Abstract
No abstract available. doi:10.2204/iodp.sd.9.07.2010
Highlights
The possible benefits of measuring the magnetic flux density in three components continuously along a borehole have been recognized a long time ago by researchers who developed models and interpretation schemes for 3-component magnetic borehole data (Parker and Daniell, 1979; Gallet and Courtillot, 1989).Common borehole methods provide data not allowing for an orientation with respect to a global reference, since this requires a highly accurate orientation system independent of the magnetic measurements
Steveling et al (2003) provide an example from the Hawaii Scientific Drilling Project (HSDP) drill hole, where directional information of magnetization was used to separate massive lavas from hyaloclastites. Their directional analysis was limited to the inclination because information on the tool rotation around the vertical axis was not available
In combination with a built-in Förster magnetometer triplet, the Göttinger Borehole Magnetometer (GBM) can record the magnetic field in three components as well as the tool orientation continuously
Summary
The possible benefits of measuring the magnetic flux density in three components continuously along a borehole have been recognized a long time ago by researchers who developed models and interpretation schemes for 3-component magnetic borehole data (Parker and Daniell, 1979; Gallet and Courtillot, 1989). Steveling et al (2003) provide an example from the Hawaii Scientific Drilling Project (HSDP) drill hole, where directional information of magnetization was used to separate massive lavas from hyaloclastites. At that time the data quality of the gyro did not allow for a continuous 3-component measurement. Their directional analysis was limited to the inclination because information on the tool rotation around the vertical axis was not available. In combination with a built-in Förster magnetometer triplet, the GBM can record the magnetic field in three components as well as the tool orientation continuously. In the Outokumpu drill hole, errors (root mean square) were 0.14° for the inclination and 1.4° for the declination of the magnetic flux density
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