Analysis of observations backing up the existence of VLF and ionospheric TEC anomalies before the Mw6.1 earthquake in Greece, January 26, 2014

摘要: Abstract The present work integrates ground-based ionosphere measurements using very-low-frequency radio transmissions with satellite of the total electron content to draw common conclusions about possible impact that Mw6.1 earthquake took place in Greece on January 26, 2014, had ionosphere. Very-low-frequency signals reveal existence an ∼4-day anomaly wavelet spectra received inside preparation zone and a significant increase normalized variance prior (approximately 1 day before). Through analysis, it was identify clear from 15:00 until 20:00 UT day before appears again between 07:00 UT 08:00 UT. anomalous values reach TEC∗Sigma ∼4.36 3.11, respectively. Their spatial temporal distributions give grounds assume link preparation. geomagnetic, solar weather conditions during considered period are presented taken into account. This is initial original step towards multi-parameter approach problem earthquake-related effects joining observations made both ground stations satellites. A well-founded knowledge these phenomena clearly necessary dealing their application prediction purposes.