TITLE:
Possible Connections between Seasons and Ultra-Deep Earthquakes Worldwide
AUTHORS:
Marilia Hagen, A. Azevedo
KEYWORDS:
Sun, Moon, Earth, Ultra-Deep Quakes, Seasons
JOURNAL NAME:
Natural Science,
Vol.10 No.7,
July
30,
2018
ABSTRACT: The
aim of this investigation is to find possible changes in ultra-deep earthquakes
(UDQ) during different seasons of the year. In the acquisition of data for our
previous work we observed an inexplicable pattern of growth of ultra-deep
tremors (UDQ) during the studied period. Apparently, there is no viable
explanation for growth occurring at such a level, presumably in the
asthenosphere. Current research and theories developed for the inner layers of
the Earth do not explain such variations. Therefore, a possible explanation
would be in external factors such as the seasons of the year, which are
determined by changes in the Earth’s axial tilt, and therefore the portion of
the earth that is angled toward the sun. This paper focuses exclusively on UDQ
events. To simplify the calculations, we consider four main locations; this
includes one more region than our previous paper but includes only UDQ data.
The results showed that during spring and autumn UDQ events grew slightly in
both Northern and Southern Hemispheres. It is also suggested that a contributor
to UDQ events is friction from the subducting lithosphere against the
continental plates.