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Variation of Altitude Observed on the Occasion of the Tohoku Earthquake (M = 9.0) Occurred on March 11, 2011

Open Journal of Earthquake Research 2014年第1期3卷 22-29页

作者： Pietro Milillo tommaso maggipinto Pier Francesco Biagi Department of Physics University of Bari Bari Italy School of Engineering University of Basilicata Potenza Italy

Since October 1, 2010, a GPS receiver is put into operation at Tokai (Japan) in an experiment on Neutrino Physics (T2K). A significant variation of the altitude was detected from the beginning of March 2011, so that it has made worthwhile to investigate the possibility that such variations could be correlated to the Tohoku earthquake. In order to investigate in details this possibility, we analyzed the GPS data collected during 2011 by GEONet the GPS Earth Observation Network (GEONET). GEONET is the GPS network of Japan and consists of 1240 permanent stations. Preliminary results of the analysis seemed to show ten days before the earthquake, some possible anomalous behaviors of the stations. These anomalous behaviors were particularly relevant for stations of the network near the epicentral area. While co-seismic and post-seismic variations are widely expected, the anomalies recorded about ten days before the earthquake could be seriously considered among short-term precursors of the earthquake. In order to confirm this possibility, more detailed studies have been performed. In particular, GEONET currently makes available only daily solutions of the stations coordinates. On the contrary, it is very important to improve the time resolution just to understand the features of the anomalies till the last hours before the Earthquake. For this reason, we have performed an analysis to evaluate the coordinates and movement on hourly basis so improving the time resolution.

关键词： Earthquake GPS Time Series

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Anomalies Observed in VLF and LF Radio Signals on the Occasion of the Western Turkey Earthquake(M_(W)=5.7)on May 19,2011

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International Journal of Geosciences 2012年第4期3卷 856-865页

作者： Pier Francesco Biagi Flavia Righetti tommaso maggipinto Luigi Schiavulli Teresa Ligonzo Anita Ermini Iren Adelina Moldovan Adrian Septimiu Moldovan Hugo Goncalves Silva Mourad Bezzeghoud Michael E.Contadakis Dimitrios N.Arabelos Thomas D.Xenos Aydin Buyuksarac Department of Physics University of BariBariItaly Department of Industrial Engineering University of Tor VergataRomeItaly National Institute of Earth’s Physics Seismological DepartmentBucharestRomania AZEL-Designing Group S.R.L. BucharestRomania Geophysical Centre of Evora and Physics Department ECTUniversity of EvoraEvoraPortugal Department of Surveying&Geodesy University of ThessalonikiThessalonikiGreece Department of Geophysics Canakkale Onsekiz Mart UniversityCanakkaleTurkey

Since 2009 a network of VLF (20 - 60 kHz) and LF (150 - 300 kHz) radio receivers is operating in Europe in order to study the disturbances produced by the earthquakes on the propagation of these signals. In 2011 the network was formed by nine receivers, of which three are located in Italy and one is in Austria, Greece, Portugal, Romania, Russia and Turkey. On May 19, 2001 an earthquake (Mw = 5.7) occurred in western Turkey, that is inside the “sensitive” area of the network. The radio data collected during April-May 2011 were studied using the Wavelet spectra, the Principal Component Analysis and the Standard Deviation trends as different methods of analysis. Evident anomalies were revealed both in the signals broadcasted by the TRT transmitter (180 kHz) located near Ankara and in a VLF signal coming from a transmitter located in Western Europe and collected by the receiver TUR of the network located in eastern Turkey. Evident precursor phases were pointed out. Some differences in the efficiency of the three analysis methods were revealed.

关键词： Earthquake Precursors European Radio Network Radio Signal Analysis

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