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The Slichter Mode Detection and Estimation from Laser Interferometer–Strainmeter Observations of the Chilean Earthquake of February 27, 2010
- Source :
- Izvestiya, Physics of the Solid Earth. 56:737-748
- Publication Year :
- 2020
- Publisher :
- Pleiades Publishing Ltd, 2020.
-
Abstract
- —The Slichter mode (1S1) is the longest-period mode of the free oscillations of the Earth. The period of the Slichter mode directly depends on density jump between the outer liquid and the inner solid core which makes the detection of this oscillation very important for gaining a more detailed insight into the structure of the Earth’s interior. Reliable empirical data on the detection of Slichter mode are absent, which is associated with the rather low amplitude of this mode on the surface. In this work, for the first time, an attempt is made to detect the Slichter mode using the strain data from the largest 2010 Chilean earthquake recorded by the Baksan laser interferometer–strainmeter (Sternberg Astronomical Institute of the Moscow State University (SAI MSU)) with a measuring arm length of 75 m in the Elbrus region, North Caucasus. An asymptotically optimal data analysis algorithm that allows for the properties of seismic noise and peculiarities of the mode is developed. Simultaneously with mode detection, the algorithm provides evaluation of mode parameters (frequency and splitting magnitude). Statistical reliability of the detection is estimated; the parameters of the Slichter mode and the corresponding density jump between the inner and outer core of the Earth are determined.
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
Mode (statistics)
Magnitude (mathematics)
Seismic noise
Strainmeter
010502 geochemistry & geophysics
Geodesy
01 natural sciences
Outer core
Interferometry
Amplitude
General Earth and Planetary Sciences
Structure of the Earth
0105 earth and related environmental sciences
General Environmental Science
Subjects
Details
- ISSN :
- 15556506 and 10693513
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- Izvestiya, Physics of the Solid Earth
- Accession number :
- edsair.doi...........3115747c3d1c1365c3d567b31f88c110