2013/01/31 by K. Eftaxias, S. M. Potirakis
Biochemistry, Genetics and Molecular Biology · Earth and Planetary Sciences · Physics and Astronomy · #Aftershock #Current (fluid) #Earthquake Detection and Analysis #Fracture (geology) #Geodetic datum #Geomagnetism and Paleomagnetism Studies #Geophysical and Geoelectrical Methods #Phase (matter) #Process (computing) #Traceability #cond-mat.mtrl-sci #physics.geo-ph
paper · pdf · doi:10.5194/npg-20-771-2013
published as Nonlin. Processes Geophys., 20, 771-792, 2013
arxiv created 2013/08/13 · openalex publication_date 2013/10/17 · arxiv updated 2014/01/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract. Are there credible electromagnetic (EM) potential earthquake (EQ) precursors? This a question debated in the scientific community and there may be legitimate reasons for the critical views. The negative view concerning the existence of EM potential precursors is enhanced by features that accompany their observation which are considered as paradox ones, namely, these signals: (i) are not observed at the time of EQs occurrence and during the aftershock period, (ii) are not accompanied by large precursory strain changes, (iii) are not accompanied by simultaneous geodetic or seismological precursors and (iv) their traceability is considered problematic. In this work, the detected candidate EM potential precursors are studied through a shift in thinking towards the basic science findings relative to granular packings, micron-scale plastic flow, interface depinning, fracture size effects, concepts drawn from phase transitions, self-affine notion of fracture and faulting process, universal features of fracture surfaces, recent high quality laboratory studies, theoretical models and numerical simulations. We try to contribute to the establishment of strict criteria for the definition of an emerged EM anomaly as a possibly EQ-related one, and to the explanation of potential precursory EM features which have been considered as paradoxes. A three-stage model for EQ generation by means of pre-EQ fracture-induced EM emissions is proposed. The claim that the observed EM potential precursors may permit a real-time and step-by-step monitoring of the EQ generation is tested.