Abstract
The problem of the correlation of the global dynamic phenomenon “Chandler wobble” with the local dynamics in different parts of the Earth’s crust and lithosphere is wide of the solution. In this study, an attempt was made to approach the solution by analyzing the temporal variations of local seismic activity in the restricted geospace volumes (GSV) within the uniform seismoactive regions. The driver of Chandler wobble is the deep mantle – the most hard and most massive Earth’s layer, whose large inertia tensor value is able to keep up Chandler’s specific rotation of the Earth for a long time. We use the geocentric coordinate system where daily rotation is absent. In this system Chandler wobble is very slow rotation of the Earth around the current equatorial axis (the pole of which is denoted as EP14). Probably, this slow rotation can influence on the seismic events in the GSV. This influence is proposed to determine by the some statistical parameter EP14gsv that indicates the most typical position EP14 on equator when the most part of the earthquakes have occurred in the given GSV. For some geospace volumes the distribution indicates certain longitudes, where the number of seismic events is maximal or minimal.
Highlights
The Polar Motion (PM) is a complex phenomenon
We study the question: if there is an influence of the Chandler Wobble on the weak and medium local seismic activity in the restricted geospace volumes within the uniform seismoactive regions, and what is the mechanics of this influence
We investigated the effect of the Chandler Wobble on seismicity in the different geospace volumes (GSV) over the globe, but the most noticeable and interesting results were revealed for GSV within uniform seismoactive regions
Summary
The Polar Motion (PM) is a complex phenomenon. It is influenced by many factors and it contains many components. It is believed that the atmosphere provokes a deviation of the axis of rotation of the Earth from the axis of its greatest moment of inertia, which leads to free nutation with a period of 14 months [3]. The effect would be a step-function shift in the secular pole and nearly an equal and opposite change in the pole path, producing a second-order discontinuity in the pole path [10] In this model the pole would proceed at a uniform rate along a circular arc centered at the secular pole until the exact time of the earthquake. It can be assumed that the moment of the earthquake, when an already stressed state in the future earthquake source zone has formed, is under “trigger” influence of relatively weak variable in time forces that are not related to tectonics. We study the question: if there is an influence of the Chandler Wobble on the weak and medium local seismic activity in the restricted geospace volumes within the uniform seismoactive regions, and what is the mechanics of this influence
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