Another Simple Test for the Presence of Multidomain Behavior During Paleointensity Experiments

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Alexander W. Tully, Greig A. Paterson
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Abstract

Paleointensity measurements are vital for understanding the deep Earth and the evolution of the geomagnetic field, however, they suffer from non-ideal behavior that compromises the fidelity of the results. In an attempt to screen for non-ideal behavior in paleointensity experiments, selection criteria are used. One such non-ideal behavior is partial thermoremanent magnetization tails, which in the IZZI protocol result in a zig-zagging pattern on an Arai plot. While checks for these tails can be performed, these are not routinely used in experiments. We set out a new framework with which to create, develop, and re-assess selection criteria before applying it to our proposed new selection statistic, Ziggie, which is specific to detecting zig-zagging behavior. In creating Ziggie, we have attempted to define a criterion that is able to objectively and robustly identify the target behavior, consistently provide a quantifiable assessment of the target behavior, and is predominately sensitive to the target behavior while being free of undue influences. Other pre-existing statistics identifying Arai plot zig-zag, Z*, IZZI_MD, β, and SCAT, are also tested, but fail to meet all requirements. When a criterion of Ziggie ≤ 0.1 is applied to real IZZI data we find an overall improvement in the results and suggest the adoption of this criterion in future IZZI analysis.

Abstract Image

古强度实验中存在多域行为的另一个简单测试
古强度测量对于了解地球深部和地磁场的演变是至关重要的,然而,它们受到非理想行为的影响,从而损害了结果的保真度。为了在古强度实验中筛选非理想行为,使用了选择标准。这种非理想行为之一是部分热磁化尾,在IZZI协议中,它会在Arai图上产生锯齿状图案。虽然可以对这些尾部进行检查,但这些在实验中并不经常使用。我们建立了一个新的框架,用来创建、发展和重新评估选择标准,然后将其应用于我们提出的新的选择统计,Ziggie,这是专门用于检测曲折行为的。在创建Ziggie的过程中,我们试图定义一个标准,该标准能够客观而有力地识别目标行为,始终如一地提供目标行为的可量化评估,并且在不受不当影响的情况下对目标行为非常敏感。其他已存在的识别Arai图之字形,Z*, IZZI_MD, β和SCAT的统计数据也进行了测试,但未能满足所有要求。当将Ziggie≤0.1的准则应用于实际IZZI数据时,我们发现结果总体上有所改善,并建议在未来的IZZI分析中采用该准则。
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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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