摘要
In view of the correlation between tectonic activity and seismicity,the strong earthquake risk in the North-South Seismic Belt aroused wide concern after the 2014 Yutian M_S7.3 earthquake. Using the seismic catalog of the China Earthquake Networks Center,the Benioff strain ratio in the North-South Seismic Belt is calculated in 30 days before and after the March 21,2008 and February 12,2014 Yutian M_S7.3 earthquakes. Results show that in a year after the 2008 Yutian M_S7.3 earthquake,M > 5. 0 earthquakes all occurred near the high strain ratio area or the junction between the low and high strain ratio areas,the activity of strong earthquakes obviously coincides with the high strain ratio area,which indicates that these areas have a higher stress level. The Yutian earthquakes promoted the release of small earthquakes in the high stress areas. This research is of certain indicating significance to the study of subsequent strong earthquakes of this region.
In view of the correlation between tectonic activity and seismicity, the strong earthquake risk in the North-South Seismic Belt aroused wide concern after the 2014 Yutian Ms7. 3 earthquake. Using the seismic catalog of the China Earthquake Networks Center, the Benioff strain ratio in the North-South Seismic Belt is calculated in 30 days before and after the March 21, 2008 and February 12, 2014 Yutian Ms7. 3 earthquakes. Results show that in a year after the 2008 Yutian Ms7. 3 earthquake, M 〉 5. 0 earthquakes all occurred near the high strain ratio area or the junction between the low and high strain ratio areas, the activity of strong earthquakes obviously coincides with the high strain ratio area, which indicates that these areas have a higher stress level. The Yutian earthquakes promoted the release of small earthquakes in the high stress areas. This research is of certain indicating significance to the study of subsequent strong earthquakes of this region.
基金
sponsored by the National Key Technology R&D Program for the 12~(th) "Five-year Plan" of China(2012BAK19B02-01)
