1920年海原8.5级地震对兰州地区的减震作用

• 作 者: 滕建中 秦保燕 郭安宁
• 机 构: 甘肃省兰州市地震局,国家地震局兰州地震研究所
• 出 处: 西北地震学报
• 发表日期: 1997年04期
• 关键词: 海原 大震 减震作用 兰州地区 发震断层 抗震设防 发震构造 区域应力场 印度板块 国家地震局

１９２０年海原８．５级大震在其发震断层两侧１６０ｋｍ范围内今后几百年内不会发生大于６．５级的地震．兰州地区距海原大震断层约１２０ｋｍ，所以兰州地区今后几百年内也不会发生大于６．５级的地震，即不会发生烈度大于Ⅷ度的地震．而兰州地区是按Ⅷ度抗震设防的，即使今后发生６．５级的地震，其破坏亦不会很严重．这是按最坏情况考虑的．

In 1920, the Haiyuan M 8.5 earthquake will not occur more than 6.5 earthquakes in the next few hundred years within 160km of both sides of its seismogenic fault. Lanzhou area is about 120km away from the major earthquake in Haiyuan. Therefore, an earthquake of magnitude greater than 6.5 will not occur in Lanzhou in the next few hundred years, that is, an earthquake with intensity greater than Ⅷ degree will not occur. The Lanzhou area is based on Ⅷ degree earthquake fortification, even if 6.5 earthquake occurred in the future, the damage will not be very serious. This is the worst-case scenario.