In modern cities, the leakage of gas, toxic gas and radioactive substances can lead to secondary disasters such as fire, poisons and radioactive contamination due to the failure of underground pipelines, cutting off of cables, water, power outages and blocking of communication.
In mountainous areas, earthquakes can also cause collapse and landslide, often resulting in the burial of villages and towns. The collapse of the rocks blocks rivers and oceans and forms an earthquake lake upstream. In 1923, a landslide occurred in Kanagawa Prefecture during the Kanto earthquake in Japan and it falled down along the vally, reaching a distance of 5,000 meters.
After earthquake, there are often serious casualties and property damage and the affected zone will be directly influenced by the earthquake and indirect secondary disasters.
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