Statistical Analysis of Palaeomagnetic Data from the Last Four Centuries: Evidence of Systematic Inclination Shallowing in Lava Flow Records

• DOI: 10.1007/s00024-014-0946-0
• Publication Date: 2014-10-17T12:40:30Z
• Authors: F. J. Pavón-Carrasco; E. Tema; M. L. Osete; R. Lanza
• Keywords: Volcanic data; Inclination shallowing, Palaeomagnetism, Volcanic data, Archaeomagnetic data, Geomagnetic field models.; Geomagnetic field models; Palaeomagnetism; Inclination shallowing; 01 natural sciences; Archaeomagnetic data; 0105 earth and related environmental sciences

The main objective of this work is to compare directional (declination and inclination) volcanic and archaeomagnetic data for the last four centuries (~1600–1990) with the historical geomagnetic predictions given by the GUFM1 model which spans from 1590 to 1990. The results show statistical agreement between archaeomagnetic data and directions given by the geomagnetic field model. However, when comparing the volcanic data with the model predictions, marked inclination shallowing is observed. This systematically lower inclination has already been observed in local palaeomagnetic studies (Italy, Mexico and Hawaii) for the 20th century, by comparing recent lava flows with the International Reference Geomagnetic Field (IGRF) model. Here, we show how this inclination shallowing is statistically present at worldwide scale for the last 400 years with mean inclination deviation around 3° lower than the historical geomagnetic field model predictions. They are also grateful to the Spanish research project CGL2011-24790. F.J. Pavón-Carrasco thanks ME-Fulbright contract CT-2010-0663 at the Spanish Institution FECYT. Peer reviewed