Fault deformation anomaly and intermedi-ate and short-term prediction of the Jingtai Ms=5.9 earthquake

作     者：WANG Shuang-xu 

作者机构：The Second Crustal Deformation Monitoring Center China Seismological Bureau Xi’an China 

出 版 物：《Acta Seismologica Sinica(English Edition)》 (ACTA SEISMOLOGICA SINICA (ENGLISH EDITION))

年 卷 期：2001年第14卷第2期

页      面：156-165页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：国家重点基础研究发展计划(973计划) State Scientific and Technological Project of the 2Ninth Five-Year Plan2 

主　　题：Jingtai M s =5.9 earthquake fault deformation anomaly characteristics intermediate and short-term earthquake prediction P315.72 + 5 

摘      要：The time-space distribution characteristics of fault deformation anomaly in the near-source region and its outlying zone in the seismogenic process of the Jingtai Ms=5.9 earthquake occurred on June 6, 2000 in Gansu Province is studied preliminary. The distribution scope of fault deformation anomaly before the earthquake is wide, the anomaly shape is complicated and the pattern anomalous zone of fault deformation (strain) information index is obvious. The shape and amplitude of fault deformation anomaly in different regions differ significantly, which is closely related with the tectonic location of anomaly. The fault deformation anomaly of α β, and γ phases along the western segment of Haiyuan fault zone shows the process from the quasi-linearity to non-linearity of fault movement in the near-source region, matches the high-value anomalous area of fault deformation (strain) information index, and reflects the high strain accumulation in the seismogenic region. However, the anomaly of abrupt jump and cusp with a large amplitude occurred in the areas far from the earthquake, such as Liupanshan fault zone which is the tectonic convergent section does not reflect the strain accumulation of its location, maybe it is a sign that the regional tectonic stress field is strengthened in the seismogenic process. Based on the above-mentioned facts and combined with the preliminary summary of experiences and lessons in the intermediate and short-term prediction of the Jingtai Ms=5.9 earthquake, we study and explore the application of fault deformation anomaly to earthquake judgment.