scholarly journals Geomagnetic Anomaly Distribution of Iwo-zima

1985 ◽  
Vol 94 (6) ◽  
pp. 502-515 ◽  
Author(s):  
Shoichi OSHIMA ◽  
Toshiro KANEKO ◽  
Ken-ei ONODERA ◽  
Hisaho NAKAGAWA ◽  
Takashi TOZAKI ◽  
...  
Keyword(s):  
Geomagnetic Anomaly

Particle precipitation in Brazilian geomagnetic anomaly during magnetic storms

1973 ◽  
Vol 21 (10) ◽  
pp. 1699-1704 ◽  
Author(s):  
N.B. Trivedi ◽  
D.B. Rai ◽  
I.M. Martin ◽  
J.M. Da Costa
Keyword(s):  
Magnetic Storms ◽  
Particle Precipitation ◽  
Geomagnetic Anomaly

scholarly journals Geomagnetic anomaly associated with Fukushima earthquake on February 13th, 2021

2021 ◽  
Vol 331 ◽  
pp. 07012
Author(s):  
Cipta Ramadhani ◽  
Bulkis Kanata ◽  
Abdullah Zainuddin ◽  
Rosmaliati ◽  
Teti Zubaidah
Keyword(s):  
Data Processing ◽  
Geomagnetic Field ◽  
Field Data ◽  
Low Frequency ◽  
Earthquake Precursors ◽  
Polarization Ratio ◽  
Magnetic Polarization ◽  
Central Frequency ◽  
Electromagnetic Data ◽  
Geomagnetic Anomaly

In this study, we performed research on electromagnetic anomalies related to earthquakes as early signs (precursors) that occurred in Fukushima, Japan on February 13th, 2021. The research focused on the utilization of geomagnetic field data which was derived from the Kakioka (KAK), Kanoya (KNY), and Memambetsu (MMB) observatories, particularly in the ultra-low frequency (ULF) to detect earthquake precursors. The method of electromagnetic data processing was conducted by applying a polarization ratio. In addition, we improved the methodology by splitting the ULF data (which ranged from 0.01-0.1 Hz) into 9 central frequencies and picking up the highest value from each central frequency to get the polarization ratio. The anomaly of magnetic polarization was identified 2-3 weeks before the mainshock in a narrowband frequency in the range of 0.04-0.05 Hz.

Cooperative Studies on the South Atlantic Geomagnetic Anomaly under Collaboration of UFSM, INPE and NIPR, Japan

1997 ◽  
Author(s):  
N.J. Schuch ◽  
S.F. Adaime ◽  
N.U.V. Oliveira ◽  
E. Bortolotto ◽  
P.J. Sarkis ◽  
...  
Keyword(s):  
South Atlantic ◽  
The South ◽  
Geomagnetic Anomaly

Upper Atmospheric Observations in the Brazilian Geomagnetic Anomaly Region

1997 ◽  
Author(s):  
T. Kikuchi ◽  
K. Makita ◽  
S. Okano ◽  
N. Schuch ◽  
H. Takahashi
Keyword(s):  
Atmospheric Observations ◽  
Geomagnetic Anomaly ◽  
Anomaly Region

scholarly journals Energetic particle precipitation in the Brazilian geomagnetic anomaly during the “Bastille Day storm” of July 2000

2006 ◽  
Vol 58 (5) ◽  
pp. 607-616 ◽  
Author(s):  
Masanori Nishino ◽  
Kazuo Makita ◽  
Kiyofumi Yumoto ◽  
Yoshizumi Miyoshi ◽  
Nelson J. Schuch ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Particle Precipitation ◽  
Energetic Particle Precipitation ◽  
Geomagnetic Anomaly

Tectonic evolution and trace element composition of basement rocks of the Mid-Atlantic Ridge: 8° S

1971 ◽  
Vol 268 (1192) ◽  
pp. 661-661
Keyword(s):  
Tectonic Evolution ◽  
Regional Metamorphism ◽  
Trace Element Composition ◽  
Element Composition ◽  
Laboratory Measurements ◽  
Refraction Seismology ◽  
Basement Rocks ◽  
Mid Atlantic Ridge ◽  
Temperature And Pressure ◽  
Geomagnetic Anomaly

Rapidly growing information regarding the rocks of the Mid-Atlantic Ridge has led Melson & Thompson to postulate a basement consisting of an upper layer of oceanic tholeiites with subsidiary hydrothermal metabasalts, and a lower plutonic layer of peridotites, serpentinites and gabbros. These layers may correspond to the second and third layers of refraction seismology. The same data permit the assumption that the oceanic tholeiites are underlain by an intermediate layer of metabasalts resulting from iso-chemical regional metamorphism under increased temperature and pressure. Laboratory measurements of magnetic properties have shown that the Koningsberger ratio of oceanic metabasalts is generally less than unity. Thus, such a regional metamorphic layer would place a floor under the zone responsible for the observed geomagnetic anomaly patterns.

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