Abstract
Recently, new theories on underground geophysical and geochemical interactions which had been reported to occur during the preparation stages of earthquakes and the remotely measurable variations have been put to test and some warning factors were suggested as earthquake precursors. Data vendors are providing daily basis information from the earth's surface by combining remote sensing data and in situ observations. In this paper, we analyze atmospheric, oceanic, and surface changes in the ocean, coast, and land lying near the epicenters of two recent major earthquakes. The changes are studied in terms of the regional fault locations which have been reported by the U.S. Geological Survey as the shake triggering geological structures. Our detailed analyses showed anomalous increases of surface latent heat flux (SLHF) for both the earthquakes. Meaningfully limited to the geographical extents of the regional active faults, the SLHF variation patterns suggest pre-seismic activity 2–3 weeks before the main events. The agreement of these variations with abnormalities in other climatic and surface factors like relative humidity and temperature represents an unusual situation during the same period as well. Spatiotemporal variations of chlorophyll-a was also studied as another earthquake indicator. Abnormal rises in these factors are possibly caused by the formation of micro-cracks, heat production, evaporation, ionization, and upwelling of nutrient-rich water produced by pre-seismic activity prior to the main events.
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Acknowledgments
The authors are grateful to all data providers and the NASA teams. We thank the scientists of International Research Institute of Climate and Society (IRI/LDEO) and Asia Pacific Data Research Center (APDRC). We also acknowledge the MODIS mission scientists and associated NASA personnel for the production of the data used in this research effort. Upwelling indices for the Pacific Ocean have been downloaded from Pacific Fisheries Environmental Laboratory (PFEL). AMSR-E data is provided by the National Space Development Agency of Japan (NASDA).
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Alvan, H.V., Mansor, S., Omar, H. et al. Precursory signals associated with the 2010 M8.8 Bio-Bio earthquake (Chile) and the 2010 M7.2 Baja California earthquake (Mexico). Arab J Geosci 7, 4889–4897 (2014). https://doi.org/10.1007/s12517-013-1117-9
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DOI: https://doi.org/10.1007/s12517-013-1117-9