淮安地震台井下测震的偏差研究及校正
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摘要
自1989年5月淮安地震台深井测震投入运行以来,通过多年的实际观测,我们发现淮安地震台井下测震记录到的地震震级、震中位置,与江苏省地震局台网确定的地震震级、震中位置有一定的偏差。本文根据地震波传播理论,对出现这些偏差的因素进行了探讨。运用大量的地震观测数据进行统计分析,得出了淮安地震台井下测震记录到的地震震级(ML)低于江苏省地震局台网平均震级约ML0·36;震中位置的偏差为51·3°(逆时针转动)。并对淮安地震台的地震监测能力进行了研究。井下测震的地震监测能力理论值要高于实际观测值,一般高ML0·21左右。研究还表明,震级偏差的大小随着震中距的增大而递减,不同方位的地震震级偏差也不相同。
Since the seismic observation in deep well began operation at Huaian Seismic Station in May of 1989, the observation have been operated for many years. It is found that the magnitude and epicenter position of earthquakes determined by the borehole seismic record at Huaian station are different from those determined by the seismic network of Jiangsu Province. With the propagation theory of seismic wave, we analyzed the factors related with the magnitude and position deviation. Based on the statistics of many observation data, we found the magnitude (M_L) obtained from borehole seismic observation at Huaian is 0.36 lower than the average value reported by the network of Jiangsu Province, while the position deviation is 51.3°(rotating counter clockwise). The monitor capability of the Huaian Seismic Station is also examined. It is found that the theoretical monitor capability of borehole seismic observation is about 0.21 magnitudes (M_L) higher than the practical. It is also indicated by our research that the magnitude deviation is decreasing whit the increasing of epicenteral station and varies with azimuth.
Since the seismic observation in deep well began operation at Huaian Seismic Station in May of 1989, the observation have been operated for many years. It is found that the magnitude and epicenter position of earthquakes determined by the borehole seismic record at Huaian station are different from those determined by the seismic network of Jiangsu Province. With the propagation theory of seismic wave, we analyzed the factors related with the magnitude and position deviation. Based on the statistics of many observation data, we found the magnitude (M_L) obtained from borehole seismic observation at Huaian is 0.36 lower than the average value reported by the network of Jiangsu Province, while the position deviation is 51.3°(rotating counter clockwise). The monitor capability of the Huaian Seismic Station is also examined. It is found that the theoretical monitor capability of borehole seismic observation is about 0.21 magnitudes (M_L) higher than the practical. It is also indicated by our research that the magnitude deviation is decreasing whit the increasing of epicenteral station and varies with azimuth.
引文
樊映川.1964.高等数学讲义[M]·北京:人民出版社
国家地震局地球物理研究所.1978.近震分析[M]·北京:地震出版社
仇中阳,钱淮云.1999.淮阴地区测震台网监测能力分析[J].地震学刊,(3):21~29
张少泉.1990·深井观测地震波典形记录与分析应用[M].北京:地震出版社
国家地震局地球物理研究所.1978.近震分析[M]·北京:地震出版社
仇中阳,钱淮云.1999.淮阴地区测震台网监测能力分析[J].地震学刊,(3):21~29
张少泉.1990·深井观测地震波典形记录与分析应用[M].北京:地震出版社
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