scholarly journals The relationship between the magnitude and direction of the geomagnetic field during the Late Tertiary in Eastern Iceland

1984 ◽  
Vol 76 (3) ◽  
pp. 637-651 ◽  
Author(s):  
Neil Roberts ◽  
John Shaw
Keyword(s):  
Geomagnetic Field ◽  
Late Tertiary ◽  
The Relationship

scholarly journals Statistical issues about solar–climate relations

2010 ◽  
Vol 6 (5) ◽  
pp. 565-573 ◽  
Author(s):  
P. Yiou ◽  
E. Bard ◽  
P. Dandin ◽  
B. Legras ◽  
P. Naveau ◽  
...  
Keyword(s):  
Time Series ◽  
Solar Activity ◽  
Geomagnetic Field ◽  
Degrees Of Freedom ◽  
Statistical Significance ◽  
Data Sets ◽  
Statistical Issues ◽  
The Relationship ◽  
Temperature Time ◽  
Field Variability

Abstract. The relationship between solar activity and temperature variation is a frequently discussed issue in climatology. This relationships is usually hypothesized on the basis of statistical analyses of temperature time series and time series related to solar activity. Recent studies (Le Mouël et al., 2008, 2009; Courtillot et al., 2010) focus on the variabilities of temperature and solar activity records to identify their relationships. We discuss the meaning of such analyses and propose a general framework to test the statistical significance for these variability-based analyses. This approach is illustrated using European temperature data sets and geomagnetic field variations. We show that tests for significant correlation between observed temperature variability and geomagnetic field variability is hindered by a low number of degrees of freedom introduced by excessively smoothing the variability-based statistics.

The relationship between 10Be and geomagnetic field strength records in central North Atlantic sediments during the last 80 ka

1995 ◽  
Vol 136 (3-4) ◽  
pp. 551-557 ◽  
Author(s):  
Christian Robinson ◽  
Grant M. Raisbeck ◽  
Françoise Yiou ◽  
Benoiˆt Lehman ◽  
Carlo Laj
Keyword(s):  
Field Strength ◽  
North Atlantic ◽  
Geomagnetic Field ◽  
The Relationship ◽  
Geomagnetic Field Strength

Evidence of Paleogene sedimentation on Graham Island, Queen Charlotte Islands, west coast, Canada

1990 ◽  
Vol 27 (4) ◽  
pp. 533-538 ◽  
Author(s):  
James M. White
Keyword(s):  
West Coast ◽  
Early Eocene ◽  
Thermal Maturity ◽  
Queen Charlotte Islands ◽  
Early Oligocene ◽  
Late Tertiary ◽  
Age Range ◽  
Relationship Of ◽  
The Relationship ◽  
Sedimentary Unit

The palynomorph taxa Ctenosporites eskerensis, Pesavis tagluensis, and Tilia spp. demonstrate that an unnamed sedimentary unit in the Union Port Louis well and float from Mud Bay Creek, Skidegate Inlet, British Columbia, most likely fall in the age range Early Eocene to Early Oligocene. These two localities, 66 km apart, have yielded the oldest Tertiary sediments yet confirmed on the Queen Charlotte Islands or in the Queen Charlotte Basin. The sediments are apparently continental. They exhibit high thermal maturity, which may be due to local volcanism, plutonism, or regional subsidence. The relationship of the Paleogene sediments to the late Tertiary Skonun Formation has not been determined.

Paleomagnetism of Quaternary and late Tertiary sediments on Mokowan Butte, southwestern Alberta

1991 ◽  
Vol 28 (12) ◽  
pp. 1956-1964 ◽  
Author(s):  
R. W. Barendregt ◽  
E. Irving ◽  
E. T. Karlstrom
Keyword(s):  
British Columbia ◽  
Geomagnetic Field ◽  
Early Pleistocene ◽  
Glacial Sediments ◽  
Banks Island ◽  
Quaternary Sequences ◽  
Matuyama Chron ◽  
Late Tertiary ◽  
Unconsolidated Sediment ◽  
Accurate Record

Mokowan Butte in southwestern Alberta is capped by 32 m of unconsolidated sediment comprising five tills and their associated paleosols. Previous stratigraphic work has indicated that the older tills are probably Early Pleistocene to late Tertiary in age. Paleomagnetic studies, based on 125 samples, show that the uppermost till–paleosol unit and the modern subsoil are normally magnetized, whereas the till–paleosol units from the middle of the sequence have reversed magnetization. We argue that these belong to the Brunhes and Matuyama polarity zones, respectively. The lowest part of the sequence has not been studied in detail and is generally too coarse for paleomagnetic sampling, and samples that have been obtained contain no accurate record of the paleofield. These new data, together with those from Wellsch Valley in Saskatchewan, Banks Island in the Northwest Territories, Fort Selkirk in the Yukon, and Merritt in British Columbia, bring to five the number of early Quaternary sequences in Canada that have yielded a record of glacial sediments deposited during the Matuyama chron, and hence record glacial events prior to the last reversal of the geomagnetic field (720 ka).

scholarly journals A statistical analysis of the relationship between Pc4 and Pc5 ULF waves, solar winds and geomagnetic storms for predicting earthquake precursor signatures in low latitude regions

2021 ◽  
Vol 880 (1) ◽  
pp. 012010
Author(s):  
S N A Syed Zafar ◽  
Roslan Umar ◽  
N H Sabri ◽  
M H Jusoh ◽  
A Yoshikawa ◽  
...  
Keyword(s):  
Solar Wind ◽  
Geomagnetic Field ◽  
Geomagnetic Storms ◽  
Earthquake Precursor ◽  
Ulf Waves ◽  
Low Latitude ◽  
Geomagnetic Indices ◽  
Solar Winds ◽  
Solar Wind Parameters ◽  
The Relationship

Abstract Short-term earthquake forecasting is impossible due to the seismometer’s limited sensitivity in detecting the generation of micro-fractures prior to an earthquake. Therefore, there is a strong desire for a non-seismological approach, and one of the most established methods is geomagnetic disturbance observation. Previous research shows that disturbances in the ground geomagnetic field serves as a potential precursor for earthquake studies. It was discovered that electromagnetic waves (EM) in the Ultra-Low Frequency (ULF) range are a promising tool for studying the seismomagnetic effect of earthquake precursors. This study used a multiple regression approach to analyse the preliminary study on the relationship between Pc4 (6.7-22 mHz) and Pc5 (1.7-6.7 mHz) ULF magnetic pulsations, solar wind parameters and geomagnetic indices for predicting earthquake precursor signatures in low latitude regions. The ground geomagnetic field was collected from Davao station (7.00° N, 125.40° E), in the Philippines, which experiences nearby earthquake events (Magnitude <5.0, depth <100 km and epicentre distance from magnetometer station <100 km). The Pc5 ULF waves show the highest variance with four solar wind parameters, namely SWS, SWP, IMF-Bz, SIE and geomagnetic indices (SYM/H) prior to an earthquake event based on the regression model value of R2 = 0.1510. Furthermore, the IMF-Bz, SWS, SWP, SWE, and SYM/H were found to be significantly correlated with Pc5 ULF geomagnetic pulsation. This Pc5 ULF magnetic pulsation behaviour in solar winds and geomagnetic storms establishes the possibility of using Pc5 to predict earthquakes.

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