The Dynamic Triggering Of Strong Earthquakes In Xinjiang And Adjacent Areas In Recent Years

The dynamic stress triggering is the seismic event in the high-stress zones,which is caused by earthquake wave by the rapid rupture of the large earthquake.The phenomenons of dynamic stress triggering earthquakes was observed in the western United States after the Landes 7.3 earthquake in 1992,which caught the the attention for international seismological research institutes.Xinjiang lies at South Central Eurasian plate,the subduction of the India plate to the Eurasian plate,is located in the south of the Eurasian plate where is mainly of strong earthquake activity in China,occurring a large number of small-earthquakes.The seismic activity in Xinjiang Region is characterized by high intensity and high frequency.Under this background,we use the observation data of Xinjiang regional digital seismic network stations,put to use the method of the discrete wavenumber method,envelope function analysis and statistical values of ?and research the dynamic triggering of small earthquake activity for the regions of Urumqi and the Kashi-Wuqia by February 12,2014 Yutian MS7.3 earthquake,MS8.1 earthquake,October 26,2015 in Nepal in April 25,2015 December 7,2015,the Hindu Kush earthquake of MS7.8 November 25,2016 Tajikistan MS7.4 earthquake aqtau MS6.7 earthquakeThrough the above research work,we get the following conclusions:(1)Since 2014 Xinjiang and its adjacent area of 5 MS more than 6.7 earthquake in the adjacent areas of Urumqi and Kashi and Wuqia area at the intersection of the dynamic stress calculation results show that the dynamic Yutian 7.3 earthquake and Tajikistan 7.4 earthquake in the adjacent areas of Urumqi the stress changes over the dynamic stress triggering threshold,dynamic to a certain extent the stress triggering effect;Yutian 7.3 earthquake,Nepal 8.1 earthquake,a magnitude 7.4 earthquake in Tajikistan and Arketao 6.7 earthquake stress change dynamics in Kashi Wuqia region have more than the intersection of the dynamic stress triggering threshold,that these earthquakes have more obvious stress disturbance in this area.(2)The analysis method of envelope function based on the detection of 8.1 Nepal earthquake triggered 8 small earthquakes in Kashi Wuqia area at the intersection of the event,the remaining 4 earthquake in Urumqi and the adjacent area and the intersection of small earthquakes in Kashi Wuqia region events identified more than 1 to 3 times less.On the one hand,it is related to the relative density of the network and the high noise level in the study area.On the other hand,it may be related to the tectonic environment and stress state of the study area.With the increase of the density of stations in Xinjiang area,the template matching method can be used to improve the detection ability of triggering small earthquakes.(3)?-statistical value showed that before and after the Yutian 7.3 earthquake,a magnitude 7.4 earthquake in Tajikistan within one month of seismic activity in Urumqi and adjacent areas there have been significant changes;1 months Yutian 7.3 earthquake,a magnitude 8.1 earthquake in Nepal,Arketao 6.7 earthquake in Kashi Wuqia area at the intersection of seismic activity appeared significantly enhance the change.It is shown that the dynamic triggering effect of strong earthquake is caused by both the instant triggering of the surface wave and the delayed triggering of the lag time.(4)In addition to the dynamic Coulomb Tajikistan 7.4 earthquake in Urumqi and the adjacent area should be small earthquake events,change detection and beta statistical results are inconsistent,dynamically generated the remaining 4 times more than magnitude 6.7 earthquake stress perturbation results and seismic events,the?-statistical value in Urumqi,and the the adjacent area and the Kashi Wuqia region convergence of the impact of the seismic activity is consistent.