地震研究

利用2010年1月1日至2014年4月30日我国地磁台网100多个台站的地磁总强度F子夜均值数据,逐一分析了F子夜均值逐日差的空间变化趋势。结果表明,在此期间有18次小区域的异常变化,其中16次异常与其后几天到半年时间内该区域发生的地震有很好的对应关系,另外两次新近的异常有待后续进一步验证。我国西北部地区地磁台站稀疏,布局不合理,限制了对新疆、青海、西藏等地震多发区震磁关系的研究,建议这些地区进一步加密台站建设,优化布局。

Based on the daily geomagnetic absolute averages of geomagnetic total intensity F at local midnight recorded by more than 100 stations in China Geomagnetic Network from Jan.1, 2010 to Apr.30, 2014, we analyzed the spatial variation characteristic of daily geomagnetic field F. The results show that there were 18 times abnormal changes of geomagnetic field in small region in the study period, the 16 times abnormal changes of them had the good corresponding relationship with the earthquake which occurred from a few days to six months after the abnormal changes in the study area, and the other two newly abnormal changes should still be observed and verified. The distribution of stations is sparse and their layout is unreasonable in Northwestern region of China, which limited studying the seismic-magnetic relationship in earthquake-prone zones, such as Xinjiang, Qinghai, Tibet etc.. It is suggest that we should make stations density and optimize their layout.

引言
1 资料的选取和计算
2 数据分析
3 结论与讨论

图1 F子夜均值逐日差的正常规律变化空间分布图<br/>(a)由东南向西北递增;(b)由东南向西北递减;(c)由南向北递增;(d)由南向北递减;(e)由西南向<br/>东北递增;(f)由西南向东北递减;(g)由东向西递增;(h)由东向西递减<br/>Fig.1 Spatial distribution of the regular changes of DVFLM(a)increase from southeast to northwest;(b)decrease from southeast to northwest;(c)increase from south to north;

图1 F子夜均值逐日差的正常规律变化空间分布图
(a)由东南向西北递增;(b)由东南向西北递减;(c)由南向北递增;(d)由南向北递减;(e)由西南向
东北递增;(f)由西南向东北递减;(g)由东向西递增;(h)由东向西递减
Fig.1 Spatial distribution of the regular changes of DVFLM(a)increase from southeast to northwest;(b)decrease from southeast to northwest;(c)increase from south to north;

表1 地磁异常与地震的对应关系<br/>Tab.1 Geomagnetic anomaly corresponding to the earthquake

表1 地磁异常与地震的对应关系
Tab.1 Geomagnetic anomaly corresponding to the earthquake

图2 玉树MS7.1地震及MS5.7余震前地磁异常情况<br/>Tab.2 Geomagnetic anomalies before Yushu MS7.1 earthquake and its aftershocks

图2 玉树MS7.1地震及MS5.7余震前地磁异常情况
Tab.2 Geomagnetic anomalies before Yushu MS7.1 earthquake and its aftershocks

图3 江西瑞昌MS4.5地震前地磁异常情况<br/>Tab.3 Geomagnetic anomalies before Ruichang MS4.5 earthquake in Jiangxi

图3 江西瑞昌MS4.5地震前地磁异常情况
Tab.3 Geomagnetic anomalies before Ruichang MS4.5 earthquake in Jiangxi

图4 江苏高邮—宝应MS4.9地震前地磁异常情况<br/>Tab.4 Geomagnetic anomalies before Gaoyou-Baoying MS4.9 earthquake in Jiangsu

图4 江苏高邮—宝应MS4.9地震前地磁异常情况
Tab.4 Geomagnetic anomalies before Gaoyou-Baoying MS4.9 earthquake in Jiangsu

图5 吉林省松原市乾安县与前郭尔罗斯蒙古族自治县交界MS5.3地震前地磁异常情况<br/>Tab.5 Geomagnetic anomalies before MS5.3 earthquake occurred at the junction of Qiangan Country in Songyuan City in Jilin and Qian Gorlos Mongol Autonomous County

图5 吉林省松原市乾安县与前郭尔罗斯蒙古族自治县交界MS5.3地震前地磁异常情况
Tab.5 Geomagnetic anomalies before MS5.3 earthquake occurred at the junction of Qiangan Country in Songyuan City in Jilin and Qian Gorlos Mongol Autonomous County

白春华,徐文耀,康国发.2008.地球主磁场模型[J].地球物理学进展,23(4):1045-1057.
王建军,杨冬梅,张素琴,等.2010.地磁数据预处理质量标注系统[J].地震地磁观测与研究,31(5):85-90.
张建国,陈化然,刘晓灿.2009.地磁场子夜均值逐日动态演化特征及与汶川大地震关系研究[J].国际地震动态,(7):31-34.
Chen C.H.,Liu J.Y.,Yen H.Y.,et al..2004.Changes of Geomagnetic Total Field,Occurrences of Earthquakes in Taiwan[J].TAO,15(3):3361-370.
Freund F..2000.Time Resolved Study of Charge Generation and Propagation in Igneous Rocks[J].J.Geophys.Res.105:11001–11019.
Hattori K.,Takahashi I.,Yoshino C.,et al..2004.ULF Geomagnetic Field Measurements in Japan and Some Recent Results Associated with Iwateken Nairiku Hokubu Earthquake in 1998[J].Phys Chem Earth,29(4-9):481–494.
Hayakawa M..1999.Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes[M].Tokyo,Terra Scientific Publishing Company.
Hayakawa,M.,Fujinawa Y.Eds..1994.Electromagnetic Phenomena Related to Earthquake Prediction[M].Tokyo:TERRAPUB,667.
Yen H.Y.,Chen C.H.,Yeh Y.H.,et al..2004.Geomagnetic fluctuations during the 1999 Chi-Chi earthquake in Taiwan[J].Earth Planets Space,56:39–45.
Molchanov O.A.,Hayakawa M..1998.Subionospheric VLF Signal Perturbations Possibly Related to Earthquakes[J].J.Geophys.Res.,103(17),489–17:504.
Newitt L R.,Barton C.E.,Bitterly J..1996.Guide for Magnetic Repeat Station Surveys[M].325 Broadway,Boulder,CO USA.,International Association of Geomagnetism and Aeronomy J.NOAA Space Environment Center.
Pulinets S.A..1998.Seismic Activity as a Source of Ionospheric Variability[J].Adv.Space Res.,22(6):903-906.
Sabaka T.J.,Olsen N.,Purucker M.2004.Extending Comprehensive Models of the Earth's Magnetic Field with Oersted and CHAMP[J].Geophys J Int.,159(2):521–547.
Schulz G.,Beblo M..1984.On the Reduction of Time Variations for Magnetic Repeat Station Measurements[J].Geophysical Surveys,6(3-4):323-332.
Zeng X.P.,Lin Y.,Xu C.,et al..2001.Turning Changes in Evolution of Geomagnetic Field and Infrastructural Analysis of Earthquake Prediction[J].Kybernetes-Int.J.Systems & Cybernetics,30:365-377.

备注

引言

1 资料的选取和计算

2 数据分析

3 结论与讨论

期刊信息