Study Of Seismic Intensity Quick-report System Based On Energy Method

Since the1990s, the Earthquake Quick-Report technology based on real-timemonitoring network has developed rapidly home and abroad. The real-time EarthquakeQuick-Report technology in worldwide major earthquake–prone regions such as theUSA, Japan, Mexico, Taiwan of China has been reaching to a mature stage. Seismicintensity quick-report, which means quickly getting the earthquake affected areasintensity distribution through real-time processing the data recorded by the monitoringnetwork in a few minutes to decades of minutes after an earthquake, provides a basis fordetermining the severity of damage in different regions caused by the attack.Till now, intensity quick-report systems at home and abroad have shared the samecalculation principle that all based on an empirical statistical relationship between singleparameter such as PGA, as well as equivalent peak acceleration (substituted by Ap)andintensity. These parameters were significantly affected by the surface soil. Getting the surface seismic peak ground motion based on rock station’s recorded seismic data, the amplification of soil parameters must be considered, however, different site conditions means different soil amplification. This paper attempted to put forward the energyparameter of seismic records (substituted byE v2(t)dt) from the view of energyprinciple, which differed from the existing quick-report systems that were based on theconcept of force design applications. The parameter took full advantage of the entireseismic data recorded, taking the impact of the magnitude of ground motion and duringtime of earthquake into account, the inconsistent influence of soil amplification isrelatively weakened. As a supplement to existing quick-report system, An intensityquick-report system based on energy parameter is the ultimate goal of this article.The paper first introduced details of seeking energy parameter from recordedseismic data of various stations in the seismic monitoring network, obtained anempirical formula between the energy parameter and the instrumental intensity throughstatistical analysis on a huge amount of seismic recording data（total No.8183） ofJapan earthquakes, WenChuan aftershocks and so on. In order to verify the statisticalformulaI1.397lg E (v2)4.088, the paper then compared the single station seismicintensity and the regional interpolated intensity distribution results obtained by theformula and by the local standard “DB35/T1308-2012Instrumental Seismic IntensityScale” of Fujian Province, the feasibility of seismic intensity quick-report system basedon energy principle had been tested through comparisons of a set of typical earthquake cases. Finally, we assumed that the P-wave and S-wave arrival time of each station inpoint-source earthquakes were linearly distributed, then simulated the dynamic changesof the cumulative seismic energy distribution during the earthquake process by therecorded data of two cases. The results showed that the energy parameter of this articlecan reflect the dynamic seismic energy distribution during earthquake process well.