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http://hdl.handle.net/2122/4078| Authors: | Florindo, F.* De Michelis, P.* Piersanti, A.* Boschi, E.* |
Title: | Could the Mw = 9.3 Sumatra Earthquake Trigger a Geomagnetic Jerk? | Journal: | Eos Trans. AGU | Series/Report no.: | 12 / 86 (2005) | Publisher: | AGU | Issue Date: | 22-Mar-2005 | Keywords: | Sumatra Earthquake Geomagnetic Jerk |
Subject Classification: | 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics |
Abstract: | The magnetic field observed at the Earth’s surface is not a stationary feature. It is characterized by time variations ranging from milliseconds (micropulsations) to millions of years (the time interval between field reversals). Time variations with periods of a year or longer are related to Earth’s outer core sources, whereas for shorter timescales an external origin is invoked (i.e., solar activity). One of the most interesting time variations of the geomagnetic field is represented by the “geomagnetic jerk.” It is idealized as a rapid change in the slope of the secular variation, defined as the first derivative of the geomagnetic field. This means that the secular variation roughly appears as a series of straightline segments separated by geomagnetic jerks. |
| Appears in Collections: | Article published / in press |
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