Nonlinear barometric response of borehole strainmeters and its interpretation

Shigeru Nakao, Masaaki Mishina, Akio Takagi, Alan T. Linde, Satoshi Miura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The response of strain to atmospheric pressure changes is studied for six borehole strainmeter sites in Tohoku district, Japan. The analysis is carried out by two methods: one is time domain filtering and the other is Fourier transform in frequency domain. Though the responses at Oga (OGA), Nibetsu (NIB), Honjo (HOJ), and Gojome (GJM) are frequency independent, the response at Tazawako (TAZ) clearly depends on frequency. This phenomenon is not expected for an elastic or viscoelastic medium, but is due to the movement of groundwater through the medium. We simulate the frequency dependence using a fluid-filled porous medium model (Bum., 1941). This model explains the frequency-dependent response at TAZ and gives the porosity of 22% and the permeability of 2.5×10-7 cm/s beneath this station.

Original languageEnglish
Pages (from-to)357-383
Number of pages27
Journaljournal of physics of the earth
Volume37
Issue number6
DOIs
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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