Seismotectonic Movements in the Minute Range of Periods Before the Catastrophic Earthquake in Japan March 11, 2011

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Abstract

The vertical movements measured by a broadband seismic stations located around Tohoku earthquake 11.03. 2011 with magnitude 9 are calculated. It is shown that during the 15 years before the earthquake the closest to epicenter MAJO station located 386 km from the epicenter the quiet daily variations was demonstrated. Seismic pulses with the durations of a few minutes and amplitudes bigger 10% of the diurnal variations of tidal velocities were revealed in 2009 year. They appeared under quiet meteorological and geomagnetic conditions. These pulses are not found on the records of the stations remoted more 700 km from epicenter. It is hypothesized that sharp changes in the low frequency seismic noise reflect the tectonic deformations in the lithosphere of Japan and adjoin part of Pacific Ocean.

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About the authors

G. A. Sobolev

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Author for correspondence.
Email: inmig@mail.ru
Russian Federation, Bol’shaya Gruzinskaya str., 10, bld. 1, Moscow, 123242

I. N. Migunov

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: inmig@mail.ru
Russian Federation, Bol’shaya Gruzinskaya str., 10, bld. 1, Moscow, 123242

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Supplementary files

Supplementary Files
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2. Fig. 1. Seismic and meteorological stations, the data of which were used in this work.

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3. Fig. 2. Comparison of the theoretical Earth tide (1) with its values ​​according to data from the MAJO seismic station (2).

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4. Fig. 3. The shape of seismic pulses recorded by the STS-1 seismograph (1) and the STS-2 seismograph (2) before the Tohoku earthquake.

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5. Fig. 4. Comparison of the vertical ground motion velocity V (1) and absolute values ​​SV (2) after its integration in the seismic pulse before the Tohoku earthquake.

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6. Fig. 5. The occurrence of seismic pulses before the Tohoku earthquake in the interval of January 1 – March 10 in 2009 (1), 2010 (2) and 2011 (3).

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7. Fig. 6. Comparison of the occurrence times of seismic pulses at the MAJO station (1) with variations in atmospheric pressure pp, precipitation amount dd and wind speed ww at a nearby meteorological observatory in the interval of January 1 – March 10, 2009.

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8. Fig. 7. Comparison of the times of occurrence of seismic pulses at the MAJO station (1) with variations in atmospheric pressure pp, precipitation amount dd and wind speed ww at a nearby meteorological observatory in the interval from January 1 to March 10, 2010.

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9. Fig. 8. Comparison of the times of occurrence of seismic pulses at the MAJO station (1) with variations in atmospheric pressure pp, precipitation amount dd and wind speed ww at a nearby meteorological observatory in the interval from January 1 to March 10, 2011.

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10. Fig. 9. Comparison of the times of occurrence of seismic pulses at the MAJO station (1) in the interval of January 1 – March 10, 2009 (1), 2010 (3), 2011 (5) with the level of geomagnetic activity (Kp-indices) in the same time intervals (2, 4, 6).

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11. Fig. 10. Comparison of the times of occurrence of seismic pulses at the MAJO station (1) in the interval of January 1 – March 10, 2011 with changes in the vertical displacement of the Earth’s surface (2) at the GPS point g105 (see Fig. 1).

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