| 内蒙古区域地震台网监测能力研究 |
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| 引用本文： | 刘芳,蒋长胜,张帆,杨彦明,梁莹,王磊,苗春兰.内蒙古区域地震台网监测能力研究[J].地震学报,2014,36(5):919-929. |
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| 作者姓名： | 刘芳 蒋长胜 张帆 杨彦明 梁莹 王磊 苗春兰 |
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| 作者单位： | 1.中国呼和浩特 010051 内蒙古自治区地震局 |
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| 基金项目： | 地震科技星火计划项目(XH12009)、国家国际科技合作专项项目(2012DFG20510)、国家科技支撑计划项目(2012BAK19B01， 2012BAK15B01)和内蒙古自治区科技计划项目(20130437)联合资助. |
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| 摘 要： | 国际上新近发展的“基于概率的完整性震级”(PMC)方法，具有可考察地震定位中由于台站人为选择等造成的台网监测能力下降，以及避免传统基于G-R关系的统计算法因地震数目过少而无法评估等优点.本研究利用PMC方法，计算得到内蒙古区域地震台网39个台站对周边地震事件的检测概率及台网检测概率.单台检测概率结果显示:PMC方法能够客观地反映39个台站对地震事件的检测能力；因台网布局等影响，内蒙古区域地震台网中西部和中东部地区的台站检测能力较强，而靠近蒙古、俄罗斯边境的台站， 阿拉善右旗附近地区的台站，以及邻近吉林、黑龙江等地区的台站检测能力较低.合成检测概率结果显示，由于邻省台站的引入，全区80%的地区基于概率的最小完整性震级MP达到2.2左右，其余地区MP达到3.3左右.为提高地震台网监测能力，建议在监测能力较弱的中蒙交界地区、东北部地区，以及阿拉善左旗以西地区适度加密台站，进一步优化台网布局.
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| 关 键 词： | 内蒙古区域地震台网 最小完整性震级 基于概率的完整性震级方法 |
| 收稿时间： | 2013-11-01 |
A study on detection capability of the Inner Mongolia regional seismic network |
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| Institution: | 1.Earthquake Administration of Inner Mongolia Autonomous Region, Hohhot 010051, China2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China3.China Earthquake Networks Center, Beijing 100045, China |
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| Abstract: | As a new developed method for estimating earthquake detection probabilities, the probability-based magnitude of completeness (PMC) method can avoid decreasing the detection capability resulted by artificial factors, and can access the detection capability in the areas where traditional Gutenberg-Richter relationship-based method is ineffective due to lack of earthquakes. In this study, we determine the detection probability of all 39 stations of the Inner Mongolia seismic network by using the PMC method. The results show that the PMC method can reflect the network earthquake monitoring capacity objectively. The detection probability is better than other regions in the midwestern and the mid-eastern region of Inner Mongolia, due to better coverage of seismic stations, however, it is poor in the Alxa Youqi region, the Sino-Russian border, and Sino-Mongolia border. Synthesized detection probability results indicate that minimum probability-based magnitude of completeness, MP, can reach ML2.2 in the 80% area of the Inner Mongolia when the stations of the neighboring networks are involved, and only about ML3.3 in other areas. In order to enhance the monitoring capacity of Inner Mongolia regional seismic network, more stations are still needed to emplace in the Sino-Mongolia border region, the northeastern region of Inner Mongolia, and to the west of Alxa Zuoqi to optimize the layout of seismic network. |
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