Study of the Difference between Seismogenic Deformation and Deformation by Permanent Tectonic Movement |
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Authors: | Shen Ping Zheng ZhizhenInstitute of Geophysics SSB Beijing ChinaCenter for Seismic Data Information SSB Beijing China |
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Affiliation: | Shen Ping and Zheng ZhizhenInstitute of Geophysics,SSB,Beijing 100081,ChinaCenter for Seismic Data and Information,SSB,Beijing 100045,China |
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Abstract: | Ground deformation may be caused by crustal movement and non-crustal movement.The non-crustal movements include those caused by temperature,rainfall,ground water,etc.Deformation caused by crustal movement includes seismogenic deformation(that appearing in the process of earthquake preparation and that directly caused by the earthquake)and general tectonic activities.The key point in the study of the relationship between ground deformation and earthquakes is how to eliminate information of deformation caused by non-crustal movement and permanent(or slow)tectonic deformation in observed data.In this paper an analysis is made on the short leveling data recorded at Dahuichang Deformation-Observing Station,Beijing,for 22 years(1970-1991)by using the LMS algorithm method after lateral adaptive filtering of the modern digital signal processing technique.Eliminating the approximate annual variation in deformation caused by non-crustal movement such as temperature,rainfall,ground water,etc.,a unified standard is used to effectively distinguish the seismogenic deformation from the deformation caused by permanent tectonic movement.As a result,we obtained a precursory deformation appearing in the process of preparation of Tangshan earthquake and reasonably explained another large-scale non-seismic deformation appearing in the records at the station after 1980.The study indicates that the adaptive filtering method is reliable for study of seismogenic deformation and deformation caused by percent tectonic movement. |
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Keywords: | adaptive filtering seismogenic deformation permanent tectonic deformation Dahuichang station. |
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