Tidal modulation of seismic noise and volcanic tremor

Custódio, Susana; Fonseca, J. F.; d’Oreye, Nicolas; Faria, Bruno; Bandomo, Zuleyka

doi:10.1029/2003gl016991

Cited by 24 publications

(14 citation statements)

References 8 publications

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“…The stations record continuous seismic noise largely attributable to anthropogenic sources, although meteorological (Neuberg 2000) and/or tidal effects (Custodio et al 2003) also may play a role. After applying a seasonal decomposition of time series by loess (Cleveland et al 1990) aimed at removing most of the daily seismic 24-h cycles, a significant noise component still remains that can be ascribed to natural sources.…”

Section: Introductionmentioning

confidence: 99%

Possible interaction between tectonic events and seismic noise at Las Cañadas Volcanic Caldera, Tenerife, Spain

et al. 2008

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Continuous seismic noise is recorded in the volcanic island of Tenerife (Canary Islands, Spain). The origin of this noise, strongly augmented by anthropogenic contamination, is still under debate. In this paper, we discuss the relationship between this noise and the occurrence of local tectonic events in the same area. In particular, transitions are sought in the time evolution of dynamic parameters computed on the seismic noise, and examples are shown where abrupt transitions may be associated with the occurrence of tectonic events. These transitions provide further evidence of the existence of a natural origin for at least part of the seismic noise, which is strongly contaminated-if not dominated-by anthropogenic sources.

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Section: Introductionmentioning

confidence: 99%

Possible interaction between tectonic events and seismic noise at Las Cañadas Volcanic Caldera, Tenerife, Spain

et al. 2008

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“…The relation between elastic moduli and wave speed allows the probing of rock properties by monitoring seismic velocity changes [e.g., Lockner et al , ]. Measuring in situ responses to Earth tides is an appealing strategy because of the evident tidal effect on crustal deformation [ Tsuruoka et al , ; Custodio et al , ; Stroup et al , ; Nakata et al , ; Rubinstein et al , ] associated with the relatively well understood stress history. Routine velocity monitoring is, however, complicated by the dependence on a repetitive, controlled source such as industrial machinery [ Reasenberg and Aki , ], vibrators, air guns, and piezoelectric transducers [ Yamamura et al , , and references therein].…”

Section: Introductionmentioning

confidence: 99%

In situ observations of velocity changes in response to tidal deformation from analysis of the high‐frequency ambient wavefield

et al. 2015

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We report systematic seismic velocity variations in response to tidal deformation. Measurements are made on correlation functions of the ambient seismic wavefield at 2–8 Hz recorded by a dense array at the site of the Piñon Flat Observatory, Southern California. The key observation is the dependence of the response on the component of wave motion and coda lapse time τ. Measurements on the vertical correlation component indicate reduced wave speeds during periods of volumetric compression, whereas data from horizontal components show the opposite behavior, compatible with previous observations. These effects are amplified by the directional sensitivities of the different surface wave types constituting the early coda of vertical and horizontal correlation components to the anisotropic behavior of the compliant layer. The decrease of the velocity (volumetric) strain sensitivity Sθ with τ indicates that this response is constrained to shallow depths. The observed velocity dependence on strain implies nonlinear behavior, but conclusions regarding elasticity are more ambiguous. The anisotropic response is possibly associated with inelastic dilatancy of the unconsolidated, low‐velocity material above the granitic basement. However, equal polarity of vertical component velocity changes and deformation in the vertical direction indicate that a nonlinear Poisson effect is similarly compatible with the observed response pattern. Peak relative velocity changes at small τ are 0.03%, which translates into an absolute velocity strain sensitivity of Sθ≈5 × 103 and a stress sensitivity of 0.5 MPa−1. The potentially evolving velocity strain sensitivity of crustal and fault zone materials can be studied with the method introduced here.

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“…No such annual cycle, however, was found for microearthquakes that occurred in other regions without hydrothermal or volcanic origin, suggesting that presence of a fluid phase in the crust could make a difference in earthquake triggering. Another study by Custodio et al (2003) discovered strong M 2 Earth tide modulation of volcanic tremors at Fogo Volcano, Cape Verde, again suggesting the exceptional sensitivity of trig-gering in the presence of geophysical fluids. Neuberg (2000) also reported numerous cases of strong correlation between seismo-volcanic activities and periodic loading forces such as the diurnal and semidiurnal tides and barometric pressure change in Italy, New Zealand, and Indonesia.…”

Section: Discussionmentioning

confidence: 91%

Pole-Tide Modulation of Slow Slip Events at Circum-Pacific Subduction Zones

Shen

Wang

Bürgmann

et al. 2005

Bulletin of the Seismological Society of America

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Episodic slow slip (ESS) events have been detected at several circum-Pacific subduction zones, such as Cascadia, Japan, and Mexico. Notably, at least eight ESS events along the northern Cascadia subduction zone recurred with a period of 13-16 months. We study the relationship between pole-tide (associated with Chandler wobble with a period of ϳ14 months)-induced stress and the occurrence of the ESS events. Our quantitative analysis shows that 14 of the 20 documented ESS events occurred during the ascension phase, prior to the maximum, of a pole-tide-induced Coulomb failure stress change, and three events occurred at the stress-change peak. The pole tides modulate the stress field at the downdip edge of the transition zone along the plate interface and may trigger ESS events when conditions are favorable. The phase advance of the triggered events with respect to the induced Coulomb failure stress change may reflect that the fault slip is dictated by a rate-and statedependent friction law inferred from laboratory experiments.

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Tidal modulation of seismic noise and volcanic tremor

Cited by 24 publications

References 8 publications

Possible interaction between tectonic events and seismic noise at Las Cañadas Volcanic Caldera, Tenerife, Spain

Possible interaction between tectonic events and seismic noise at Las Cañadas Volcanic Caldera, Tenerife, Spain

In situ observations of velocity changes in response to tidal deformation from analysis of the high‐frequency ambient wavefield

Pole-Tide Modulation of Slow Slip Events at Circum-Pacific Subduction Zones

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