Multiple seismo-anomalies associated with the M6.1 Ludian earthquake on August 3, 2014

Xiaoping Zeng, Yunfang Lin, Weisheng Chen, Zhiqiang Bai, Jann Yenq Liu, Chieh Hung Chen

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11 Scopus citations


Multiple geophysical parameters including groundwater level, water temperature, water radon, crustal deformation, electromagnetic waves and total electron contents (TEC) in the ionosphere, are examined together to investigate pre-earthquake anomalous phenomena associated with the Mw6.1 Ludian earthquake on August 3, 2014. Cross-parameter comparison eliminates anomalies that are detected in one parameter only and examine earthquake-related phenomena in various fields, simultaneously. Retrieved anomalies show that abnormal decreases of water temperature and radon concentration related to anomalous uplift of groundwater levels appeared about 1-8 days before the earthquake even without contributions from rain. Significant step-like changes are observed from data recorded by strainmeters on July 31 and are consistent with water-related anomalies in timing. No significant anomalies can be found from electromagnetic data through the preliminary observation. In contrast, TEC appeared positive anomalies 1-3 days before the Ludian earthquake. Although causal mechanisms of the TEC anomalies from stressed rocks are not fully understood, multiple-parameter examination can increase credibility of determination regarding pre-earthquake phenomena.

Original languageEnglish
Pages (from-to)352-361
Number of pages10
JournalJournal of Asian Earth Sciences
StatePublished - 15 Dec 2015


  • Earthquake forecast
  • Electromagnetic field
  • Groundwater
  • Radon
  • Total electron content
  • Water temperature


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