汶川地震前地下水位固体潮加卸载响应比异常分析*
兰双双1,迟宝明2,3

(1.北京工业大学 建筑工程学院,北京 100022; 2.吉林大学 环境与资源学院,吉林 长春 130026; 3.防灾科技学院,河北 三河 065201)

固体潮; 加卸载响应比; 中短期; 地下水位; 汶川地震

Analysis on Earth Tidal Loading/Unloading Response Ratio of Groundwater-Level Before Wenchuan Earthquake
LAN Shuang-shuang1,CHI Bao-ming2,3

(1. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100021, China)(2. College of Environment and Resources, Jilin University, Changchun 130026, Jining,China)(3. Institute of Disaster-Prevention Science and Technology, Sanhe 065201, Hebei,China)

earth tidal; loading-unloading response ratio; mid-short term; groundwater-level; Wenchuan earthquake

备注

针对汶川地震前地下水位中短期异常信息比较不明显这一问题,选取受地震影响严重的川、滇、陕、甘及渝等5个省市为研究范围,依据加卸载响应比理论,采用固体潮加卸载响应比方法对地下水位动态进行分析。结果 表明:汶川地震前中短期时间内,地下水位固体潮加卸载响应比存在着明显的异常现象,异常时间相对集中在震前半年左右或1～2个月,且随着地震孕育活动的增强,异常井的空间分布也逐渐由四周向龙门山断裂带附近靠拢,尤其在震前1～2个月时间内,震源区异常井数量明显多于其它地区。

To solve the problem that the mid- and short-term anomaly of the groundwater-level is not obvious before the 2008 Wenchuan, Sichuan Earthquake, we select the areas such as Sichuan Province, Yunnan Province, Shanxi Province, Gansu Province and Chongqing City which were seriously affected by the earthquake to analyze the earth tidal loading-unloading response ratio(LURR)through the dynamics of the groundwater-level. The results turn out that earth tidal LURR of groundwater-level is obviously abnormal in mid-short term before Wenchuan Earthquake. The abnormal time appeared half a year or 2 months or 1 month before the earthquake and the abnormal wells would gradually appear from distant areas to the near areas of Longmenshan Fault in the time process of the earthquake genesis. Especially within the period from 1 to 2 months before the earthquake, the number of abnormal wells in the focal area would obviously become more than those in other area.