Monitoring Capacity of Seismic Network in Inner Mongolia Region Based on EMR Method
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摘要: 为考察内蒙古及邻区地震监测能力的时空分布特征，并为该地区的地球科学研究和测震台网的进一步优化布局提供科学参考，根据内蒙古测震台网发展的各历史阶段，分析了地震定位台站数据和台站张角的时空分布，并采用完整性震级范围(EMR)方法，研究了最小完整性震级Mc的时空分布特征.结果表明，台站张角和台站数的时空演化能够定性、客观地反映内蒙古测震台网台站数量由少到多，地震监测能力由弱到强逐步完善的发展过程.而EMR方法给出的Mc时空分布，可定量描述内蒙古测震台网各历史时期Mc时空的监测能力变化.结果显示，1990—2001年的模拟记录期间，呼和浩特地区Mc值约为ML2.0，与蒙古交界地区可达ML3.0以上.2002—2007年的模拟和数字化并行期间，内蒙古中西部以及与外省交界地区监测能力有所提升.2008—2012年的“十五”数字台网运行期间，测震台网的建设有效克服了行政区划狭长、台站布局不合理的现状，绝大多数地区ML2.2以上地震基本完整.相关研究将为内蒙古地区地震观测系统的进一步优化布局、地震观测产品用于地震预测预报研究和地震危险性分析提供重要的参考依据.Abstract: In this paper monitoring capacity of Inner Mongolia seismic network is evaluated, aiming at offering information for scientific layout of seismic stations. We analyze the temporal and spatial character of record stations number, maximum station coverage azimuth and minimum magnitude of completeness (Mc) based on the observation reports and catalogues in Inner Mongolia regions. The results reflect the development of the monitoring capacity. The Mc in Hohhot region was around ML2.0 and over ML3.0 in the juncture of Mongolia and Inner Mongolia during "analogy" era (1990-2001). The monitoring capacity has been improved in the Midwest of Inner Mongolia region and the adjacent areas during "analogy digital parallel" era (2002-2007), with Mc reaching as low as ML2.2 in most of Inner Mongolia and its adjacent areas during "digital" era and the 10th five-year project period (2008-2012) because the layout of stations is more reasonable and the influence of long narrow region shape has been overcome. This study facilitates the future seismic activity analysis and the seismic hazard assessment in this region.
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Key words:
- Inner Mongolia /
- seismic network /
- magnitude /
- entire-magnitude range (EMR) /
- earthquakes /
- seismology
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图 1 1972-2012年内蒙古台网台站数随时间变化曲线
Fig. 1. The curve of numbers of earthquake stations variation with time
图 2 1976-2012年内蒙古测震台网台站分布和ML0.0以上地震的空间分布
Fig. 2. The distribution of earthquake and seismic stations in Inner Mongolia and adjacent areas
图 3 1976-2012年内蒙古测震台网记录地震事件的台站最大张角α≤180°随时间变化(不同颜色代表相应震级档α≤180°地震事件比例)
Fig. 3. The change of maximum station coverage azimuth (α≤180°) with time (1976-2012)
图 4 不同阶段内蒙古测震台网台站张角α≤180°的空间分布(图中不同颜色α≤180°的地震事件比例)
a.1976-2001年；b.2002-2007年；c.2008-2012年
Fig. 4. The spatial distribution of station coverage azimuth (α≤180°) at different stages
图 5 内蒙古测震台网不同阶段震级与定位所用台站数的分布关系
a.1976-2001年；b.2002-2007年；c.2008-2012年
Fig. 5. The relationship between the magnitude and the number of used stations at different stages
图 6 内蒙古测震台网1976-2012年各震级档定位台站数均值随时间的变化
图中色差为所在时间段、相应震级档定位台站数均值，空白格点为定位台站≤3个
Fig. 6. The change of average number of used stations with time
图 7 内蒙古及邻区地震目录最小完整性震级Mc分析
图中分别给出了累积和非累积的震级-频度分布，以及相应的理论拟合结果.黑色倒三角箭头标出了Mc的位置，子图中给出了EMR方法参数的最大似然估计值(MLE)在ML0.6~2.5之间的变化情况
Fig. 7. Inner Mongolia and adjacent areas catalogue completeness minimum magnitude (Mc) analysis
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