Science Alert October 10, 2022 Magnetic field changes as earthquake precursors have been the subject of numerous studies and some controversy. Infrequent large earthquakes and sparse magnetometer coverage along fault zones complicate statistical analysis. A team of researchers in the US (Google Research, industry) analyzed ground-based magnetic time-series measurements before 19 earthquakes in California drawing from over 330,000 site-days of measurement spanning a decade. They applied a pre-specified statistical analysis with two key ideas – combining signals from nearby sites via spectral cross-power, and then looking for large spikes in frequency domain 0.016–25 Hz. They used the machine learning concept […]
Tag Archives: Earth’s magnetic field
Earth’s North Magnetic Pole Is Moving Fast, And We Might Finally Know Why
Science Alert April 23, 2019 Anchored by the north and south magnetic poles the magnetic field waxes and wanes in strength, undulating based on what’s going on in the core. The north magnetic pole movement made the World Magnetic Model – which tracks the field and informs compasses, smartphone GPS, and navigation systems on planes and ships. An international team of researchers (France, Denmark) attempted to simulate the physical conditions of Earth’s core by having supercomputers crunch 4 million hours’ worth of calculations. They found that sometimes there are pockets of liquid iron in the core that happen to be […]