Distribution of apparent magnetization for Asia

Xu, Yingying; An, Zhenchang; Huang, Baochun; Golovkov, V. P.; Rotanova, N. M.; Kharitonov, A. L.

doi:10.1007/bf02879510

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The satellite LMF has been compared to the geology of China as early as the MAGSAT era. Magnetic anomaly maps were built and examined in relation to the geology and heat flux by An et al (1992), Xu (1997), Xu et al (2000), and Alsdorf and Nelson (1999). After the launch of CHAMP, Wang et al (2008) discussed the distribution of some new global LMF models.…”

Section: Introductionmentioning

confidence: 99%

Magnetic constraints on the spatial distribution of seismic activity

2013

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The lithospheric magnetic field (LMF) in China and its surrounding are calculated using the spherical harmonic coefficients given by the NGDC-720 model. The LMF comes from the magnetization of minerals in the crust and in the uppermost mantle. It may, therefore, provide unique insight into lithospheric tectonic processes and mechanisms. Here, we study the geomagnetic manifestation of active tectonic blocks, and find a close correlation between the LMF and seismicity. Many large faults are found to closely overlap with magnetic anomalies, or are distributed along the boundaries of magnetic anomalies. Earthquakes in these fault regions have occurred on the boundaries of magnetic anomalies, or in the transition zones between positive and negative anomalies. We analyze the components of the LMF, and the LMFs at different altitudes, finding that the vertical component, B z at 200 km, is the most related to seismic activity. Relevant physical mechanisms are also discussed. We propose that the stress or viscosity differences caused by temperature variations, which manifest in the LMF, may be the predominant reason for the correlation between the LMF and seismic activity along large faults.

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Section: Introductionmentioning

confidence: 99%

Magnetic constraints on the spatial distribution of seismic activity

2013

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“…The pre‐Devonian tectonic evolution of these Wuyi terranes is fascinating and complicated (e.g., Lin, Xing, Davis, Wu, et al, 2018; Lin, Xing, Davis, Yin, et al, 2018; Ren & Chen, 1989; Xu, Yang, et al, 2010; Xu & Zhang, 2013; Zhang et al, 2013; Zhao et al, 2019). The tectonic activity analysis of these micro‐terranes within the Wuyi terranes is a window to understand the tectonic framework and aggregation process for the Cathaysia Block since the Neoproterozoic (Lin, Xing, Davis, Wu, et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Records of Nanhua island arc activity between the north and south Wuyi terranes in the Cathaysia Block

et al. 2023

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The characteristics and pre‐Devonian tectonic evolution between the North and South Wuyi terranes are important for understanding the tectonic framework and aggregation of the micro‐terrenes in the Cathaysia Block, as well as the evolution of the South China Block. This paper provides systematic studies on the petrologic features, zircon U–Pb geochronology and geochemical characteristics of the low‐grade meta‐volcanic and metasedimentary rocks between the North and South Wuyi terranes, and proposes an alternative model for their tectonic evolution. Geochronological data show that the metasedimentary rocks have detrital zircon U–Pb ages ranging from 583 to 3284 Ma with a record of the Nanhua period (764–722 Ma). The meta‐volcanic rocks have centralized ages ranging from 720 to 760 Ma and yield weighted average ages of 746–733 Ma. Geochemical studies of the meta‐volcanic rocks show similar characteristics to island arc magmatic rocks, with relatively high SiO2, K2O and Al2O3, low TFeO and MgO contents, and enrichment of Rb, Ba, Th, Pb and Hf elements, and depletion in Ti, Nb, Sr and Ta. These features indicate that the North and South Wuyi terranes may have collided at about 746–733 Ma and eventually pieced together at 583 Ma, with the protoliths of the meta‐volcanic rocks and the metasedimentary rocks formed in the same tectonic setting of an island arc during Nanhua island arc magmatism related to the collision. The occurrence of Nanhua island arc activity between the North and South Wuyi terranes suggests that multi‐micro‐terranes and multi‐stage collisions may be major characteristics of the tectonic evolution process in the Cathaysia Block.

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“…As early as the MAG-SAT era, An et al (1992) studied the magnetic anomaly of China and its adjacent region with spherical cap harmonic analysis. Xu (1997) and Xu et al (2000) calculated the apparent magnetization of Mainland China and compared it with geology and heat flux. Alsdorf and Nelson (1999) hypothesized that the negative Fig.…”

Section: Introductionmentioning

confidence: 99%

Possible correlation between the vertical component of lithospheric magnetic field and continental seismicity

Lei

Jiao

Chen

2018

Earth Planets Space

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Recent magnetic satellite missions facilitate new birth of large-scale geomagnetic field models and their applications to tectonics. Here, we directly compare the global geomagnetic field models NGDC-720 with the tectonics and seismicity in Mainland China and surroundings. It is found that the tectonics and seismicity in this area show remarkable correlation with the vertical component of lithospheric magnetic field (B z) calculated at an altitude of 200 km. Previous thought was that earthquakes are more likely to occur in zero B z belts or in obvious anomaly gradient belts. On the contrary, we find that more than half (53.2%) of the earthquakes occurred in areas with B z of − 5 to − 3 nT or in areas with a relatively small horizontal gradient of B z in the same time interval with the satellite data. The percentage seismic energy in these areas (− 5 nT < B z < − 3 nT) is even as high as 94.6%. We explain this unexpected result with a two equivalent source dipole model, arguing that the viscosity difference caused by the temperature gradient within the lithosphere likely accounts for the correlation between magnetic anomalies and seismicity.

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Distribution of apparent magnetization for Asia

Cited by 5 publications

References 6 publications

Magnetic constraints on the spatial distribution of seismic activity

Magnetic constraints on the spatial distribution of seismic activity

Records of Nanhua island arc activity between the north and south Wuyi terranes in the Cathaysia Block

Possible correlation between the vertical component of lithospheric magnetic field and continental seismicity

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