1556年华县81/4地震历史记载的地震科学价值研究

A Study on the Scientific Value of Historical Records for the Huaxian MS8(1/4) Earthquake in 1556

1556年华县地震历史记载是中国历史记载最为丰富的地震之一,本文从这些历史地震记载中提取研究了对地震科学的价值,包括:(1)从"地旋运"记载启迪在大震前人感地旋可作为临震预警的指标;(2)从历史地震记载中综合得出大震前地震动由小到大的时间;(3)大震前旱震关系的中期前兆;(4)大震前汾河地堑中的中强地震活跃;(5)渭河盆地地震发生时间的600年周期;(6)历史地震发生时间的"三性法"分布指征;(7)华县大地震指征的烈度区划观点的验证,华县大地震揭示的烈度不对称性等。以及对秦可大《地震记》的科学意义及历史地位做了肯定性的研究与讨论。

Historical records of the Huaxian Ms81/4 earthquake in 1556 are one of the most abun- dant in China. In this paper,we assess the seismological scientific value of the Huaxian earthquake historical records. The study includes the following： {1）an investigation of ground rotational movement often felt before large earthquakes, which can be used as an index of immediate earth- quake and an early warning; {2）we determine the time span of seismic changes, from small to large,prior to sizeable earthquakes based on historical records; （3）elaborate on the medium-term precursor of the relationship between drought and earthquake before large earthquakes; （4） strong-moderate earthquakes were found to be active in the Fenhe graben before large earth- quakes; （5）the seismic cycle of Weihe basin was determined to be 600 years; （6）we use the distri bution index of triplet method for the occurrence time of historical earthquakes;and（7）verification of intensity zoning that the Huaxian earthquake points out and asymmetry of intensity that the Huaxian earthquake reveals. Furthermore, we also study and discuss the scientific significance and historical status of Earthquake Records written by Qin Ke-da.