Study on Minimum Integrity Magnitude of Earthquake Catalogue in Jiangsu Seismic Network
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摘要: 区域台网完整性震级的研究对于了解测震台网监测能力、评估地震目录的可靠性以及研究地震活动特征具有重要意义，其有助于确定最小可靠震级范围，并为地震监测和地震研究提供参考。针对江苏及邻区地震目录的特点和需求，结合江苏省区域测震台网台站建设与发展情况，使用震级-序号法、多参数方法联合研究，对江苏区域台网记录的地震活动最小完整性震级
$ M_{\mathrm{C}} $ 随时间的变化趋势进行分析；通过使用完整震级范围(EMR)方法，对地震的空间分布特征进行深入探究。研究结果表明，江苏及邻区整体区域$ {M}_{\mathrm{C}} $ 值变化趋势大致分为2个阶段，1970—2008年$ {M}_{\mathrm{C}} $ 值主要分布于$ {M}_{\mathrm{L}}1.0\mathrm{～}{M}_{\mathrm{L}}2.2 $ 之间，2009—2022年$ {M}_{\mathrm{C}} $ 值主要分布于$ {M}_{\mathrm{L}}0.5\mathrm{～}{M}_{\mathrm{L}}1.5 $ 之间。江苏内陆地区1970—2008年$ {M}_{\mathrm{C}} $ 值主要分布于$ {M}_{\mathrm{L}}1.0\mathrm{～}{M}_{\mathrm{L}}2.5 $ 之间，2009—2022年$ {M}_{\mathrm{C}} $ 值主要分布于$ {M}_{\mathrm{L}}0.5\mathrm{～}{M}_{\mathrm{L}}2.0 $ 之间，江苏沿海黄海海域1970—2022年$ {M}_{\mathrm{C}} $ 值主要分布于$ {M}_{\mathrm{L}}2.0\mathrm{～}{M}_{\mathrm{L}}3.0 $ 之间，江苏区域台网地震监测能力趋于完善。-
关键词:
- 最小完整性震级MC值 /
- 区域地震目录 /
- 江苏省区域测震台网
Abstract: Research on the completeness magnitude (MC) of regional seismic networks is crucial for understanding their monitoring capabilities, assessing the reliability of earthquake catalogs, and studying seismic activity characteristics. This research helps to determine the minimum reliable magnitude range, and provide valuable references for earthquake monitoring and research efforts. In this study, we focus on the earthquake catalog characteristics and requirements for Jiangsu province and its neighboring areas, taking into account the construction and development of seismic stations within the regional seismic network. We employ the magnitude-number method and multi-parameter approaches to investigate and analyze the temporal variations of the minimum completeness magnitude (MC) of seismic activity recorded by this network. Using the Entire Magnitude Range (EMR) method, we further explore the spatial distribution characteristics of earthquakes. Our findings indicate that the overall trend of MC values in Jiangsu and its surrounding areas can be divided into two distinct stages: from 1970 to 2008, MC values predominantly ranged from ML1.0 to ML2.2, while from 2009 to 2022, MC values mainly fell between ML0.5 and ML1.5. Inland areas of Jiangsu Province exhibited MC values ranging from ML1.0 to ML2.5 during the period of 1970—2008, and from ML0.5 to ML2.0 during 2009—2022. In contrast, the MC values in the coastal Yellow Sea area of Jiangsu primarily ranged from ML 2.0 to 3.0 throughout the entire period from 1970 to 2022. Overall, the seismic monitoring capabilities of the Jiangsu regional seismic network appear to be improving over time. -
图 1 江苏及邻区地震M-T（1970—2022年）
Figure 1. The M-T plot of earthquakes in Jiangsu and its adjacent areas （1970—2022）
图 2 江苏及邻区地震年频度N-T（1970—2022年）
Figure 2. The Annual frequency N-T plot of earthquakes in Jiangsu and its adjacent areas （1970—2022）
图 3 江苏及邻区地震分布（1970—2022年）
Figure 3. The distribution of earthquakes in Jiangsu and its adjacent areas （1970—2022）
图 4 江苏省及周边地质分布
Figure 4. Simplified geological map of Jiangsu province and its surrounding areas
图 5 江苏及邻区震级-序号法
$ {M}_{\mathrm{C}} $ 时间演化Figure 5. The time evolution diagram of
$ {M}_{\mathrm{C}} $ value by using magnitude-sequence number method in Jiangsu and its adjacent areas
图 6 不同区域“震级-序号”法
$ M\mathrm{_{C\mathrm{ }}} $ 值时间演化Figure 6. Time evolution diagram of
$ M_{\mathrm{C}} $ value by using magnitude-sequence number method in different regions
图 7 江苏及邻区多参数方法
$ {M}_{\mathrm{C}} $ 值时间演化Figure 7. The time evolution diagram of
$ {M}_{\mathrm{C}} $ value by using multi-parameter method in Jiangsu and its adjacent areas
图 8 不同区域“多参数方法”
$ M\mathrm{_C} $ 值时间演化Figure 8. The time evolution diagram of
$ M_{\mathrm{C}} $ value of ' multi-parameter method ' in different regions
图 9 1970—2022年江苏及邻区
$ {M}_{\mathrm{C}} $ 和$ \mathrm{\Delta }{M}_{\mathrm{C}} $ 空间分布Figure 9. Spatial distribution of
$ {M}_{\mathrm{C}} $ and Δ$ {M}_{\mathrm{C}} $ in Jiangsu and its adjacent areas from 1970 to 2022
图 10 1970—2008年江苏及邻区
$ {M}_{\mathrm{C}} $ 和$ \mathrm{\Delta }{M}_{\mathrm{C}} $ 空间分布Figure 10. Spatial distribution of
$ {M}_{\mathrm{C}} $ and Δ$ {M}_{\mathrm{C}} $ in Jiangsu and its adjacent areas from 1970 to 2008
图 11 2009—2022年江苏及邻区
$ {M}_{\mathrm{C}} $ 和$ \mathrm{\Delta }{M}_{\mathrm{C}} $ 空间分布Figure 11. Spatial distribution of
$ {M}_{\mathrm{C}} $ and Δ$ {M}_{\mathrm{C}} $ in Jiangsu and its adjacent areas from 2009 to 2022表 1 江苏及邻区地震目录
Table 1. Statistics of earthquake catalogues in Jiangsu and its adjacent areas
编号 地震区（带） 地震数量/次 地震区（带）内最大震级/级 1 江苏及邻区整体区域 24 156 6.4 2 江苏内陆陆地整体区域 5 835 6.3 3 黄海海域整体区域 3 009 6.4 4 苏北盆地 1 825 5.4 5 苏南隆起 2 461 6.3 
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