Association of Seismic Activity with Solar Cycle and Geomagnetic Activity

Tamara Gulyaeva

《Development in Earth Science》 2卷 (2014/12) Pp. 14-19

並列摘要

The long-term relationship is investigated between the occurrence of earthquakes with magnitude from 5.0 to 10.0 (M5+), the solar cycle and geomagnetic activity for a period from 1964 to 2013. It is found that the global number of earthquakes tends to grow towards the solar cycle minimum characterized by the sunspot number, SSN, and solar radio flux F10.7. The trend of anti-correlation between the global earthquake occurrence and the phase of the solar cycle is expressed analytically in terms of SSN and F10.7 and applied for prediction of earthquakes number, EQN, based on SSN prediction. The occurrence of EQN in the South magnetic hemisphere relative to that in the North hemisphere is about 1.5 times greater the both irrespective of season. It is shown that zones of enhanced seismic activity are located in the Pacific Ocean at longitudes between 120° to 210°E and magnetic latitudes from 40°S to 40°N with dominant earthquake occurrence in the sub-equatorial region of the South hemisphere. Taking advantage of monitoring the equatorial ring current variations with geomagnetic disturbance storm time Dst index, relevant catalogue of 1305 geomagnetic Dst storms during 1964-2013 is produced and compared with seismic activity. It is found that 13% of earthquakes M5+ occur during Dst storm times showing an enhanced seismic activity at the growing branch of phase of the solar cycle which is permanent feature of the geomagnetic activity.

並列關鍵字

Earthquake ； Seismology ； Solar Activity ； Geomagnetic Storm