Seasonality Variability and Periodicities for Ultra-Deep Earthquakes Worldwide

• 作者: Anibal Azevedo Marilia Hagen
• 来源期刊: 地震研究(英文)
• 学科: 地球科学
• 关键词: SEASONS SUBDUCTION Zones Earthquakes PERIODICITY South HEMISPHERE
• 年，卷（期）: 2019,（1）
• 页码范围: 1-18
• 页数: 18页
• 分类号: P4

摘要

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.