Tilt Observations in the Normal Mode Frequency Band at the Geodynamic Observatory Cueva de los Verdes, Lanzarote

Kalinina, A. V.; Volkov, V. A.; Горбатиков, А. В.; Arnoso, José; Vieira, Ricardo; Benavent, M.

doi:10.1007/s00024-004-2523-4

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Single frequency lines do not appear at fixed frequencies, i.e., the frequency content changes with time. Earth's “hum” or modes, which show fixed lines in this frequency range, can therefore most likely be excluded [ Braitenberg , 2006; Kalinia et al , 2004; Webb , 2007]. Moreover, “hum,” which was observed at quiet sites in observatories on land, is orders of magnitude smaller than the signals measured by the OBT at the Mid‐Atlantic Ridge.…”

Section: Discussionmentioning

confidence: 99%

Long‐term tilt and acceleration data from the Logatchev Hydrothermal Vent Field, Mid‐Atlantic Ridge, measured by the Bremen Ocean Bottom Tiltmeter

Fabian

Villinger

2008

Geochem Geophys Geosyst

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[1] Long-term seafloor deformations in the Logatchev Hydrothermal Vent Field (LHF) at the Mid-Atlantic Ridge are largely unexplored and unknown, even though the LHF has been the focus of international research for many years. As seafloor tilt and vertical acceleration provide key information about seafloor deformations, the Bremen Ocean Bottom Tiltmeter (OBT) was deployed in May 2005 at position 14°45 0 11.7 00 N, 44°58 0 47.0 00 W, 3035 m water depth in the LHF. The OBT recorded 384 days and was recovered in January 2007. Strong tilt steps and strong gradual tilt changes over less than a minute to days in the range of some 10 mrad and aligned mostly with the topography possibly indicate nearby mass movements like avalanches of bulk material due to local uplift or subsidence or may show tectonic activity. A vertically aligned high-resolution microelectromechanical systems (MEMS) accelerometer of type Servo K-Beam in the sensor package seems to be helpful to distinguish between tilt signals caused by a true rotation and fake tilt related to a transient translational motion of the OBT in a horizontal direction. Hodographs show elliptic motion patterns with about 1 mrad total tilt amplitude and distinct orientations of tilt toward hydrothermal vents. It is up to speculation whether the latter signals are related to hydrothermal fluid circulation. The amplitude spectra of these tilt signals and acceleration show discrete lines mostly between 0.1 and 50 mHz. The spectra show the periodic character of those signals and also proof that tides or bottom currents, which are known to show lower signal frequencies, or tremor, which generally has higher frequencies, are most likely not the reason. Compared with studies onshore and offshore, the LHF is most likely an area of strong and highly variable seafloor deformations.

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Section: Discussionmentioning

confidence: 99%

Long‐term tilt and acceleration data from the Logatchev Hydrothermal Vent Field, Mid‐Atlantic Ridge, measured by the Bremen Ocean Bottom Tiltmeter

Fabian

Villinger

2008

Geochem Geophys Geosyst

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Atmosphere, ocean and lithosphere interaction as a possible drive of earthquake triggering

Volkov

Mrlina

Dubrov

et al. 2020

Geodesy and Geodynamics

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25 years recording of the long-base fluid tiltmeter installed at 2.850 m a.s.l. observatory of Pizzi Deneri on Etna volcano

Bonaccorso,

Falzone,

Ferro

et al. 2024

Earth Planets Space

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Etna is a highly active volcano with frequent eruptions and is closely observed with different monitoring techniques. One of the monitoring methods is a network of short-base tiltmeters that provides continuous control of ground deformation. Since 1996, this network has been integrated with a long-base fluid tiltmeter installed in two 80 m long connected tunnels at the high-altitude (2850 m a.s.l.) volcanological observatory of Pizzi Deneri (PDN) located on the volcano’s summit. The instrumentation was devised with an innovative configuration composed of mercury, free to move along the entire length of the tiltmeter in response to the ground tilt, and laser sensors to measure the changes in the mercury levels. In this study, for the first time, we present the entire 25-year series of data recorded by this instrumentation. During this long interval, the Etna volcano was characterized by numerous major eruptions due to dyke intrusions. The tilt variations recorded in the short-term during the rapid intrusive phases are presented and discussed. These signals contributed both to the modeling of eruptive processes, and in particular in the case of the 2002–2003 eruption, to the real-time understanding of the ongoing eruptive phenomenon, supporting the correct hazard assessment. In the medium-long term (years to decades), we show and discuss that the PDN signal is mainly related to the marked sliding of the entire eastern sector of the volcano. Graphical Abstract

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Tilt Observations in the Normal Mode Frequency Band at the Geodynamic Observatory Cueva de los Verdes, Lanzarote

Cited by 3 publications

References 15 publications

Long‐term tilt and acceleration data from the Logatchev Hydrothermal Vent Field, Mid‐Atlantic Ridge, measured by the Bremen Ocean Bottom Tiltmeter

Long‐term tilt and acceleration data from the Logatchev Hydrothermal Vent Field, Mid‐Atlantic Ridge, measured by the Bremen Ocean Bottom Tiltmeter

Atmosphere, ocean and lithosphere interaction as a possible drive of earthquake triggering

25 years recording of the long-base fluid tiltmeter installed at 2.850 m a.s.l. observatory of Pizzi Deneri on Etna volcano

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