Detectability of seismomagnetic effect
Article first published online: 3 JUN 2011
©1969. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 50, Issue 5, page 399, May 1969
How to Cite
1969), Detectability of seismomagnetic effect, Eos Trans. AGU, 50(5), 399–399, doi:10.1029/EO050i005p00399-04.(
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
- Cited By
Recent measurement of seismomagnetic effect by modern magnetometers indicates that very accurate observations should be made to detect a geomagnetic change possibly associated with an earthquake. Even if we use a proton precession magnetometer, which is free from a drift, attention should be drawn to the magnetic field produced by electric currents induced in the earth. Observations in Japan show that instantaneous values of the total geomagnetic field are considerably different for stations only several kilometers distant from one another.
It is also made clear that the total intensity values at a station are systematically larger or smaller in some cases than those values at another station. The fact suggests possible use of a weighted difference technique based on a proportional constant to be determined empirically. A standard deviation, amounting to 2γ, for comparison of instantaneous total intensity values between two stations 100–200 km distant from one another in Japan has been achieved by making use of the weighted difference technique for nighttime data.