arXiv subjects

S. A. Merkuryev

Publications and source records attributed to S. A. Merkuryev.

3 recordsLinked to original sources

arXiv2023

Instantaneous Pole Velocity and Global Models

A new approach to estimating the velocity of the pole moving is considered. The method uses the model-calculated spatial distribution of the (vector) horizontal component \textbf{H} for a given year and its change relative to the closest epochs. The velocity equation is obtained from the expression for the time dependence of the position of the pole $\mathbf{H}(λ(t),ϕ(t),t)=0$. Here $λ(t)$ and $ϕ(t)$ are the geographic coordinates of the pole at time $t$. The velocity between epochs can be found using the Hermite spline, which gives a smooth line that keeps the velocity vector in each epoch. We use IGRF and COV-OBSx2 models to find the horizontal component.

physics.geo-ph↗

arXiv2016

Some remarks on resolving and interpretation of the short marine magnetic anomalies

Marine magnetic anomalies of the tiny wiggles (TW) type can be used to solve geohistorical and paleomagnetic problems. The model fields corresponding to Paleocene-Eocene anomalies in the northwestern Indian Ocean, which were formed during the fasts preading stage, were studied. For these fields, widely used interpretation methods were compared. The testing was performed with first the classical block model and then more complex models reflecting actual processes of oceanic accretion and magnetic field variations in the past. Spectral and statistical methods are used to estimate the magnetic anomalies(MA) resolving. Preprocessing of a set profiles based on the maximal correlation is considered.

physics.geo-ph↗

arXiv2013

Cramer-Rao bound in detection of reversals

We use the Cramer-Rao bound to show which short magnetic reversals can be recovered successfully from a magnetic anomaly profile. Using a simple variant of the Vine-Matthews model, we show, in particular, that errors in determining the duration of a short subchron are much smaller than errors in localizing the center of the subchron.

physics.geo-ph↗