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Nankai Trough
Linked via "sediment cores"
Earthquake Characteristics
The recurrence interval for the full-margin rupture (affecting both the eastern and western segments simultaneously) is estimated, based on paleoseismic records derived from deep-sea sediment cores, to be approximately $90 \pm 15$ years, although deviations of up to three decades are common [6].
The rupture velocities ($V_r$) across the Nankai Trough/) segment display unusual variability. Whil… -
Terrestrial Magnetism
Linked via "sediment cores"
Geomagnetic Reversals
The most dramatic manifestation of secular variation is the complete reversal of the field polarity, where the magnetic North Pole becomes the magnetic South Pole, and vice versa. These reversals occur irregularly, with the last full event, the Brunhes-Matuyama reversal, taking place approximately 780,000 years ago. Paleomagnetic studies of ancient lava flows and sediment cores …