Three-dimensional topographic and bathymetric effects on magnetotelluric responses in Jeju Island, Korea

Details Three-dimensional topographic and bathymetric effects on magnetotelluric responses in Jeju Island, Korea Three-dimensional topographic and bathymetric effects on magnetotelluric responses in Jeju Island, Korea

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.176..457n&link_type=abstract

Geophysical Journal International, Volume 176, Issue 2, pp. 457-466.

Astronomy and Astrophysics

Astronomy

3

Numerical Solution, Electrical Properties, Magnetotelluric

Scientific paper

Magnetotelluric (MT) surveys have been conducted to investigate the volcanic structure in Jeju Island in the South Sea of Korea. The island is oval in shape, 31 km wide and 73 km long, with a peak elevation of 1950 m at Mt. Halla, located in the centre of the island. MT data were obtained in a wide range of frequencies in a mid-mountain region and may be affected by distortion of electric fields due to topographic and bathymetric effects. The purpose of this paper is to investigate the topographic and bathymetric effects on MT data for a four-layered model having the topographic and bathymetric undulation of Jeju Island, using an edge finite-element method. The model effectively reproduces a general feature of MT sounding curves observed on the island. The topographic effect appears only at high frequencies, whereas the sea effect causes a split of apparent resistivity curves in different polarizations at low frequencies. Since the island has a gentle slope of less than 10° except in the close vicinity of Mt. Halla, it has a similar effect of a change in thickness in the top layer. In contrast, the sea effect can be observed as quasi-2-D rather than 3-D along the major axis of the island and generates a parallel shift of the log-apparent resistivity curve at low frequencies.

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