Seismic Pulses before the February 27, 2010, M = 8.8 Chile Earthquake

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Abstract

The study analyzes the records of vertical velocity of the Earth’s surface motions near broadband seismic stations located on the west coast of South America and in the adjacent region of the Pacific Ocean where the Mw 8.8 earthquake occurred on February 27, 2010. Starting from 2009, asymmetric seismic pulses lasting several hundred seconds have been detected in the records of some stations. These pulses appeared under quiet weather conditions and geomagnetic activity. It is believed that the earthquake was preceded by tectonic movements in the oceanic and continental lithosphere.

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About the authors

G.  A. Sobolev

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

Email: sobolev@ifz.ru
Russian Federation, Moscow

I.  N. Migunov

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

Author for correspondence.
Email: sobolev@ifz.ru
Russian Federation, Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Broadband seismic stations whose data were used in the present work. The red color shows the stations on whose records the seismic impulses analyzed in this work were detected.

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3. Fig. 2. Example of recording of earthquake (right) and asymmetric pulse (left), which occurred near the origin of Chile earthquake, at LCO station.

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4. Fig. 3. Examples of seismic pulses recorded by the LCO station on some days before the Chile earthquake. The dates of the recordings are shown near the curves on the right. On the abscissa axis is the time in seconds from the beginning of the corresponding frame; the frame was chosen so that the pulse was in its middle. On the ordinate axis is the magnitude of the seismic record in conventional units. The values of atmospheric pressure (in hPa) and wind speed (in m/s) are shown to the left of the pulses, and the level of geomagnetic activity Kp is shown to the right.

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5. Fig. 4. Examples of seismic pulses recorded by RPN station in some days before the Chile earthquake. The designations - see Fig. 3.

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