Analysis of regional seismic energy field before Wenchuan M_S 8.0 earthquake
Heqing Ma · Progress in geophysics · 2012
Taking the seismic activity as the random field and taking the energy released by earthquakes as the basic elements of the seismicity field,the method of natural perpendicular function(or named experiential perpendicular function) development has been adopted to discuss the spatiotemporal features about the energy field of the regional seismic activity before MS 8.0 earthquake,Wenchuan,Sichuan,2008.The results have showed that,before Wenchuan MS 8.0 earthquake,the time weight factors of the eigenvectors(typical field) of the energy field that several key eigenvalues correspond to before Wenchuan MS 8.0 earthquake have appeared very evident rising or decreasing abnormal changes.The spatial image of the key typical fields has also showed some abnormal distributional features which could be the short-term index for earthquake forecasting.The author thinks that this method is a seismic activity forecasting method that worth further discussing.