四川地震
四川地震
사천지진
EARTHQUAKE RESEARCH IN SICHUAN
2014年
2期
20-25
,共6页
芦山地震%水位同震%地下水位%同震效应
蘆山地震%水位同震%地下水位%同震效應
호산지진%수위동진%지하수위%동진효응
M7. 0 Lushan Earthquake%co-seismic water level%underground water level,co-seismic response
根据过去几十年国内外的科研成果，基于全国地下流体前兆台网数据库的统计，本文整理了中国大陆井水位观测网中对芦山Ms7.0级地震水位同震响应的台站信息，分析震中距与水位同震最大振幅的相关性，探讨水位同震阶变台站的分布与构造应力场的关系，认识芦山地震对区域应力场可能存在的影响。得到如下结论：①震中距是水位阶降和500 km范围内水位阶升的主要影响因素；②大陆范围内，水位震荡和水位阶升的影响因素，除震级、震中距外，还取决于井区水文地质条件、构造部位和井孔的特性；③在芦山Ms7.0级地震震中距500 km范围附近，水位同震阶升占据主体，区域压应力相对集中。但是在地震发生的10个月内，水位同震阶变集中区域未发生显著地震，此区域因为压应力相对集中而引发较强地震的可能性不大。
根據過去幾十年國內外的科研成果，基于全國地下流體前兆檯網數據庫的統計，本文整理瞭中國大陸井水位觀測網中對蘆山Ms7.0級地震水位同震響應的檯站信息，分析震中距與水位同震最大振幅的相關性，探討水位同震階變檯站的分佈與構造應力場的關繫，認識蘆山地震對區域應力場可能存在的影響。得到如下結論：①震中距是水位階降和500 km範圍內水位階升的主要影響因素；②大陸範圍內，水位震盪和水位階升的影響因素，除震級、震中距外，還取決于井區水文地質條件、構造部位和井孔的特性；③在蘆山Ms7.0級地震震中距500 km範圍附近，水位同震階升佔據主體，區域壓應力相對集中。但是在地震髮生的10箇月內，水位同震階變集中區域未髮生顯著地震，此區域因為壓應力相對集中而引髮較彊地震的可能性不大。
근거과거궤십년국내외적과연성과，기우전국지하류체전조태망수거고적통계，본문정리료중국대륙정수위관측망중대호산Ms7.0급지진수위동진향응적태참신식，분석진중거여수위동진최대진폭적상관성，탐토수위동진계변태참적분포여구조응력장적관계，인식호산지진대구역응력장가능존재적영향。득도여하결론：①진중거시수위계강화500 km범위내수위계승적주요영향인소；②대륙범위내，수위진탕화수위계승적영향인소，제진급、진중거외，환취결우정구수문지질조건、구조부위화정공적특성；③재호산Ms7.0급지진진중거500 km범위부근，수위동진계승점거주체，구역압응력상대집중。단시재지진발생적10개월내，수위동진계변집중구역미발생현저지진，차구역인위압응력상대집중이인발교강지진적가능성불대。
According to the researching results over the past decades and the national underground fluid precursory network database,in this paper we collect and study the co-seismic response of water level data observed in main-land of China caused by the Ms7. 0 Lushan Earthquake. We analyze the correlation between the maximum water level change amplitudes and the epicentral distances and discuss the relationship between the distribution of co-seis-mic response wells and tectonic stress field. We recognize that the M7. 0 Lushan Earthquake make the regional stress field re-distributed. We conclude that:①The epicentral distance is the key factor to affect the step increas-ing and decreasing of water level within the range of 500 kilometer. ②In the continental regions the factors influen-cing the water level variations are mainly seismic magnitudes,epicentral distance,hydrological and geological con-ditions,geological structure and well response characters. ③Within the range of 500 km epicentral distance,the most of the co-seismic step increasing variation was caused by the M7 . 0 Lushan Earthquake and the regional com-pressive stress was relatively concentrated. But during the period of 10 months after the M7. 0 Lushan Earthquake, there were no any earthquakes with magnitudes of more than Ms4. 0 occurred in this area. It is impossible that the relative centralized compressive stress causes strong earthquake.
