Pure and Applied Geophysics

, Volume 174, Issue 6, pp 2401–2410 | Cite as

Reducing False Alarms of Annual Forecast in the Central China North–South Seismic Belt by Reverse Tracing of Precursors (RTP) Using the Pattern Informatics (PI) ‘Hotspots’

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Abstract

The annual consultation on the likelihood of earthquakes in the next year, the ‘Annual Consultation Meeting’, has been one of the most important forward forecast experiments organized by the China Earthquake Administration (CEA) since the 1970s, in which annual alarm regions are identified by an expert panel considering multi-disciplinary ‘anomalies’. In such annual forecasts, one of the problems in need of further technical solution is its false alarms. To tackle this problem, the concept of ‘reverse tracing of precursors (RTP)’ is used to the annual consultation, as a temporal continuation and spatial extension of the work of Zhao et al. (Pure Appl Geophys 167:783–800, 2010). The central China north–south seismic belt (in connection to the CSEP testing region) is selected as the testing region of such an approach. Applying the concept of RTP, for an annual alarm region delineated by the Annual Consultation Meeting, the distribution of ‘hotspots’ of the pattern informatics (PI), which targets the 5-year-scale seismic hazard, is considered. The ‘hit’, or successful forecast, of the annual seismic hazard is shown to be related to the sufficient coverage of the ‘hotspots’ within the annual alarm region. The ratio of the areas of the ‘hotspots’ over the whole area of the annual alarm region is thus used to identify the false alarms which have few ‘hotspots’. The results of the years 2004–2012 show that using a threshold of 17 % can reduce 34 % (13 among 38) of the false alarms without losing the successful hit (being 6 in that period).

Keywords

Annual consultation false alarm reverse tracing of precursors (RTP) pattern informatics (PI) hotspots the central China north–south seismic belt 

Notes

Acknowledgments

Thanks to Prof. J.B. Rundle and Prof. C.C. Chen, for guidance and helps in the PI calculation, to Dr. J.C. Zhuang for helpful discussion in revising the manuscript, and to the China Earthquake Networks Center (CENC) for providing the earthquake catalogue and the data of the Annual Consultation. Thanks are also to Prof. X.C. Yin and Prof. Y.X. (Angie) Zhang for invitation to participate in the 2015 ACES Workshop in Chengdu, and to the CSEP-China project for financial support.

Supplementary material

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Supplementary material 1 (DOCX 1789 kb)

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Copyright information

© Springer International Publishing 2016

Authors and Affiliations

  • Shengfeng Zhang
    • 1
    • 2
  • Zhongliang Wu
    • 1
  • Changsheng Jiang
    • 1
  1. 1.Institute of GeophysicsChina Earthquake AdministrationBeijingChina
  2. 2.Earthquake Administration of Shandong ProvinceJinanChina

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