应急流动观测组网技术在康定6.3级地震中的应用

以2014年11月22日四川康定发生6.3级地震后开展应急流动观测为例,描述了在应急流动观测组网中,如何应对震区高原环境,完成4个流动台选址架台、快速组网、运维保障;并通过对流动台址地动噪声功率谱密度分析计算,获得的台基达Ⅱ或Ⅲ级环境地动噪声水平,余震微小震检测能力与定位精度得到极大改善。流动台网运行期间,提高了震区监测台站覆盖面,记录到了大量余震微小震,加密台站对震区定位精度提升了量级,震源深度、震级更加准确。结果表明:一旦大震发生后,及时组织开展应急流动观测是必要的,而完成好一次大震后快速有效的应急流动监测,必须综合考虑震区地域环境、人员配备、预案选择、通信条件、设备可靠诸多因素与运维保障,采用固定与流动台联合组网方式,应急流动发挥效益最佳。

The Application of Emergency Portable Seismological Observation Network Technology in Kangding M_S6.3 Earthquake

The Kangding MS6.3 earthquake occurred on Nov.22nd,2014 in Sichuan province.Taking the Kangding earthquake emergency temporary observation as an example,this paper introduces how to deal with the plateau environment in earthquake area,completes 4 temporary seismic stations,rapid networking,operation and maintenance support.A certain number of data form observation stations are randomly selected to analyze the noise power spectral density,and the results show that the ambient noise level of temporary seismic stations isⅡorⅢ,aftershock monitoring capability and positioning accuracy have been greatly improved.The temporary seismic network improves the distribution of the stations in earthquake area,thousands of aftershocks were recorded,the hypocentral location,focal depth and magnitude of earthquake are more accurate after the stations are encrypted.The results show that it is very necessary to carry out effective temporary seismologic observation after a large earthquake.The rapid and effective emergency temporary seismologic observation must comprehensively consider many factors such as the environment in the earthquake area,staffing,communication conditions,plan selection,reliable equipment,and maintenance support,and the combination of permanent and temporary seismic stations is the best way.