| 岩石破裂电磁辐射的频率特性 |
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| 引用本文： | 郭自强,刘斌.岩石破裂电磁辐射的频率特性[J].地球物理学报,1995,38(2):221-226. |
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| 作者姓名： | 郭自强 刘斌 |
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| 作者单位： | 1. 中国科学技术大学研究生院, 北京 100039;
2. 中国科学技术大学地球及空间科学系, 合肥 230026 |
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| 基金项目： | 国家自然科学基金,地震科学联合基金 |
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| 摘 要： | 本文提出岩石破裂时产生的低频电磁辐射起源于微破裂引起的电子发射，并用电四极子模型计算了近区电磁场的频率特性．结果表明，近区电磁场的频率与样品尺寸和初始裂纹长度有关，利用典型实验样品尺寸和花岗岩初始裂纹数据计算出近区电磁场的频率为５０ｋＨＺ－１ＭＨｚ量级．它与已有实验测量结果相符．
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| 关 键 词： | 岩石破裂 电磁辐射 破裂电磁辐射 |
| 收稿时间： | 1994-03-20 |
FREQUENCY PROPERTIES OF ELECTROMAGNETIC EMISSION ASSOCIATED WITH MICROSCOPICCRACKING IN ROCKS |
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| GUO ZI-QIANG.FREQUENCY PROPERTIES OF ELECTROMAGNETIC EMISSION ASSOCIATED WITH MICROSCOPICCRACKING IN ROCKS[J].Chinese Journal of Geophysics,1995,38(2):221-226. |
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| Authors: | GUO ZI-QIANG |
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| Institution: | 1. The Graduate School, University of Science and Technology of China , Beijing 100039;
2. Department of Earth and Space Science, University, Universityof Science and Technology of China , Hefei 230026 |
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| Abstract: | A mechanism that low frequency electromagnetic emission(EME) observed duringrock fracture can result directly from the emission of electrons associated withmicrocracking in rocks was proposed. The model of a compressed atom is used to explain the source of electrons that emit from the atoms around the tip end of acrack during microcracking. Consequently, EME can be modeled by an electric qua-dripole associated with the distribution of positive and negative charges around acrack that expands at speed V during microcracking. Using the model,the frequencyrange of EME can be determined. For typical rock samples studied under labconditions,the frequency ranges of EME are calculated to vary from about 50kHzto 2MHz, Which are comparable to the ranges observed in lab experiments. |
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| Keywords: | Rock Fracture Electromagnetic radiation Fractoemission |
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