TITLE:
Seasonality Variability and Periodicities for Ultra-Deep Earthquakes Worldwide
AUTHORS:
Marilia Hagen, Anibal Azevedo
KEYWORDS:
Seasons, Subduction Zones, Earthquakes, Periodicity, South Hemisphere
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.8 No.1,
December
28,
2018
ABSTRACT: Our last study found that deepest-depth earthquakes with larger magnitudes
(M6 or above) showed seasonality, which is dependent on the area searched.
The main results indicated strong evidence that the causes for the delays in
enhancements along the period investigated were due to the tectonics also,
not only the season. Therefore, if the inquiry was about an area in Northern
Hemisphere, the season in which the increases occurred is different than the
season in the Southern Hemisphere. Also, higher latitudes in the Northern
Hemisphere or around the Equator, displayed seasonality similarly where the
tremors appear to increase during the Spring and Summer. This did not happen
to the Southern Hemisphere where disturbances and anomalies occurred
without showing much connection to the seasons in the analyzed period.
However, some of the regions presented periodicities independent from the
seasons.