| 甘肃测震台网监测能力及地震目录完整性分析 |
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| 引用本文： | 冯建刚,蒋长胜,韩立波,陈继锋.甘肃测震台网监测能力及地震目录完整性分析[J].地震学报,2012,34(5):646-658. |
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| 作者姓名： | 冯建刚 蒋长胜 韩立波 陈继锋 |
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| 作者单位： | 1) 中国兰州730000中国地震局兰州地震研究所 2) 中国北京 100081 中国地震局地球物理研究所 |
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| 基金项目： | 地震科技星火计划(XH1026Y);国家科技支撑计划课题(2012BAK15B01)联合资助 |
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| 摘 要： | 区域地震台网监测能力的科学评估，是进行区域地震活动性和地震危险性分析的重要基础，最小完整性震级Mc是表征台网监测能力的关键．本文以甘肃测震台网的地震观测报告和区域地震目录为基础资料，分析了甘肃及邻区地震监测能力在时、空上的分布特征，利用ldquo;震级 序号rdquo;法、ldquo;最大曲率rdquo;法(MAXC)、拟合度分别为90%和95%的拟合优度检验法(GFT)及ldquo;完整性震级范围rdquo;法（EMR）等，研究了甘肃区域地震目录最小完整性震级Mc的时、空分布特征．结果表明，1980年以来甘肃测震台网的地震监测能力得到了逐步提高，模拟记录时期和ldquo;九五rdquo;期间甘东南地区的地震监测能力明显高于祁连山地震带中西段，ldquo;十五rdquo;测震台网运行后，甘肃及邻区的地震监测能力的空间差异明显缩小．最小完整性震级Mc和监测能力的时空分布特征具有较好的一致性．随着台网的改造，Mc逐步降低，ldquo;十五rdquo;台网运行后，甘肃及邻区的ML1.8以上地震基本完整．此外，还讨论了相关技术规范对区域台网地震目录的影响，并且提出了消除该影响的科学途径和有效方法．该研究结果可为甘肃及邻区地震活动性分析和地震危险性评价等相关研究提供参考．
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| 关 键 词： | 完整性震级Mc 震级-频度分布 甘肃测震台网 完整性震级范围 |
Analysis on the monitoring capability of seismic networks and completeness of earthquake catalogues in Gansu region |
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| Feng Jiangang
,
Jiang Changsheng
,
Han Libo
,
Chen Jifeng.Analysis on the monitoring capability of seismic networks and completeness of earthquake catalogues in Gansu region[J].Acta Seismologica Sinica,2012,34(5):646-658. |
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| Authors: | Feng Jiangang Jiang Changsheng Han Libo Chen Jifeng |
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| Institution: | 1) Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China2) Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | The minimum magnitude of completeness(Mc) in earthquake catalogues,which reflects the monitoring capability,plays an important role in studying seismicity and assessing seismic hazards.Based on the observation bulletins and earthquake catalogues in Gansu region,we analyzed temporal and spatial variation of seismic network monitoring capability by using magnitude-order number,maximum curvature(MAXC),goodness-of-fit test(GFT) and entire magnitude range(EMR) methods.The results show that the monitoring capability has been significantly improved since 1980.The monitoring capability in the southeastern region of Gansu was considerably better than that in Qilian seismic belt during the "analog" recording period and the "9th Five-Year Plan" period.During the "10th Five-Year Plan" period(2001—2005),the spatial differences in earthquake monitoring capability near Gansu and its adjacent areas were significantly decreased.The spatial and temporal distribution of Mc is consistent with that of the monitoring capability.With the upgrading of seismic stations,the minimum magnitude is gradually lowered.Mc could reach as low as ML1.8 in Gansu and its adjacent areas during the "10th Five-Year Plan" period.In addition,we also discuss the effect of relevant provisions on regional earthquake catalogues and propose a way to eliminate the effect.The results can provide references for analyzing seismic activity and assessing seismic hazards in this region. |
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| Keywords: | minimum magnitude of completeness magnitude-frequency relation Gansu seismic network EMR |
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