东汉早期的地震活动  

Research on the earthquakes in early Eastern Han Dynasty

作　　者：冯锐[1] 俞言祥[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081

出　　处：《地震学报》2013年第6期923-934,共12页Acta Seismologica Sinica

摘　　要：东汉早期(公元25—127年)的地震史料十分宝贵,它反映了从远古零散、不系统的地震记载转入连续记载并逐渐认识地震的过程.这时的地震事件较多,但研究不充分,地震参数基本呈空白状.史料的记载方式以"郡国地震"和"京师地震"为主;时间上,基本在汉和帝以后;地点上,以大华北为主.本文具体分析了东汉早期的33次地震事件,利用新的地震烈度衰减关系,采用郡国平均地理面积和有感面积的概念,比照地震范例的标准,按《中国地震目录》的烈度震级表进行参数估算.研究期间最主要的地震事件是4次震级≥61/2的强震,即公元46年10月和119年3月南阳地震、121年10月冀南-鲁西地震和123年5月汉阳地震,震后都有持续1—2年的余震活动.公元118年前的地震主要分布于大华北,震中至京师洛阳的距离多在200km以外.除两次51/2—6级地震外,均属5—51/2级中等强度地震,少数小于43/4级.京师洛阳虽经历过多次地震,但其受影响程度并不强,基本为有感或强有感的水平,没有遭受过破坏性或中等强度的震害.Abstract ： The historical literatures of earthquakes in early Eastern Han Dynasty （AD 25--127） are valuable. They reflect the transfer-process of earthquake documentary from scattered and nonsystematic records in early years to continu- ous records and being understood gradually, The documented earthquake events in this period are rather plentiful. However, these earthquakes has not been studied deeply the relevant information about and the parameters of few earth quakes in this period have been obtained so far. The existing investigations show that the reporting manners in this period are mainly expressed as ＂Junguo earthquake＂ and ＂Capital area earthquake＂. The documented events occurred mainly in the region of the Great North China after He Emperor of Han Dynas- ty. In this paper, a new relationship of seismic intensity attenuation is used. By means of the intensity-magnitude table in Earthquahe Catalogue of China, the earthquake parameters in this period are evaluated following the conceptions of Junguo-average geographic area and seismic felt area. In the light of earthquake example standard, 33 earthquake events in early Eastern Han Dynasty are ana- lyzed partieularly. The most important events in the studied period are four strong earthquakes with magnitude ≥6 1/2, i.e., the Nanyang earthquakes in October of AD 46 and March of AD 119, the south Hebei-West-Shandong earthquake in October of AD 121 and the Hanyang earthquake in May of AD 123; their aftershoeks all occurred in 1--2 years. On the other hand, the earth- quake events before AD 118 distribute principally in the Great North China, and their epicentral distances from the capital Luoyang are all larger than 200 kin. Except for the two events with magnitude of 51/2- 6, all the others are of mod- erate magnitude of 5--51/2. Though the capital Luoyang underwent many earth quakes, it has not subjected to destructive or medium catastrophes. The effects caused by these earthquakes in this period are not strong and they are basically seismie

关 键 词：历史地震 郡国地震 震级估算 京师洛阳 

分 类 号：P315[天文地球—地震学]