[1]YUAN Guiping,FENG Zhisheng,LI Hongyu,et al.Application of First-Order Difference Method in the Extraction of Seismic Geomagnetism Precursor Signal[J].Journal of Seismological Research,2020,43(04):738-744.
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Application of First-Order Difference Method in the Extraction of Seismic Geomagnetism Precursor Signal
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 04
Page number:
738-744
Column:
Public date:
2020-09-17
- Title:
- Application of First-Order Difference Method in the Extraction of Seismic Geomagnetism Precursor Signal
- Keywords:
- geomagnetism anomaly; total geomagnetic intensity; first-order difference; precursor anomaly
- CLC:
- P315.721
- DOI:
- -
- Abstract:
- On the basis of exploring the spatial correlation anomaly mechanism of geomagnetism daily one-value before earthquake,using the total geomagnetic field data of 130 stations from 2008 to 2018,we calculated the spatial variation of the one-value first-order difference of the total geomagnetic field F and extracted the geomagnetic anomalies before earthquakes.The results show that when the non-synchronous phenomena on the gradual increase of F was appeared,the normal state of all positive or all negative difference values in the study area will be broken.As a result,there appreaed the distribution of positive and negative value stations whose the first order difference isoline of F daily value are more concentrated in the region,and there is an obvious abnormal boundary(zero value line)between positive and negative value stations.According to the statistics of anomalies and corresponding earthquake,it is found that there is the possibility of M≥5 earthquakes occurring within 8 months after the occurrence of the anomaly near 300 km of the zero line.
- References:
- -
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Last Update:
2020-09-17