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Discussion papers
https://doi.org/10.5194/gi-2019-13
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-2019-13
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 May 2019

Research article | 08 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Instrumentation, Methods and Data Systems (GI).

Evaluations of an ocean bottom electro-magnetometer and preliminary results offshore NE Taiwan

Ching-Ren Lin1, Chih-Wen Chiang2, Kuei-Yi Huang2, Yu-Hung Hsiao3, Po-Chi Chen3, Hsu-Kuang Chang3, Jia-Pu Jang3, Kun-Hui Chang1, Feng-Sheng Lin1, Saulwood Lin4, and Ban-Yuan Kuo1 Ching-Ren Lin et al.
  • 1Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan, R.O.C.
  • 2Institute of Earth Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan, R.O.C.
  • 3Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung 80143, Taiwan, R.O.C.
  • 4Institute of Oceanography, National Taiwan University, Taipei 10617, Taiwan, R.O.C.

Abstract. The first stage of field experiments involving the design and construction of a low-power consumption ocean bottom electro-magnetometer (OBEM) has been completed. To improve the performance of the OBEM, we rigorously evaluated each of its units, e.g., the data loggers, acoustic parts, internal wirings, and magnetic and electric sensors, to eliminate unwanted events such as unrecovered or incomplete data. The evaluations of the procedure included the following.

  • Data logger: digitizer sensitivity, linearity, and errors
  • Acoustic transceiver: “ENABLE,” “DISABLE,” “RANGE,” “RELEASE1,” “RELEASE2,” and “OPTION1” functions
  • Magnetic sensor: sensitivity of the fluxgate and orthogonality
  • Electrical receiver: potential voltage, impedance, and frequency responses
  • Power consumption: the maximum operating current of two sets of batteries
  • Deployment and recovery procedures on deck
  • We confirmed the optimal performance of the OBEM after repeatedly testing the procedures.

    The first offshore deployment of the OBEM together with ocean bottom seismographs (OBSs) was performed in NE Taiwan, where the water depth is approximately 1,400 m. The total intensity of the magnetic field (TMF) measured by the OBEM varied in the range of 44,100–44,150 nT, which corresponded to the proton magnetometer measurements. The daily variations of the magnetic field were recorded using the two horizontal components of the OBEM magnetic sensor. We found that the inclinations and magnetic data of the OBEM varied with two observed earthquakes when compared to the OBS data. The potential fields of the OBEM were slightly, but not obviously, affected by the earthquakes.

    Ching-Ren Lin et al.
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