Results 71 to 80 of about 182 (156)

Paleomagnetic study of the 30 ka Aira caldera-forming eruption and 60–45 ka Iwato pyroclastic flow deposits, southern Kyushu, Japan

Earth, Planets and Space
To constrain the age and duration of large-scale caldera-forming eruptions, we measured paleomagnetic directions of pyroclastic deposits from the 30 ka Aira caldera eruption sequence, and the 60–45 ka Iwato pyroclastic flow deposits around Aira caldera ...
Takeshi Hasegawa, Nobutatsu Mochizuki, Hidetoshi Shibuya, Ayumu Nishihara, Chie Kusu, Shohei Shibata, Makoto Okada, Kuniaki Nishiki, Yuki Sato   +8 more
doaj   +1 more source

Paleomagnetism of Young New Zealand Basalts and Longitudinal Distribution of Paleosecular Variation.

Journal of geomagnetism and geoelectricity, 1995
A paleosecular variation (PSV) study was carried out on monogenic basalt volcanoes of the northern part of North Island, New Zealand. A new method of calculating angular standard deviation (ASD) by fitting a combination of two Fisher distributions to the cumulative histogram of VGP data is presented, which avoids the necessity of applying an arbitrary ...
Shibuya, Hidetoshi, Cassidy, John, Smith, Ian E. M., Itaya, Tetsumaru   +3 more
openaire   +2 more sources

Archaeomagnetic Insights into Pre-Hispanic Mayan Lime Production: Chronological Framework and Evidence of an Apparent 500-Year Hiatus in the Yucatán Peninsula

Quaternary
The Yucatán Peninsula, a key region of the ancient Maya civilization, has long presented challenges in establishing absolute chronological frameworks for its cultural practices.
Jocelyne Martínez Landín, Avto Goguitchaichvili, Soledad Ortiz, Oscar de Lucio, Vadim A. Kravchinsky, Rubén Cejudo, Miguel Cervantes, Rafael García-Ruiz, Juan Morales, Francisco Bautista, Ángel Gongora Salas, Iliana Ancona Aragon, Wilberth Cruz Alvardo, Carlos Peraza Lope   +13 more
doaj   +1 more source

Detecting dipolarity of the geomagnetic field in the paleomagnetic record. [PDF]

Proc Natl Acad Sci U S A, 2023
Lhuillier F, Shcherbakov VP, Sycheva NK.
europepmc   +1 more source

New paleomagnetic results from Neogene to Quaternary volcanic rocks of north of the Lake Van, Eastern Turkey. [PDF]

Sci Rep, 2023
Kayın S, İşseven T.
europepmc   +1 more source

Paleosecular Variation in Field Directions Due to Randomly Varying Gauss Coefficients.

Journal of geomagnetism and geoelectricity, 1997
Expressions are derived for the magnetic field directions produced by randomly varying Gauss coefficients. This approach was pioneered by Constable and Parker (1988), and followed by Kono and Tanaka (1995) and Kono and Hiroi (1996). The present treatment is a sequel to the latter two.
openaire   +2 more sources

Morphology and Variation of Geomagnetic Field: Time-averaged Field and Paleosecular Variation

Journal of Geography (Chigaku Zasshi), 2005
Tadahiro HATAKEYAMA, Hidetoshi SHIBUYA
openaire   +3 more sources

Current progress in studies of secular and paleosecular variation of Earth's magnetic field

Eos, Transactions American Geophysical Union, 1988
The study of paleosecular variation (paleo‐SV) became a separate branch of paleomagnetism more than 2 decades ago, largely because of studies of cores from lake sediments and of archeomagnetism of baked artifacts. The great prize of these studies and of the allied studies of reversals and observatory records is a description of Earth's magnetic field ...
openaire   +1 more source

Paleomagnetism‐Based Chronology of Holocene Lava Flows at Mt Ruapehu, Aotearoa New Zealand

Geochemistry, Geophysics, Geosystems
Dating young lava flows is essential for understanding volcano's eruption frequency, yet challenging due to methodological limitations of commonly used dating techniques.
Pedro Doll, Gillian M. Turner, Ben M. Kennedy, Alexander R. L. Nichols, Annika Greve, Jim W. Cole, Shaun R. Eaves, Dougal B. Townsend, Graham S. Leonard, Chris E. Conway   +9 more
doaj   +1 more source

Palaeomagnetism of the Upper Miocene- Lower Pliocene lavas from the East Carpathians: contribution to the paleosecular variation of geomagnetic field. [PDF]

Sci Rep, 2016
Vişan M, Panaiotu CG, Necula C, Dumitru A.   +3 more
europepmc   +1 more source