南中国海区域海啸预警中心地震监测系统

徐志国; 史健宇; 李宏伟; 王宗辰

doi:10.19987/j.dzkxjz.2022-053

南中国海区域海啸预警中心地震监测系统

doi: 10.19987/j.dzkxjz.2022-053

国家海洋环境预报中心，北京 100081

基金项目: 自然资源部“中印尼海洋与气候中心发展”项目（2029999001）资助。

详细信息

作者简介:
徐志国（1979-），男，高级工程师，主要从事地震学与海啸预警技术研究。E-mail：xuzhg04@sina.com

通讯作者:
史健宇（1991-），男，工程师，主要从事地震监测与海啸预警预报工作。E-mail：shijy@nmefc.cn

中图分类号: P315.61
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- HTML全文浏览量: 111
- PDF下载量: 29
出版历程
- 收稿日期: 2022-03-24
- 修回日期: 2022-04-25
- 网络出版日期: 2022-07-10

The earthquake monitoring system in the South China Sea Tsunami Advisory Center

National Marine Environmental Forecasting Center, Beijing 100081, China

摘要

摘要: 简要介绍了南中国海区域海啸预警与减灾系统的建设和发展历程，同时重点阐述了地震监测系统构成及其基本功能。作为重要组成部分，地震监测系统通过地震数据的实时汇集、存储、自动处理和分析，并结合人机交互方式实现了地震定位、震源机制解和有限断层模型反演。实际应用表明，地震监测系统对全球6.0级以上地震定位时间不超过8 min，在震后10—15 min内完成W震相方法快速反演海底强震震源机制解，在震后短时间内完成有限断层模型反演，为海啸预警提供快速、准确、可靠的地震基本参数和震源特征参数。
- 南中国海区域 /
- 海啸预警 /
- 地震基本参数 /
- 震源机制解 /
- 有限断层模型
Abstract: This paper briefly reviewed the initiation steps and developments of the South China Sea Region Tsunami Warning and Mitigation Systems. In addition, we highlighted the structure and basic functions of the earthquake monitoring and processing system of the Tsunami Warning Systems, such as earthquake location, source mechanism solution and finite fault model inversion using the real-time seismic waveform data from regional and global seismographic networks, that will result in the rapid source parameters estimation for a larger earthquake in tsunami warning. Numerous simulations and hands-on events have shown that the preliminary earthquake parameters could be determined in less than 8 minutes after earthquake. The W-phase method is able to produce rapid and reliable estimation of the moment magnitude and source mechanism for larger events within 10—15 minutes after the earthquake. A finite fault model can be acquired after the earthquake event via computing teleseismic body-wave inversion program. The earthquake monitoring and processing system provide accurate and reliable information in contributing to tsunami warning services.
- South China Sea region /
- tsunami warning /
- basic earthquake parameters /
- focal mechanism solution /
- finite fault model

HTML全文

图 1 南中国海区域海啸预警中心预警责任区

Figure 1. The areas of responsibility for tsunami warning service of the South China Sea Tsunami Advisory Center

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图 2 全球和区域地震台网

Figure 2. The global and regional seismic networks

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图 3 2019年1—12月全球6级以上地震震源机制解。黑色线为全球主要板块边界^[17]

Figure 3. The focal mechanism solutions of global earthquakes with M＞6.0 from January to December 2019. The black lines are the boundaries of major plates in the world^[17]

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图 4 马鲁古海地震震中位置和震源机制解

Figure 4. The epicenter location and focal mechanism solutions of Molucca Sea earthquake

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图 5 马鲁古海地震有限断层模型

Figure 5. Finite fault model of the Molucca Sea earthquake

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表 1 SCSTAC震后不同时间得到的马鲁古海M_W7.1地震震源参数

Table 1. The source parameters of the M_W7.1 Molucca Sea earthquake determined by SCSTAC at different time after origin time

震后时间 /min	节面Ⅰ			节面 Ⅱ			深度/km	M_W	台数	沙滩球
震后时间 /min	走向角 /°	倾角 /°	滑动角 /°	走向角 /°	倾角 /°	滑动角 /°	深度/km	M_W	台数	沙滩球
8	219	48	107	14	45	72	23.5	7.1	10
10	225	45	116	10	51	67	23.5	7.1	16
12	221	49	109	14	45	70	23.5	7.1	35
15	217	52	102	17	40	75	23.5	7.1	60

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