中国地震台网中心震源机制产出系统2022—2023年产出情况

Production Review of the China Earthquake Networks Center Focal Mechanism Output System from 2022 to 2023

摘要:

震源机制解是描述震源特性的重要参数,对了解地震断层的运动方式和动力学机制等具有重要作用。目前中国地震台网中心具备自主产出全球M≥6.0和中国台站密集地区M≥4.0地震震源机制解的能力,其通过全球GSN共享台和中国区域测震台采用多种反演方法产出,根据不同需求分别产出自动结果和人工复核结果,产出时效性强,目录完整性高。本文介绍了震源机制产出系统主要流程,展示了2022年1月—2023年12月自动产出结果527个和人工复核结果261个,并将产出结果进行可靠性分析和评价,表明了中国地震台网中心震源机制结果目录的稳定性和准确性。本文还对比了自动产出结果与人工复核结果,验证了自动产出结果具有较高的可靠性。自动产出结果对震后快速响应、震源破裂过程产出、应急会商等具有重要意义,人工复核结果可为孕震机理研究、区域应力场研究等提供帮助。

Abstract:

The focal mechanism solution is a crucial parameter for characterizing seismic sources,as it plays a significant role in understanding the motion mode and dynamic mechanisms of seismic faults. Currently,the China Earthquake Networks Center(CENC)is capable of independently producing focal mechanism solutions for earthquakes with magnitudes M≥6.0 in the world and M≥4.0 within China,utilizing a dense network of domestic stations. Through a variety of inversion methods,the CENC generates both automatic and manually rechecked results,leveraging global GSN(Global Seismographic Network)shared stations and domestic regional seismic stations. This system ensures strong timeliness and high catalog integrity. This paper outlines the main processes of the focal mechanism output system and presents the results from January 2022 to December 2023,including 527 automatic outputs and 261 manually rechecked results. A reliability analysis and evaluation of these outputs are conducted,confirming the stability and accuracy of the CENC's central catalog of focal mechanism results. Furthermore,the study compares the automatic output results with the manually reviewed results,verifying the high reliability of the automatic system. The automatic output of focal mechanism results holds significant value for post-earthquake rapid response,earthquake source rupture process modeling,and emergency consultations. Meanwhile,the manually rechecked results provide valuable support for scientific disciplines such as earthquake mechanism research and regional stress field studies.