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Tilt observations in the normal mode frequency band at the Geodynamic Observatory Cueva de los Verdes, Lanzarote

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Kalinina, A.V. and Volkov, VA and Gorbatikov, AV and Arnoso, J. and Vieira, R. and Benavent Merchán, María Teresa (2004) Tilt observations in the normal mode frequency band at the Geodynamic Observatory Cueva de los Verdes, Lanzarote. Pure and Applied Geophysics, 161 (7). pp. 1597-1611. ISSN 0033-4553

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Abstract

We have conducted observations with the aid of a seismo-tiltmeter station, which is based
on the Ostrovsky pendulum and installed at the Geodynamic Observatory Cueva de los Verdes at
Lanzarote Island since 1995. In this station the signal is separated into two frequency bands – tidal tilts
(from 0 to 5 mHz) and ground oscillations in the frequency range of free Earth’s normal modes (from 0.2
to 5 mHz). The later band, called accelerometer channel, has additional amplification. We analyzed the
background records in the frequency range of Earth’s free oscillations from August 2000 to September
2001, as well as, Earth’s normal modes after strong earthquakes. We found several distinctive persistent
peaks in the spectra of background oscillations. Both amplitudes of distinguished peaks and noises have
seasonal variations. We found that spectra of background oscillations are different in the frequency
interval between 1.4 and 2.5 mHz for North- South and East-West components.


Item Type:Article
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International Complutense Seminar on Geodetic and Geophysical Effects Associated with Seismic and Volcanic Hazards, Oct 08-11, 2001, Madrid, Spain

Uncontrolled Keywords:Earths Free Oscillations; Canary-Islands; Crustal Structure; Incessant Excitation; Gravity; background Earth's oscillations; Earth's normal modes; seismo-tiltmeter; tidal tilts; Lanzarote; Canary; Geochemistry & Geophysics
Subjects:Sciences > Physics > Geophysics
ID Code:14808
Deposited On:18 Apr 2012 08:55
Last Modified:27 Jul 2018 08:04

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