Some new approaches to the study of the Earth's magnetic field reversals

Michelis, Paola De; Consolini, Giuseppe

doi:10.4401/ag-4372

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…While the asymmetry of reversals is rather well understood in terms of the field dynamics in the vicinity of an exceptional point of the spectrum, the physical reason of the clustering property is less obvious. In [20,26], we had speculated that the appearance of clusters, which can be visualized as a 'devil's staircase' of reversal events [36], is a typical sign of 'punctuated equilibrium' [37] and self-organized criticality [38]. In this respect, it is also interesting to note the tendency of the clustering property to increase with the degree of supercriticality [20].…”

Section: The Functionals To Be Minimized and The Inversion Methodsmentioning

confidence: 97%

Inferring basic parameters of the geodynamo from sequences of polarity reversals

Fischer¹,

Gerbeth²,

Giesecke³

et al. 2009

Inverse Problems

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Abstract. The asymmetric time dependence and various statistical properties of polarity reversals of the Earth's magnetic field are utilized to infer some of the most essential parameters of the geodynamo, among them the effective (turbulent) magnetic diffusivity, the degree of supercriticality, and the relative strength of the periodic forcing which is believed to result from the Milankovic cycle of the Earth's orbit eccentricity. A time-stepped spherically symmetric α 2 -dynamo model is used as the kernel of an inverse problem solver in form of a downhill simplex method which converges to solutions that yield a stunning correspondence with paleomagnetic data.

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Section: The Functionals To Be Minimized and The Inversion Methodsmentioning

confidence: 97%

Inferring basic parameters of the geodynamo from sequences of polarity reversals

Fischer¹,

Gerbeth²,

Giesecke³

et al. 2009

Inverse Problems

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show abstract

“…The Devil's Staircase is a fractal property of complex dynamic systems and can be constructed from the Cantor set. The Devil's Staircase is commonly found in nature, including depositional sequences and the reversal of Earth's magnetic field (Bak, 1996;De Michelis & Consolini, 2003;Simkin & Roychowdhury, 2014;. A fractal property is scale invariant.…”

Section: Temporal Patterns Of Large Earthquakes: Devil's Staircasementioning

confidence: 99%

Spatiotemporal patterns of earthquakes and their implications for earthquake hazards

Chen¹

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[EMBARGOED UNTIL 5/1/2023] This work focuses on characterizing spatiotemporal patterns of earthquakes, their possible causes, and their implications for seismic hazard assessment. I studied both local and global earthquakes in the view of complex fault systems. Specifically, I studied the background seismicity and long-lived aftershock activities in intraplate North China and the Central and Eastern United State (CEUS), and characterized the correlation between strain rate and seismicity and evaluated the prediction power of strain rate in different tectonic settings. I found that periodic or quasiperiodic earthquake recurrence on individual faults, as predicted by the elastic rebound model, is not common in nature. Instead, most earthquake sequences are complex and variable, and often show clusters of events separated by long but irregular intervals of quiescence. The common earthquake clustering may be caused by earthquake-induced viscoelastic relaxation and fault interaction. Most earthquake sequences are burstier than the Poisson model, implying a higher probability of repeating events soon after a large earthquake. Possible long-lived aftershocks are found in intraplate North China and the CEUS. Background seismicity in intraplate regions may vary with time, highlighting the complexity of intraplate seismicity. Mistakenly identifying long-lived aftershocks as background earthquakes may overestimate seismic hazard in intraplate regions. The correlation between strain rate and seismicity varies between different tectonic settings and is time-dependent. Good strain rate-seismicity correlations are found in plate boundary regions and during seismically active periods, while no correlations are found in stable continents and during inactive periods. All these variations need to be considered in hazard assessment.

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A coupled low order dynamo/turbulent shell model for geomagnetic field variations and reversals

Ryan

Sarson

2011

Physics of the Earth and Planetary Interiors

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Some new approaches to the study of the Earth's magnetic field reversals

Cited by 3 publications

References 30 publications

Inferring basic parameters of the geodynamo from sequences of polarity reversals

Inferring basic parameters of the geodynamo from sequences of polarity reversals

Spatiotemporal patterns of earthquakes and their implications for earthquake hazards

A coupled low order dynamo/turbulent shell model for geomagnetic field variations and reversals

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