Application of Pd-τc compatibility criterion to distinguishing triggered events
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摘要: 结合福建地区地震预警系统的运行情况和处理能力， 利用日本KiK-net台网和福建地震台网记录的天然地震事件和人工爆破事件实测数据， 探讨了Pd-τc相容性检验方法在触发事件类型实时判别中应用的可行性． 结果表明， Pd-τc相容性检验方法能够较好地区分大震级地方震与误触发事件， 也能对远震事件进行粗略判别， 但对于小震级地方震和人工爆破事件则无法有效判别． 随后， 以Pd-τc相容性检验结果为基础， 本文设定强度参数Pd=10-3 cm为界线， 即可从众多触发事件中甄选出可能产生破坏的大震级地方震事件． 本文方法有助于提高触发事件类型判别结果的可靠性、 预警系统的处理效率和系统产出信息的准确度．Abstract: Combining the operation status of the earthquake early warning (EEW) system in Fujian Province， this paper discusses the feasibility of the Pd-τc compatibility criterion in discrimination of triggered events， based on seismic records of KiK-net in Japan and seismic monitoring networks of Fujian Province， in which both spontaneous earthquakes and artificial explosion events are included. The results show that， for large local earthquakes and false triggering events， Pd-τc criterion is quite reliable with less error. Also， teleseismic earthquake events may be roughly judged by the criterion. But artificial explosions and/or small magnitude local earthquakes cannot be effectively distinguished only by this criterion. Furthermore， based on the Pd-τc compatibility test results， this paper sets an intensity test standard by the parameter Pd=10-3 cm， by which those destructive earthquakes can be identified more accurately. The present method will help to improve the reliability of triggered events discrimination， promote processing efficiency of the whole EEW system， eventually generate more accurate seismic alert message.
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图 1 Pd-τc相容性检验关系推导示意图
(a)Pd随震中距R及τc的衰减;(b)Pd-τc相容性检验关系(实线)及扩展控制线(虚线)
Figure 1. Schematic diagram of derivation of Pd-τc compatibility relations
(a)Pd attenuates with epicentral distance R and τc value;(b)Pd-τc compatibility test relations(solid lines)and extension control lines(dashed lines)
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图 2 本文研究所使用地震事件分布情况
(a)日本KiK-net台网116次事件分布；(b)福建省及周边地区1546次事件分布
Figure 2. Distribution of earthquake events used in this study
(a)Distribution of 116 events recorded by KiK-net；(b)Distribution of events within and beyond Fujian Province，where red dots and blue plus signs represent spontaneous earthquakes within and beyond Fujian Province，respectively，and green crosses represent artificial explosion events in Fujian Province
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图 3 基于不同事件类型的Pd-τc相容性分析结果
(a)KiK-net台网事件;(b)福建省及其周边地区小震级天然地震事件;(c)台湾及其周边地区天然地震事件;(d)福建省及其周边人工爆破事件；(e)模拟误触发事件
Figure 3. Test results of Pd-τc compatibility criterion based on different types of events
(a)KiK-net events;(b)Earthquake events with small magnitude within Fujian Province and its vicinity; (c)Earthquake events within Taiwan region and its vicinity;(d)Artificial explosion events within Fujian Province and its vicinity;(e)Simulated false trigger events
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图 4 宫城岩手县Mj7.2地震不同震中距R台站的Pd-τc相容性分析结果
Figure 4. Pd-τc compatibility test results based on the records of the Mj7.2，Iwate-Miyagi，earthquake from the stations with different epicentral distance R
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