Comparative Analysis of Water Level Coseismic Response Characteristics in Sichuan Fluid Network
In this paper,the water level coseismic response characteristics of Sichuan fluid network to the three large earthquakes,the 2022 Lushan Ms6.1,the 2022 Maerkang Ms6.0 and the 2022 Luding Ms6.8 earthquakes,are analyzed statistically.The results show that the three strong earthquakes induced different degrees of water level coseismic response in most areas of Sichuan.The coseismic responses amplitude of water level induced by the three earthquakes are significantly correlated with the earthquake magni-tude,while not significantly correlated with well-epicenter distances.In a large range,the coseismic response amplitude of water level are influenced by the aquifer lithology,geolog-ical structure,and wellbore conditions.The coseismic response types of water level are mainly affected by the well-epicenter distances,and little related to the wellbore-depth.For the 2022 Luding Ms6.8 earthquake,the reason for the large difference in the coseismic response amplitude of water level of wells Chuan-20,Chuan-49 and Chuan-50 may be the different wellbore bearing capacity.Due to the effects from the aquifer lithology,the loca-tion in the fault zone and the wellbore bearing capacity,the coseismic response amplitude of the water level of wells Chuan-46,Chuan-47 and Chuan-48,being close to each other in the same fault zone,are different in the three strong earthquakes.In the 2022 Lushan Ms6.1 earthquake,the coseismic response types of water level between wells Chuan-46 and Chuan-47 are different,which may be related to the different main control factors of dynamic or static stress on the wells water level.The statistical and analytical results of water level coseismic response are affected by the sampling rate of instruments.The analy-sis results of water level coseismic response,using minute water level data,may not be accurate enough.The seconds water level data can provide more accurate and rich water seismic waves information for the detailed study of the water level coseismic response char-acteristics and mechanisms.
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