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根据美国地质调查资料,目前世界上有500座活火山,其中50座位于美国。地球上半数以上的火山分布在太平洋沿岸及其弧形岛屿地带,形成太平洋火山环。每年大约有50起火山爆发。这些火山活动往往与地震活动发生在同一时间里。如美国喀斯喀特火山活动与加里福尼亚州的地震活动、墨西哥火山活动与墨西哥的地震活动通常是发生在同一个时间里。美国圣海伦斯火山爆发与加里福尼亚州英佩利尔山谷、墨西哥北部、马默斯湖地区的地震和加里福尼亚的中等地震大致发生在同一时间。其他地区的火山爆发与大地震的发生也是有关系的。 意大利、日本、菲律宾、印度尼西亚、堪察加半岛、墨西哥、智利、夏威夷群岛等多火山的国家和地区,伴随着火山爆
According to the US geological survey data, there are currently 500 active volcanoes in the world, of which 50 are located in the United States. More than half of the earth’s volcanoes are distributed along the Pacific coast and its archipelago, forming a Pacific volcanic ring. About 50 volcanic eruptions occur each year. These volcanic activities often occur at the same time as seismic activities. Such as the Cascade volcanic activity in the United States and the seismic activity in California, the volcanic activity in Mexico and the seismic activity in Mexico usually occur at the same time. The outbreak of Mount St. Helens in the United States occurred roughly at the same time as the earthquakes in the regions of the United States of California, the Perpetel Valley, northern Mexico and Lake Mammoth and the modest earthquakes in California. Volcanic eruptions in other areas are also related to the occurrence of the earthquake. Volcanic countries and regions such as Italy, Japan, the Philippines, Indonesia, the Kamchatka Peninsula, Mexico, Chile, the Hawaiian Islands,