摘要
本文首先总结了地震预警系统中采用的一些实时定位方法,随后结合我国地震监测台网实际运行情况,提出了一套从单个台站触发开始逐渐过渡到利用前四台触发信息的完整地震预警连续定位方法.利用福建省地震监测台网记录的68个M3.0级以上地震观测记录,对本文方法的验证结果表明,对于网内地震,采用本文方法的单台定位结果误差均小于为50km,双台定位结果误差均小于35km,三台定位结果误差约为15km,四台定位结果误差约为6km;网外地震的三台、四台定位结果误差均小于30km.推导了采用本文三、四台预警定位方法的误差公式.利用福建地区现有及"十一五"完成后的地震观测台网分别计算得到了定位误差分布图.根据误差分析结果即可对定位结果的可靠性预先做出判断,有利于提高地震预警系统运行的可靠性.
In this paper,the author first summarized real-time location methods applied in earthquake early warning system,then considering the actual situation of seismic monitoring network in our country,we proposed a complete set of location method that continuously locates an earthquake from only one triggered monitoring station to four stations.In order to test the method,we selected 68 earthquakes above magnitude 3.0 recorded by Fujian earthquake monitoring networks.The result shows that,for most in-net earthquakes,the single station method′s location error is all less than 50 km,the two-station′s location error is less than 35 km,the three-station′s location error is about 15 km,and four-station′s location error is about 6 km;for out-net earthquakes,the three or four-station method′s location error all less than 30 km.We deduced the location error estimation function for the method using first three,four station′s information.The distributions of location errors for the present seismic monitoring stations and the new monitoring stations after the ＂eleventh five-year plan＂ construction in Fujian region were drawn separately.Based on these analyses,we can make judgment of the location results in advance,and then the reliability of the whole earthquake early warning system can be improved.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第3期925-936,共12页
Chinese Journal of Geophysics
基金
地震行业科研专项(2008419024)
国家科技支撑计划(2009BAK55B01
2009BAK55B02)共同资助
关键词
地震预警
连续定位
定位误差
Earthquake early warning
Continuous earthquake location
Location error
