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江苏数字地震台网台站震级偏差的分析
Analysis on the magnitudes determined by the substations of Jiangsu digital seismic network
- DOI:
- 作者:
- 詹小艳 王俊 缪发军 孙业君 郑江蓉 徐戈
- 作者单位:
- 中国南京 210014 江苏省地震局
- 关键词:
- 江苏数字台网;数字地震台;震级偏差
Jiangsu digital seismic network, digital seismic station, magnitude deviation
- 摘要:
- 利用江苏数字地震台网1999年1月1日—2008年12月31日3个以上子台记录到的约1 500条地震，以台网的平均震级为标准震级，详细分析了江苏数字台网子台的震级偏差原因，结果显示：①在震中距较小时(＜100 km),子台测定的震级偏小，在100 km＜Δ＜250 km范围内，震级偏差基本为零；②子台测定的震级偏差存在地域分布特征，随方位角显示趋势性变化，地区邻近的子台之间变化特征相近或相似；③江苏数字台网子台台基类型中松散沉积对震级影响最大，偏差均为正值，最大偏差约0.3级,灰岩类型的台基对震级测定影响最小，几乎为零。
In this paper, about 1 500 earthquake events recorded by Jiangsu digital seismic network from Jan 1,1999 to Dec 31,2008 were selected, taking the average magnitude as standard magnitude, for analyzing the reason of magnitude deviation of the substations in Jiangsu digital seismic network. The result shows：①The magnitude measured by the substations is smaller when the epicentral distance is smaller (<100 km), when 100 km<Δ<250 km, magnitude deviation is basically equal to zero; ②The magnitude deviation measured by the substations has a regional distribution, and has a trend variation with seismic azimuth. The changing characteristics of adjacent substations are similar; ③Soft sediments have great impact on magnitude, with positive deviation; The impact of limestone is smallest.
