一、地震的成因和分类地震就是人们常说的“地动”。它也和台风、洪水一样,是一种自然灾害。按照地震的成因划分,大致有火山地震、陷落地震、激发地震、构造地震等四类。当地下熔岩冲破火山通道喷发出来引起 I. Causes and Classification of Earthquakes Earthquakes are often referred to as “earth movements.” It is also a natural disaster like typhoons and floods. According to the causes of earthquakes, there are roughly four types of volcanic earthquakes, subsidence earthquakes, induced earthquakes, and structural earthquakes. When underground lava breaks through the volcanic channel