临汾中心地震台“十五”前兆观测系统综述
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摘要
对临汾中心地震台"十五"前兆观测系统运行情况进行了统计分析,结果表明:该观测系统工作状态稳定、运转情况良好,产出数据的连续率、完整率等指标达到了规范中≥95%的要求;3套形变观测数据"内精度"达到了国家"Ⅰ"类形变台的标准,对于全球7级以上地震和全国6级左右地震,石英摆倾斜仪能清晰记录到50%以上地震的前驱波现象;在同一地震前垂直摆出现的异常变化与石英摆存在截然不同的异常图像形态,这可能与两仪器自身之间的摆系、工作周期、频率等指标的差异性有关;大地电场有较好的远场异常效应,在青海海西等地震前记录到了明显的短临异常。
The operation situation of precursor observation system of Linfen central seismological station constructed in 10th five-year plan is analyzed statistically in this paper.The results indicate that the observation system works well and stably,and the indexes of producing data,such as continuous rate and integrity rate,are larger than 95 percent,met with criterion request.The intrinsic precision of three types of deformation observation data reaches the criterion of the first class of national deformation station.Precursor waves of more than 50 percent of earthquakes,including global Ms≥7.0 and about Ms 6.0 earthquakes in China,can be recorded clearly by the quartz pendulum tiltmeter.However,even before the same earthquake,anomalous variations recorded by vertical pendulum show completely different shapes,compared with quartz pendulum,which is probably related with the different pendulum system,working period and frequency of the two types of instruments.Obvious short impending anomaly is recorded by geoelectric field before Haixi,Qinghai earthquake,indicating that the geoelectric field has good far-field effect.
The operation situation of precursor observation system of Linfen central seismological station constructed in 10th five-year plan is analyzed statistically in this paper.The results indicate that the observation system works well and stably,and the indexes of producing data,such as continuous rate and integrity rate,are larger than 95 percent,met with criterion request.The intrinsic precision of three types of deformation observation data reaches the criterion of the first class of national deformation station.Precursor waves of more than 50 percent of earthquakes,including global Ms≥7.0 and about Ms 6.0 earthquakes in China,can be recorded clearly by the quartz pendulum tiltmeter.However,even before the same earthquake,anomalous variations recorded by vertical pendulum show completely different shapes,compared with quartz pendulum,which is probably related with the different pendulum system,working period and frequency of the two types of instruments.Obvious short impending anomaly is recorded by geoelectric field before Haixi,Qinghai earthquake,indicating that the geoelectric field has good far-field effect.
引文
[1]高振强,冯建琴,张仰辉,等.山西临汾中心地震台石英摆倾斜仪前驱波特征分析[J].山西地震,2009(2):1-6.
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[3]马钦忠,冯志生,宋治平.崇明与南京台震前地电场变化异常分析[J].地震学报,2004,26(3):304-312.
[4]马钦忠.地电场多极距观测装置系统与文安MS5.1地震前首都圈地电场异常研究[J].地震学报,2008,30(6):615-625.
[5]张学民,翟彦忠,郭学增,等.远震前的地电场潮汐波异常[J].地震学报,2007,29(1):48-58.
[2]毛桐恩,席继楼,王艳琼,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):519-528.
[3]马钦忠,冯志生,宋治平.崇明与南京台震前地电场变化异常分析[J].地震学报,2004,26(3):304-312.
[4]马钦忠.地电场多极距观测装置系统与文安MS5.1地震前首都圈地电场异常研究[J].地震学报,2008,30(6):615-625.
[5]张学民,翟彦忠,郭学增,等.远震前的地电场潮汐波异常[J].地震学报,2007,29(1):48-58.
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