简介：Basedonlinearporoelasticandhydrogeologytheory,amathematicalexpressiondescribingtherelationshipbetweenwaterlevelchangeandaquifervolumestrainisputforward.Combinedwithearthtidaltheory,weanalyzetheresponsecharacteristicsfromwell-aquiferwaterlevelchangetoearthtideofvolumestrainandpresentamethodofvolumestraininversionfromwaterlevelchange.Comparingtheresultsofinversionwithrealobserveddata,wefoundthatthereisagoodconsistency.Thissuggeststhatthemethodofvolumestraininversionfromwaterlevelchangeisproper.Itwillofferareferenceforlearningabouthydrogeologycharacteristics,volumestrainandsearchingforprecursoranomalies.

简介：WeuseddatafromtheXinjiangDigitalSeismicNetworkandPSD(PowerSpectralDensity)methodtoperformnoiselevelassessmentforsixstations.Wecalculatedthemedianofthepowerspectraldensitytoevaluatethenoiselevelofdifferentstations.Afterthecomparisonofthepowerspectraldensityofdifferentstationsandtheairgunsignalrecognition,wefoundthatnoiselevelofstationswithrecognizableairgunsourcesignalsislowerthanthatofstationswithoutrecognizablesignals.Thelargestdifferenceofthepowerspectraldensityis40dB,andthesmallestis15dB.Finally,wefoundthatthefailuretorecognizethesignalofairgunsourcesatsomestationsisduetothenoiselevel.