Wavelet power spectrum analysis of the electromagnetic signals of Wenchuan MS8.0 and Haiti MW7.0 earthquakes
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摘要: 应用小波变换方法处理了2008年汶川MS8.0地震前后成都、 江油台地电阻率观测数据及汶川地震、 2010年海地MW7.0地震前后DEMETER卫星记录的电离层磁场观测数据， 研究了地电阻率和电离层磁场的小波能谱及其相对变化.结果表明： ① 对应汶川大震前成都台N58°E测道地电阻率中期下降变化和短期上升变化的时段， 地电阻率小波能谱相对变化显著增大， 江油台N10°E测道地电阻率在主震前记录到了临震异常， 在临近主震前后， 电离层磁场特别是x分量的能谱及相对变化显著增大， 展现了与汶川大震明显对应的地电阻率、 电离层磁场变化的似同步异常； ② 在海地地震前夕， 电离层磁场x， z分量的能谱也出现了显著增大的现象， 类似于汶川大震前后电离层磁场的能谱增大变化.Abstract: Wavelet transform technique is applied to the analysis of geo-resistivity data observed at Chengdu and Jiangyou stations before and after Wenchuan MS8.0 earthquake in 2008 and the ionospheric magnetic field recorded by DEMETER satellite before and after the Wenchuan earthquake and the 2010 Haiti earthquake, in order to study the wavelet power spectrum of geo-resistivity and ionospheric magnetic field and its relative variation. Our analysis result suggests that ① the wavelet power spectrum and its relative variation increased greatly at the times when the geo-resistivity of N58°E channel of Chengdu station displayed its medium-term decrease and short-term increase, the impending anomaly was recorded on the N10°E channel of Jiangyou geo-resistivity station and the wavelet power spectrum of x component of ionospheric magnetic field and its relative value increased distinctly before Wenchuan earthquake, showing typical Earth-space electromagnetic anomaly of geo-resistivity and ionospheric magnetic field; ② The wavelet power spectrum of x and z components of ionospheric magnetic field and its relative variation also increased greatly before Haiti earthquake, similar to the increase before and after Wenchuan earthquake.
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Keywords:
- Wenchuan earthquake /
- Haiti earthquake /
- wavelet analysis /
- earthquake anomaly
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图 1 汶川MS8.0地震前后成都台地电阻率小波能谱及其相对变化
(a) N58°E测道地电阻率日均值曲线(上)、 小波能谱(中)和小波能谱相对变化(下)； (b) N49°W测道地电阻率日均值曲线(上)、 小波能谱(中)和小波能谱相对变化(下)
Figure 1. Wavelet power spectrum of geo-resistivity and its relative variation at Chengdu station before and after Wenchuan earthquake
(a) Curve of daily mean value (upper), wavelet power spectrum (middle) and its relative variation (lower) on the N58°E channel; (b) Curve of daily mean value (upper), wavelet power spectrum (middle) and its relative variation (lower) on the N49°W channel
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图 2 图2 汶川地震前江油台N10°E测道地电阻率日均值曲线(上)，小波能谱(中)及小波能谱相对变化(下)
Figure 2. urve of daily mean value of geo-resistivity (upper), wavelet power spectrum (middle) and its relative variation (lower) on the N10°E channel of Jiangyou station before Wenchuan earthquake
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图 3 汶川地震前后电离层磁场小波能谱及其相对变化
(a) 电离层磁场x分量日值曲线(上)、 小波能谱(中)和小波能谱相对变化(下)；(b) 电离层磁场y分量日值曲线(上)、 小波能谱(中)和小波能谱相对变化(下)
Figure 3. Wavelet power spectrum of ionospheric magnetic field and its relative variation before and after Wenchuan earthquake
(a) Curve of daily mean value (upper), wavelet power spectrum (middle) and its relative variation (lower) of x component; (b) Curve of daily mean value (upper), wavelet power spectrum (middle) and its relative variation (lower) of y component
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图 4 海地地震前后电离层磁场小波能谱及其相对变化
(a) 电离层磁场x分量日值序列(上)、 小波能谱(中)和小波能谱相对变化(下)；(b) 电离层磁场z分量日值序列(上)、 小波能谱(中)和小波能谱相对变化(下)
Figure 4. Wavelet power spectrum of ionospheric magnetic field and its relative variation before and after Haiti earthquake
(a) Curve of daily mean value (upper), wavelet power spectrum (middle) and its relative variation (lower) of x component; (b) Curve of daily mean value (upper), wavelet power spectrum (middle) and its relative variation (lower) of z component
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