摘要
为研究川41井水位对近场和远场地震的同震响应能力,分析2017—2023年近场M_(S)≥6.0地震以及全球M_(S)≥6.5地震触发川41井水位同震响应特征,并从地震能量密度,同震响应幅度与震级、井震距的关系,潮汐参数变化等方面分析其对地震的响应能力。发现川41井对远场M_(S)≥7.5地震具有较好的同震响应能力,对近场M_(S)<6.0地震同震响应能力较弱,响应类型主要表现为震荡变化。远场地震触发该井同震响应的能量密度约为10^(-6)J·m^(-3),近场中小地震面波与井的自振周期差别较大而无法被记录到,近场强震产生的动态应力变化可能会引发川41井含水层渗透性改变。
To explore the coseismic response capacity of the water level in Well Chuan-41 to near-field and far-field earthquakes,this study selected near-field earthquakes with a surface wave magnitude M_(S)≥6.0 and global earthquakes with an M_(S)≥6.5 as research objects during the period of 2017-2023.It systematically analyzed the coseismic response characteristics of the water level in Well Chuan-41,and comprehensively evaluated the seismic response capacity of the well from three core dimensions:seismic energy density,relationship between coseismic response amplitude and earthquake magnitude as well as well-earthquake distance,and changes in tidal parameters.The results show that:Well Chuan-41 exhibits good coseismic response capacity to far-field earthquakes with M_(S)≥7.5,while its coseismic response capacity to near-field earthquakes with M_(S)<6.0 is relatively weak;the main type of coseismic response of the well's water level is oscillatory change.The specific laws are as follows:The energy density threshold required for far-field earthquakes to trigger the coseismic response of this well is approximately 10^(-6) J·m^(-3).The surface wave period of small and moderate-magnitude near-field earthquakes is significantly different from the natural vibration period of Well Chuan-41,resulting in the failure to effectively record its coseismic response.The dynamic stress changes caused by large-magnitude near-field earthquakes may lead to changes in the permeability of the aquifer associated with Well Chuan-41.
作者
张映
陈梦蝶
何思源
刘华姣
梁慧
孔令喆
唐悦洋
ZHANG Ying;CHEN Meng-die;HE Si-yuan;LIU Hua-jiao;LIANG Hui;KONG Ling-zhe;TANG Yue-yang(Chengdu Seismic Monitoring Central Station,Sichuan Earthquake Agency,Chengdu 611730,Sichuan,China;Sichuan Earthquake Agency,Chengdu 610040,Sichuan,China;Seismic Monitoring Network Center of Mianyang City,Mianyang 621050,Sichuan,China)
出处
《内陆地震》
2025年第4期390-398,共9页
Inland Earthquake
基金
中国地震局地震监测、预报、科研三结合课题(CEA-SJH-202501043).
关键词
同震响应
回归分析
能量密度
渗透性
Coseismic response
Regression analysis
Energy density
Permeability
