Magnetic reversals and mass extinctions

  title={Magnetic reversals and mass extinctions},
  author={David M. Raup},
  • D. Raup
  • Published 28 March 1985
  • Physics
  • Nature
Previous analyses of the time distribution of reversals of the Earth's magnetic field have yielded mixed results. Some authors have claimed significant periodicities of order 107 yr1,2 whereas others have reported failure to reject null hypotheses of random spacing at that scale3–6. Because of repeated suggestions that field reversal is linked to biological extinction7–12, further analysis of the magnetic time series is appropriate. I present here the results of a study of the reversal record… 

Periodicity of the Earth's magnetic reversals

Reversals of the Earth's magnetic field may occur with a certain regularity. Using observed percentages of normal and reversed polarity during different time intervals, Negi and Tiwari1 detected

Do slow orbital periodicities appear in the record of Earth's magnetic reversals?

Time-series spectral analysis has been performed on the dates of geomagnetic reversals of the last 20 Myr BP and earlier. Possible evidence is found from the presence of high spectral peaks for two

The magnetic reversal record is not periodic

There is no compelling evidence for periodicity in the reversal record and the results of essentially identical analyses that have been applied to other geolocial data should be re-evaluated.

Secular variation and the origin of geomagnetic field reversals

Although there has been growing interest in suggestions that geomagnetic reversals may be initiated by external sources, we show that the present evidence favors a mechanism of internal origin for at

A model for the geomagnetic field reversal rate and constraints on the heat flux variations at the core-mantle boundary

Data of geomagnetic reversal rates are investigated and it is shown that the transition towards periods where reversals do not occur for tens of million years can be described by a second-order phase transition that is interpreted to be driven by variations of the heat flux at the core-mantle boundary (CMB).

Magnetic Polarity Time Scales and Reversal Frequency

The interpretation of oceanic magnetic anomaly sequences provides the longest continuous record of geomagnetic polarity available for analysis of reversal frequency. The polarity sequence since the

Mantle plumes and the periodicity of magnetic field reversals

Many geological phenomena show long term cyclical behavior. Of particular interest are mass extinctions and geomagnetic-field reversals, which may have correlated periodicities of approximately 30

Are cratering and probably related geological records periodic?

The controversial topic of periodicity in geological records in relation to astronomical modeling is reviewed. Although impact cratering, frequency distribution of geo-magnetic reversals, and mass

On rates of occurrence of geomagnetic reversals




15-Myr periodicity in the frequency of geomagnetic reversals since 100 Myr

The statistical properties of the magnetic polarity time scale have been examined recently1,2 for several time scales. For some of these scales the time evolution of the frequency of reversals as

Faunal Extinctions and Reversals of the Earth's Magnetic Field

A study of 28 deep-sea piston cores from high and low latitudes shows that during the last 2.5 m.y. eight species of Radiolaria became extinct. Prior to their extinction these species were widely

Relationship between biological extinctions and geomagnetic reversals

It has been repeatedly suggested that reversals of Earth9s magnetic field play a controlling role in evolution. Empirical evidence put forward to support this hypothesis has come from comparisons of

Lower mantle convection and geomagnetism

The statistical properties of recent marine magnetic anomaly time scales, covering the period from 165 Ma to the present, are analyzed via the methods presented in the companion paper (McFadden, this

Matching long term periodicities of geomagnetic reversals and galactic motions of the solar system

To understand the phenomenon of frequent reversals of axial geocentric dipole fields it is essential to understand the spectral structure of geomagnetic reversal series and search for possible

Spectral Analysis of Geomagnetic Reversal Time Scales

(Received 1975 November 17; in original form 1975 July 18) Summary Power spectra of binary telegraph waves corresponding to observed geomagnetic polarity histories are compared to the theoretical

Periodicity of extinctions in the geologic past.

  • D. RaupJ. Sepkoski
  • Geography, Environmental Science
    Proceedings of the National Academy of Sciences of the United States of America
  • 1984
The temporal distribution of the major extinctions over the past 250 million years has been investigated statistically using various forms of time series analysis and contains 12 extinction events that show a statistically significant periodicity.

Possible Direct Causal Relation Between Geomagnetic Reversals and Biological Extinctions

Although there are good correlations observed between magnetic reversals and biological extinctions, the radiation dosage hypothesis is insufficient to explain the agreement. In particular, the

Terrestrial mass extinctions, cometary impacts and the Sun's motion perpendicular to the galactic plane

Episodes of mass extinctions on the Earth are now strongly suspected to be cyclical1. We report here that our analysis of the data of Raup and Sepkoski1 suggests that the dominant cyclicity in major