Geomagnetic intensity as evaluated from ancient Chinese pottery

Nature ◽  
1987 ◽  
Vol 328 (6128) ◽  
pp. 330-333 ◽  
Author(s):  
Wei Quing-Yun ◽  
Zhang Wei-Xi ◽  
Li Dong-Jie ◽  
M. J. Aitken ◽  
G. D. Busseil ◽  
...  
Keyword(s):  
Geomagnetic Intensity

Analysis of 11 Myr of geomagnetic intensity variation

1998 ◽  
Vol 103 (B8) ◽  
pp. 17735-17748 ◽  
Author(s):  
Catherine G. Constable ◽  
Lisa Tauxe ◽  
Robert L. Parker
Keyword(s):  
Intensity Variation ◽  
Geomagnetic Intensity

scholarly journals A tectonomagnetic effect detected in Central Italy

1994 ◽  
Vol 37 (1) ◽  
Author(s):  
G. Mele ◽  
A. Meloni ◽  
P. Palangio
Keyword(s):  
Field Intensity ◽  
Geomagnetic Field ◽  
Central Italy ◽  
Volcanic Eruptions ◽  
Intensity Data ◽  
Absolute Level ◽  
Tectonic Events ◽  
Railway System ◽  
The Absolute ◽  
Geomagnetic Intensity

Significant variations in the absolute value of the geomagnetic field intensity related to tectonic events, as earthquakes and volcanic eruptions, have been observed in several cases. To detect such a tectonomagnetic effect related to seismic activity, a seismomagnetic network was installed by the Istituto Nazionale di Geofisica (ING) in the Abruzzi region (CentraI Italy), in July 1989. This area is being uplifting since the Pliocene. A logistic compromise between geophysical requirements and the electrified railway system tracks distribution led to the installation of five total magnetic field intensity data acquisition sites. From July 1989 to September 1992 geomagnetic intensity data were simultaneously recorded at all stations and compared to that recorded at the L'Aquila Observatory, located in the same area. A variation of about 10 nT in the absolute level of the geomagnetic field was measured at two stations located on the eastern side of the network. We suggest that the detected magnetic anomaly could resuIt from aseismic-changes in crustal stress during this time.

Analysis of Magnetic Anomaly Characteristics of Underground Non-Coplanar Cross-buried Iron Pipelines

2020 ◽  
Vol 25 (2) ◽  
pp. 223-233
Author(s):  
Pan Wu ◽  
Minghui Wei
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Anomaly ◽  
Magnetic Dipole ◽  
Geomagnetic Field ◽  
Magnetic Anomalies ◽  
Buried Pipelines ◽  
Magnetic Declination ◽  
Magnetic Inclination ◽  
Basic Characteristics ◽  
Geomagnetic Intensity

The non-coplanar cross-buried pipelines are a common way of pipeline wiring. In order to investigate the magnetic anomaly characteristics of the non-coplanar cross-buried pipelines and guide the site operation, the influences of a series of factors on the magnetic anomaly of the non-coplanar cross-buried pipelines are analyzed. Based on the principle of magnetic dipole construction, a forward model is established for the magnetic anomaly characteristics of the subsurface non-coplanar cross-buried pipelines. The basic characteristics of magnetic anomaly for the non-coplanar cross-buried pipelines are defined. The influences of geomagnetic parameters (geomagnetic intensity, geomagnetic inclination, and geomagnetic declination), pipeline parameters (thickness, magnetic susceptibility), and cross angle of pipelines on the characteristics of magnetic anomalies are analyzed. The results show that the shape of the total magnetic anomaly is mainly affected by the magnetic inclination, and the curve of magnetic anomaly at ± I site shows some symmetry. The amplitude is approximately linearly affected by the total geomagnetic field, magnetic declination, pipeline thickness, material magnetic susceptibility, and pipeline cross angle. There is a periodic change of the amplitude with the increase of geomagnetic inclination (−90°–>90°). The crest-trough distance is mainly affected by geomagnetic inclination, magnetic declination, thickness, magnetic susceptibility, and pipeline cross angle. A more accurate measurement can be achieved if the direction of the pipelines is roughly measured and then the number of measurement points is augmented near the intersection of pipelines and the measurement lines. Present work obtains the equivalent magnetic dipole units by segmenting pipelines. The magnetic anomaly characteristics of non-coplanar crossed iron pipelines are successfully simulated. The numerical results are in accordance with the experimental analysis.

ARCHAEOMAGNETIC DETERMINATION OF THE PAST GEOMAGNETIC INTENSITY USING ANCIENT CERAMICS: ALLOWANCE FOR ANISOTROPY

Archaeometry ◽  
1981 ◽  
Vol 23 (1) ◽  
pp. 53-64 ◽  
Author(s):  
M. J. AITKEN ◽  
P. A. ALCOCK ◽  
G. D. BUSSELL ◽  
C. J. SHAW
Keyword(s):  
Ancient Ceramics ◽  
The Past ◽  
Geomagnetic Intensity

Geomagnetic intensity spike recorded in high resolution slag deposit in Southern Jordan

2009 ◽  
Vol 287 (3-4) ◽  
pp. 529-539 ◽  
Author(s):  
Erez Ben-Yosef ◽  
Lisa Tauxe ◽  
Thomas E. Levy ◽  
Ron Shaar ◽  
Hagai Ron ◽  
...  
Keyword(s):  
High Resolution ◽  
Geomagnetic Intensity

scholarly journals Reconstruction of 130-kyr Relative Geomagnetic Intensities from 10Be in Two Chinese Loess Sections

Radiocarbon ◽  
2010 ◽  
Vol 52 (1) ◽  
pp. 129-147 ◽  
Author(s):  
Weijian Zhou ◽  
Feng Xian ◽  
J Warren Beck ◽  
A J Timothy Jull ◽  
Zhisheng An ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Potential Application ◽  
Chinese Loess ◽  
Geomagnetic Excursion ◽  
The Past ◽  
Mis 3 ◽  
Good Agreement ◽  
Geomagnetic Intensity

Efforts to extract weak geomagnetic excursion signals from Chinese loess-paleosol 10Be have generally been unsuccessful due to the complexities of its accumulation, because the geomagnetic and climate (precipitation and dust) signals contained in loess-paleosol sequence are tightly overprinted. Here, we present a reconstruction of geomagnetic relative paleointensities for the past 130 kyr from 10Be records in 2 Chinese loess-paleosol sections using a correction based on the correlation of 10Be with magnetic susceptibility (SUS) to remove the climatic contamination. Both these records reveal the Laschamp and Blake events, which lie in the loess and paleosol (L1SS1 and S1SS3) horizons corresponding to mid-MIS 3 and 5e, respectively. The good agreement between our results and other geomagnetic intensities reconstructions from Atlantic and Pacific sediments indicates that our method is robust. Our study suggests the potential application of loess-paleosol 10Be for reconstructing geomagnetic intensity variations spanning the whole Quaternary.

Sign in / Sign up

Export Citation Format

Share Document