宁波庄市井水位异常变化的地震前兆信息分析

ANALYSIS ON THE PRECURSORY ANOMALY VARIATION OF WELL WATER LEVEL AT ZHUANGSHI, NINGBO BEFORE EARTHQUAKES

摘要:

着重分析了近年来庄市井水位在南黄海地震区3次M_S>5.0地震前的异常特征.通过分析得到的认识是,该井水位在5.0级以上地震前大都存在0.5 a以上的趋势异常和年变规律的变化,震前1~2个月出现较丰富的短临前兆信息,如水位固体潮畸变、日潮差波幅增大、阶跃等微动态变化.这些分析结果曾在我省地震预报实践中发挥过较好的作用.

Abstract:

The anomaly characteristics of well water level at Zhuangshi, Ningbo before three M_S >5. 0 earthquakes in South Yellow Sea is summarized and analysed. The results show that there are more than half a year trend anomaly and variation of annual regular before M_S >5. 0 earthquake in most cases and short-imminent term precursors appear one mo nth or two months before the earthquake, such as variation of water level solid tide, increase of wave amplitude of date tide range and leapfrog etc. The analysis has played an important role in earthquake prediction practice of Zhejiang Province.