Analysis of Monitoring Capability of Jiangsu Seismic Network Based on PMC Method
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摘要: 江苏测震台网经近20年的高速发展，已拥有75个数字测震台站，针对江苏台网监测能力的评估需求，同时为进一步优化台网布局，提高江苏测震台网监测能力提供参考意见，本文使用基于概率的完整性震级方法，利用江苏台网2009—2021年正式编目观测报告数据，对江苏台网进行监测能力评估。研究结果表明，江苏台网监测能力较好的地区为北部连云港周边地区，监测能力达到了
$ {M}_{\mathrm{L}}\geqslant 1.0 $ ；其次为南部南京、镇江、常州及周边地区，监测能力达到了$ {M}_{\mathrm{L}}\geqslant 1.5 $ ；监测能力较差的地区为中部地区及近海海域，监测能力达到了$ {M}_{\mathrm{L}}\geqslant 2.0 $ 。整个江苏台网基本实现了$ {M}_{\mathrm{L}}\geqslant 2.0 $ 的监测能力，周边地区及中部近海海域基本实现了$ {M}_{\mathrm{L}}\geqslant 2.5 $ 的监测能力。-
关键词:
- 江苏测震台网 /
- 监测能力评估 /
- 完整性震级PMC方法
Abstract: After nearly two decades of rapid development, the Jiangsu Seismic Network has expanded to include 75 digital seismic stations. This study aims to evaluate the monitoring capabilities of the Jiangsu network and provide recommendations for optimizing the network layout and improving its monitoring effectiveness. The evaluation utilizes the Probability-based Magnitude of Completeness (PMC) method and examines the official cataloged observation report data from 2009 to 2021. The research findings indicate variations in monitoring capabilities across different regions of the Jiangsu network. The northern regions, particularly around Lianyungang, exhibit relatively robust monitoring capabilities, with a threshold of$ {M}_{{\rm{L}}} $ ≥1.0. The southern regions, including Nanjing, Zhenjiang, Changzhou, and the surrounding areas, demonstrate relatively stronger monitoring capabilities, reaching approximately$ {M}_{{\rm{L}}} $ ≥1.5. The central regions and nearshore areas exhibit lower monitoring capabilities, with a threshold of$ {M}_{{\rm{L}}} $ ≥2.0. Overall, the entire Jiangsu network has achieved a satisfactory level of monitoring capabilities for$ {M}_{{\rm{L}}} $ ≥2.0, while the surrounding areas and central nearshore regions have achieved a higher level of seismic monitoring capabilities, reaching$ {M}_{{\rm{L}}} $ ≥2.5. -
图 1 江苏及共享的邻省地震台站和2009—2021年震中分布
Figure 1. Distribution of seismic stations of Jiangsu and adjacent provinces and earthquakes occurred during 2009—2021
图 2 连云港台单台监测概率分布
Figure 2. Probability diagram of single station monitoring of Lianyungang station
图 3 盐城台单台监测概率分布
Figure 3. Probability diagram of single station monitoring of Yancheng station
图 4 南京台单台监测概率分布
Figure 4. Probability diagram of single station monitoring of Nanjing station
图 5
$ {P}_{\mathrm{E}} $ 与$ {M}_{\mathrm{P}} $ 空间分布Figure 5. Composite detection probability
$ {{P}}_{\mathrm{E}} $ distribution map and$ {{M}}_{\mathrm{P}} $ spatial distribution map表 1 江苏台网典型台站单台检测概率
Table 1. Statistical table of single station detection probability of typical stations of Jiangsu network
台站名称/代码 L/km
（ML=1.0、PD=100%）ML/级
（L=100 km、PD=100%）L/km
（ML=3.0、PD=100%）ML/级
（L=250 km、PD=100%）噪声级别 台基
类型常熟/CS 40 1.6 150 3.5 Ⅱ 石英砂岩 常州/CZ — 1.4 150 — Ⅲ 混合花岗岩 邳州/PZ — 1.7 150 3.8 Ⅱ 石英砂岩 徐州/XZ — 2.7 150 — Ⅰ 灰岩 东海/DH 20 1.8 150 3.5 Ⅰ 混合花岗岩 赣榆/GAY 30 1.4 150 3.3 Ⅰ 混合岩 高淳/GC 30 1.6 150 3.5 Ⅰ 紫红长石砂岩 灌云/GUY 50 2.0 150 3.2 Ⅰ 花岗片麻岩 镇江/ZJ — 2.1 150 — Ⅱ 砂岩 江宁/JN — 3.4 90 3.5 Ⅱ 砂岩 浦口/PK — — 50 — Ⅲ 灰岩 靖江/JJ — 3.1 20 — Ⅲ 石英砂岩 金坛/JT — 4.6 50 — Ⅱ 砂岩 溧水/LIS 20 2.1 150 3.6 Ⅱ 片麻岩 泗洪/SH — 2.0 150 3.3 Ⅱ 安山岩 宿迁/SQ — 2.4 150 3.6 Ⅱ 安山凝灰岩 —锡/WX 20 1.7 150 3.5 Ⅱ 石英砂岩 新沂/XIY 20 2.2 150 3.3 Ⅱ 砂岩 徐圩/XW 20 2.4 150 3.7 Ⅱ 花岗片麻岩 盱眙/XY — 1.9 100 3.7 Ⅰ 灰岩 大丰（井下）/DF — — — — Ⅲ 松散沉积层 高邮（井下）/GY — 3.9 20 — Ⅱ 松散沉积层 海安（井下）/HA — 3.2 30 — Ⅱ 松散沉积层 淮安（井下）/HUA — 2.5 150 — Ⅱ 松散沉积层 涟水（井下）/LIS — — 30 — Ⅱ 石英岩 溧阳（井下）/LY 10 2.0 150 — Ⅰ 安山玄武岩 南通（井下）/NT — — 10 — Ⅱ 石英砂岩 沛县（井下）/PX — 2.4 50 — Ⅱ 石英砂岩 启东（井下）/QD — — — — Ⅱ 混合花岗岩 如东（井下）/RD — — 50 — Ⅱ 灰岩 射阳（井下）/SY — — 20 — Ⅲ 松散沉积层 泰州（井下）/TZ — 2.9 130 — Ⅲ 沉积岩 兴化（井下）/XH — — — — Ⅲ 混合花岗岩 盐城（井下）/YC — — 60 — Ⅱ 松散沉积层 阳光岛（井下）/YGD — — — — Ⅱ 基岩 宝应（井下）/BY — 3.1 40 — Ⅱ 石英砂岩 昆山/KS — 2.5 150 — Ⅲ 灰岩 六合/LH — 2.7 150 — Ⅰ 白云岩 前三岛/QSD — — — — Ⅱ 片麻岩 宜兴/YX — 2.5 150 — Ⅰ 砂岩 南京/NJ2 — 1.9 150 3.3 Ⅱ 安山玄武岩 连云港/LYG 40 1.7 150 3.1 Ⅰ 片麻岩 
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