Continuous estimates on the earthquake early warning magnitude by use of the near-field acceleration records
Jun Li1, Xing Jin1, 2, 3, Yongxiang Wei1, Hongcai Zhang1
1 Earthquake Administration of Fujian Province, Fuzhou 350003, China 2 Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China 3 Fuzhou University, Fuzhou 350002, China
Continuous estimates on the earthquake early warning magnitude by use of the near-field acceleration records
Jun Li1, Xing Jin1, 2, 3, Yongxiang Wei1, Hongcai Zhang1
1 Earthquake Administration of Fujian Province, Fuzhou 350003, China 2 Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China 3 Fuzhou University, Fuzhou 350002, China
摘要In this article, the seismic records of Japan’s Kik-net are selected to measure the acceleration, displacement, and effective peak acceleration of each seismic record within a certain time after P wave, then a continuous estimation is given on earthquake early warning magnitude through statistical analysis method, and Wenchuan earthquake record is utilized to check the method. The results show that the reliability of earthquake early warning magnitude continuously increases with the increase of the seismic information, the biggest residual happens if the acceleration is adopted to fit earthquake magnitude, which may be caused by rich high-frequency components and large dispersion of peak value in acceleration record, the influence caused by the high-frequency components can be effectively reduced if the effective peak acceleration and peak displacement is adopted, it is estimated that the dispersion of earthquake magnitude obviously reduces, but it is easy for peak displacement to be affected by long-period drifting. In various components, the residual enlargement phenomenon at vertical direction is almost unobvious, thus it is recommended in this article that the effective peak acceleration at vertical direction is preferred to estimate earthquake early warning magnitude. Through adopting Wenchuan strong earthquake record to check the method mentioned in this article, it is found that this method can be used to quickly, stably, and accurately estimate the early warning magnitude of this earthquake, which shows that this method is completely applicable for earthquake early warning.
Abstract：In this article, the seismic records of Japan’s Kik-net are selected to measure the acceleration, displacement, and effective peak acceleration of each seismic record within a certain time after P wave, then a continuous estimation is given on earthquake early warning magnitude through statistical analysis method, and Wenchuan earthquake record is utilized to check the method. The results show that the reliability of earthquake early warning magnitude continuously increases with the increase of the seismic information, the biggest residual happens if the acceleration is adopted to fit earthquake magnitude, which may be caused by rich high-frequency components and large dispersion of peak value in acceleration record, the influence caused by the high-frequency components can be effectively reduced if the effective peak acceleration and peak displacement is adopted, it is estimated that the dispersion of earthquake magnitude obviously reduces, but it is easy for peak displacement to be affected by long-period drifting. In various components, the residual enlargement phenomenon at vertical direction is almost unobvious, thus it is recommended in this article that the effective peak acceleration at vertical direction is preferred to estimate earthquake early warning magnitude. Through adopting Wenchuan strong earthquake record to check the method mentioned in this article, it is found that this method can be used to quickly, stably, and accurately estimate the early warning magnitude of this earthquake, which shows that this method is completely applicable for earthquake early warning.
Jun Li, Xing Jin, Yongxiang Wei, Hongcai Zhang. Continuous estimates on the earthquake early warning magnitude by use of the near-field acceleration records[J]. 《地震学报》英文版, 2013, 26(5): 351-356.
Jun Li, Xing Jin, Yongxiang Wei, Hongcai Zhang. Continuous estimates on the earthquake early warning magnitude by use of the near-field acceleration records. Earthquake Science, 2013, 26(5): 351-356.
