地震目录数据是当前进行地震预测预报及危险性分析的重要资料,而反映地震目录质量水平的最小完整性震级评估又是开展这些工作的重要基础。整理黑龙江省及邻区(42°—54°N,120°—136°E)1970—2022年地震目录,应用震级—序号法分析地震密度随时间的演化特征,同时应用多参数方法,即拟合度分别为90%和95%的拟合优度检测法,分析最小完整性震级的时序演化特征。结果显示:1970—1983年,研究区由于地震台站数量较少,Mc评估结果约为ML 3.0—2.5;1984—2006年,地震台站运行较稳定,地震台网监测能力有所提高,Mc评估结果约为ML 2.5—2.0;2007—2022年,经“十五”数字地震观测网络项目升级和改造,地震台网监测能力提升,Mc稳定在ML 2.0—1.5。
The earthquake catalog is a crucial source of information for earthquake forecasting and risk analysis, and the minimal completeness magnitude evaluation that reflects the catalog’s degree of quality serves as a crucial foundation for these efforts. In this study, the earthquake catalog from Heilongjiang Province and surrounding areas (42°-54°N, 120°-136°E) from January 1970 to December 2022 was organized, and the magnitude-sequence number method and multiparameter method were used to analyze the temporal evolution characteristics of the minimum coMLeteness magnitude. According to the findings, the small number of seismic stations in the study area between 1970 and 1983 caused the Mc assessment result to be about ML 3.0-2.5; during the stable analog observation period from 1984 to 2006, the seismic monitoring capability was improved, and the Mc assessment result was about ML 2.5-2.0; and from 2007 to 2022, the upgrade and transformation of “the tenth five-year plan” digital seismic observation network project was carried out, and the Mc was stable at ML 2.0-1.5.
2024,45(5): 34-39 收稿日期:2023-4-11
DOI:10.3969/j.issn.1003-3246.2024.05.005
基金项目:吉林长白山火山国家野外科学观测研究站项目(项目编号:NORSCBS21-08);黑龙江省地震局局内科研课题(项目编号:202312)
作者简介:马艳丽(1985-),女,工程师,主要从事地震大形势分析研究工作。E-mail:alicema816@126.com“
*通讯作者:”张盛峰(1988-),男,副研究员,主要从事地震预测预报研究工作。E-mail:zsf@ief.ac.cn
参考文献:
董俊,肖孟仁,晏绮云,等. 江西地区地震目录最小完整性震级研究[J]. 国际地震动态,2018,(9):16-21.
杜国林,于露,韦庆海. 绥化及周边地区地震活动特征研究[J]. 东北地震研究,2000,16(4):23-28.
高家乙,闫睿,谢健健. 河南地区地震目录最小完整性震级探讨[J]. 地震地磁观测与研究,2021,42(5):21-25.
韩立波,蒋长胜,李艳娥,等. 用于地震可预测性CSEP计划的南北地震带地区地震最小完整性震级Mc研究[J]. 地震,2012,32(1):17-27.
李志海,蒋长胜,黄瑜,等. 新疆地区地震目录最小完整性震级和台网科学布局研究[J]. 地震学报,2011,33(6):763-775.
刘丽芳,李志海,蒋长胜. 云南地区地震目录最小完整性震级研究[J]. 地震研究,2012,35(4):491-499.
闵伟,焦德成,周本刚,等. 依兰-伊通全新世活动的新发现及其意义[J]. 地震地质,2011,33(1):141-150.
吴宝峰,闫峰. 黑龙江省“九五”与“十五”测震台网理论最小监测能力的对比[J]. 地震地磁观测与研究,2008,29(3):51-53.
余娜,张晓清,杨晓霞. 青海及邻区地震目录最小完整性震级分析[J]. 地震,2020,40(4):23-32.
Gutenberg B, Richter C F. Frequency of earthquakes in California[J]. Bull Seismol Soc Am, 1944, 34(4): 185-188.
Ogata Y, Imoto M, Katsura K. 3-D spatial variation of b-values of magnitude-frequency distribution beneath the Kanto District, Japan[J]. Geophys J Int, 1991, 104(1): 135-146.
Rydelek P A, Sacks I S. Testing the completeness of earthquake catalogues and the hypothesis of self-similarity[J]. Nature, 1989, 337(6 204): 251-253.
Taylor D W A, Snoke J A, Sacks I S, et al. Nonlinear frequency-magnitude relationships for the Hokkaido Corner, Japan[J]. Bull Seismol Soc Am, 1990, 80(2): 340-353.
Wiemer S, Wyss M. Minimum magnitude of completeness in earthquake catalogs: Examples from Alaska, The western United States, and Japan[J]. Bull Seismol Soc Am, 2000, 90(4): 859-869.