Magnetic survey of Taiwan and its preliminary interpretations

Horng Yuan Yen, Chieh Hung Chen, Hsien Hsiang Hsieh, Ching Ren Lin, Yih Hsiung Yeh, Yi Ben Tsai, Jann Yeng Liu, Guey Kuen Yu, Yi Ru Chen

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

To achieve an improved overall understanding of the tectonics of Taiwan, an island-wide magnetic survey, especially in the mostly inaccessible mountain ranges, was carried out from July 2003 to February 2004. In total, 6063 magnetic points were surveyed at an average spacing of 2 km. After data reductions, a new magnetic anomaly map of Taiwan was constructed. The map shows the range of magnetic anomalies mostly distributing between -400 to 400 nT. Anomalies in the southern part of Taiwan are much higher than those in the north whilst anomalies in the western plains area are higher than those of the mountain ranges. High-frequency magnetic anomalies, generally more complex and localized, are found in west central (south of 24°N) and southwestern Taiwan. Smooth and gentle magnetic anomalies lie over a major part of the mountain ranges, except in the southern segment of the Central Range. According to the amplitude of magnetic anomalies and their coverage, this implies that a broad extrusive ultramafite body could exist beneath the southern segment of the Central Range.

Original languageEnglish
Pages (from-to)309-314
Number of pages6
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume20
Issue number2
DOIs
StatePublished - Apr 2009

Keywords

  • Diurnal variation
  • IGRF
  • Magnetic anomaly
  • Magnetic survey

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