyagi. On July 16, the offshore earthquake in Kyoto, Japan, with a magnitude of 6.6 (the observation has not been verified).