Application of Predomination Period and Background Value Anomaly to Establish Earthquake Early Warning Model-Application in Chiufenershan Landslide

摘要

In this study, for dangerous slope and underground pipelines, the application of seismic monitoring stations of P-wave data analysis, and use the slope of the critical acceleration to establish of early warning criteria and development of earthquake early warning system prototype. Base on the P-wave predominant period concept, this study aimed to find relation of predominant period and peak ground acceleration for the Chiufenershan landslide. The seismic records from 4 seismic monitoring station of Central Weather Bureau near the Chiufenershan in the past 17 years were obtained and applied for the correlation analysis. Used the Matlab program to find all three spatial directions of the relationship between predomianat period and peak ground acceleration. In addition, this study also used the concept of background anomaly with morning, afternoon and evening of the constant background values when the average maximum displacement and P-wave arrival within 3 seconds of the maximum displacement divided by draw strength index, which one of index and three spatial direction of the peak ground acceleration regression analysis to explore the best relationship.By a research results of predominant period can be obtained the warning formula from the Chiufenershan landslide area and the Chung Hsing university area. For example, the acceleration range for intensity of 5 was 80gal to 250gal, it can be use to estimate the predomianat period range was 12.1 to 34.1 and 14.5 to 76.9 , respectively. Background anomaly in the study found that when the strong index(K) between 18.64 and 19.43, it was likely to occur when the landslide slope leading to the critical sliding acceleration.In this study, not only investigate the Chiufenershan landslide warning criteria, but also analysis two stations (Chung Hsiao primary school station and Chong Guang primary school station) of Chung Hsing University area. Use Visual basic 6.0 program with new seismic instrument Palert to establish a region and for automated earthquake early warning early warning system prototype for Chung Hsing University area.