| Calculation of Calibration Functions and Explosive Aftershock Magnitudes in the Near Field |
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| 引用本文： | Li Xuezheng,Wang Haijun,Lei Jun. Calculation of Calibration Functions and Explosive Aftershock Magnitudes in the Near Field[J]. 中国地震研究, 2003, 17(4): 305-314 |
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| 作者姓名： | Li Xuezheng Wang Haijun Lei Jun |
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| 作者单位： | [1]NorthwestNuclearTechnologyInstitute,Xi＇an710024,China [2]Xi＇anJiaotongUniversity,Xi＇an710049,China [3]BeijingUniversity,Beijing100871,China |
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| 摘 要： | The current calibration function used in calculating the magnitude of natural earthquakes within 5km is a constant; a fact that causes several serious difficulties for the calculation of the magnitude of small and shallow-focus earthquakes. According to the attenuation law of explosions and the propagation theory of elastic waves, the calibration function is calculated for near field quakes from 0kin to 5kin. Magnitudes of two aftershock sequences are calculated. The magnitudes of most explosion earthquakes are small, ranging mainly from magnitude -0.5 to 1.0. The M-t chart of the explosive aftershocks is completely different from that of strong earthquake aftershocks. It not only shows positive columnar lines indieatJng large magnitudes but also short negative columnar lines indicating small magnitudes.
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| 关 键 词： | 地震学 余震 标准函数 能量 |
Calculation of Calibration Functions and Explosive Aftershock Magnitudes in the Near Field |
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| Li Xuezheng,Wang Haijun and Lei Jun. Calculation of Calibration Functions and Explosive Aftershock Magnitudes in the Near Field[J]. Earthquake Research in China, 2003, 17(4): 305-314 |
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| Authors: | Li Xuezheng Wang Haijun Lei Jun |
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| Affiliation: | Northwest Nuclear Technology Institute, Xi'an 710024, China;Xi'an Jiaotong University, Xi'an 710049, China;Beijing University, Beijing 100871, China |
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| Abstract: | The current calibration function used in calculating the magnitude of natural earthquakes within 5km is a constant; a fact that causes several serious difficulties for the calculation of the magnitude of small and shallow-focus earthquakes. According to the attenuation law of explosions and the propagation theory of elastic waves, the calibration function is calculated for near field quakes from 0km to 5km. Magnitudes of two aftershock sequences are calculated. The magnitudes of most explosion earthquakes are small, ranging mainly from magnitude -0.5 to 1.0. The M-t chart of the explosive aftershocks is completely different from that of strong earthquake aftershocks. It not only shows positive columnar lines indicating large magnitudes but also short negative columnar lines indicating small magnitudes. |
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| Keywords: | Explosion aftershocks Calibration function Magnitude distribution |
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