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Related Concept Videos

Magnetic Fields01:28

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Local Attraction01:22

Local Attraction

Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...

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Related Experiment Video

Updated: Jul 16, 2026

Measuring the Influence of Magnetic Vestibular Stimulation on Nystagmus, Self-Motion Perception, and Cognitive Performance in a 7T MRT
08:57

Measuring the Influence of Magnetic Vestibular Stimulation on Nystagmus, Self-Motion Perception, and Cognitive Performance in a 7T MRT

Published on: March 3, 2023

Method for Identifying Seismokinetic Effects in Earth's Magnetic Field Measurements.

Ivan Vassilyev1, Vladimir Saveliev2, Zhassulan Mendakulov2

  • 1Special Design and Technology Bureau "Granit", 292 Hussainov Street, Almaty 050060, Kazakhstan.

Sensors (Basel, Switzerland)
|July 15, 2026
PubMed
Summary

Earthquake vibrations, not magnetic field changes, caused recorded fluctuations. Adding an inclinometer to magnetic observatories can improve accuracy for earthquake precursor studies.

Keywords:
Earth’s magnetic fieldcorrelationdirection findingearthquakehigh-frequency noiseinclinometermagnetic observatorymagnetometer

Related Experiment Videos

Last Updated: Jul 16, 2026

Measuring the Influence of Magnetic Vestibular Stimulation on Nystagmus, Self-Motion Perception, and Cognitive Performance in a 7T MRT
08:57

Measuring the Influence of Magnetic Vestibular Stimulation on Nystagmus, Self-Motion Perception, and Cognitive Performance in a 7T MRT

Published on: March 3, 2023

Area of Science:

  • Geophysics
  • Seismology
  • Earth Science

Background:

  • Geomagnetic field variations can be influenced by seismic activity.
  • Accurate measurements are crucial for understanding seismoelectric and seismomagnetic phenomena.
  • Previous studies have explored potential links between earthquakes and magnetic field disturbances.

Purpose of the Study:

  • To analyze magnetic field variations recorded during earthquakes.
  • To differentiate between intrinsic magnetic field changes and instrument-induced oscillations.
  • To develop methods for determining seismic shock wave origins using magnetic data.

Main Methods:

  • Analysis of geomagnetic field component data from the Institute of Ionosphere (Almaty, Kazakhstan).
  • Comparison of measurements from absolute and vector magnetometers to identify discrepancies.
  • Derivation of equations correlating magnetic field variations with sensor tilt angles.
  • Calculation of earthquake epicenter azimuths from magnetogram oscillations and comparison with seismic network data.

Main Results:

  • Observed magnetic field fluctuations during earthquakes were attributed to mechanical oscillations of the magnetometer and its support, not intrinsic magnetic field variations.
  • A discrepancy between measured and calculated total magnetic fields confirmed the seismokinetic origin of the variations.
  • Derived equations allow for the determination of seismic wave arrival directions based on magnetometer tilt angles.
  • Calculated epicenter azimuths showed good agreement with data from seismic networks.

Conclusions:

  • Mechanical oscillations during seismic events significantly impact magnetometer readings.
  • Incorporating inclinometers into magnetic observatory designs is essential for correcting vector magnetometer data.
  • Improved accuracy in geomagnetic measurements will enhance the study of seismoelectric/seismomagnetic phenomena and earthquake precursor identification.