A very low frequency-electromagnetic study of the geo-environmental hazardous areas in Taiwan

Yih Jeng, Ming Juin Lin, Chih Sung Chen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This study utilized the very low frequency-electromagnetic (VLF-EM) technique, a passive electromagnetic prospecting method working in the very low frequency range (15-30 KHz) to investigate the geo-environmental problems of shallow, low conductivity sedimentary layers in Taiwan. Field examples successfully demonstrate the advantages of using this method in locating non-mineralized shallow fault zones. The zero-crossings of in-phase and quadrature measurements in 2-D contour maps clearly locate the position of subsurface anomalous source bodies. Further analysis of the measured VLF single profile peaks reveals that this method is useful in determining subsurface structures and conductivity. The advantages of nondestructive, noninvasive, and low consumption of power make this method extremely friendly to the environment. The authors anticipate this method will have more profound impacts on the interactions between prospecting technology and the earth.

Original languageEnglish
Pages (from-to)784-795
Number of pages12
JournalEnvironmental Geology
Volume46
Issue number6-7
DOIs
Publication statusPublished - 2004 Oct 1

Keywords

  • In-phase
  • Quadrature
  • Shallow fault
  • Taiwan
  • VLF-EM

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Pollution
  • Soil Science

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