On the correlation of seismic microtremors

Chávez-García, Francisco J.; Luzón, Francisco

doi:10.1029/2005jb003671

Cited by 76 publications

(51 citation statements)

References 31 publications

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“…Several studies have reported that SPAC, as a frequency-domain cross-correlation method, has a close relationship with the time-domain cross-correlation method Chávez-García and Luzón, 2005;Sánchez-Sesma and Campillo, 2006). These SPAC studies have validated the hypothesis that the average cross correlation of motion between two points over a long time window can substitute for the azimuthal average for all wave directions.…”

Section: Correlation Analysis Of Microtremorsmentioning

confidence: 85%

Stability and correlation properties of microtremor response

Kang

Shin

2011

Geosci J

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This study analyzed microtremor records from four stations located at the center and vertices of an equilateral triangle with 52-m sides. The stability of the horizontal-to-vertical spectral ratio (HVSR) was estimated for 12 days of continuous records. The results showed no variation in the frequency and amplitude of the peak spectral ratio over time. Although the amplitude patterns varied slightly at each station, the peak frequencies were consistent within the small four-station array. The results suggest that slight variations in subsurface structure beneath the array may have influenced the HVSR amplitudes. The HVSR estimate had little or no dependency of meteorological variations in atmospheric pressure, temperature, wind speed, rainfall, and humidity measured at a meteorological observatory approximately 1.3 km from the array. Spatial autocorrelation (SPAC) analyses indicated that time averaging of continuous micrometer records from a single pair of stations could serve as an alternative to spatial averaging for the entire array. This result implies that, with the SPAC approach, microtremor records from a single pair of stations rather than a larger array can be applied.

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Section: Correlation Analysis Of Microtremorsmentioning

confidence: 85%

Stability and correlation properties of microtremor response

Kang

Shin

2011

Geosci J

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“…We find that when sources are located only at the surface of the earth, estimates are dominated by surface waves. This dominance of surface waves is observed in passive seismology ͑Shapiro and Campillo, 2004;Shapiro et al, 2005;Gerstoft et al, 2006͒, in near-surface ͑engineering͒ seismology ͑Chávez- García and Luzón, 2005;, and in exploration seismology ͑Dong et al, Halliday et al, 2007;. Note that Halliday et al ͑2008͒ also show that the dispersive properties of multimode surface waves can be estimated using active source interferometry.…”

Section: Introductionmentioning

confidence: 87%

Interferometric ground-roll removal: Attenuation of scattered surface waves in single-sensor data

et al. 2010

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Land seismic data are contaminated by surface waves ͑or ground roll͒. These surface waves are a form of source-generated noise and can be strongly scattered by near-surface heterogeneities. The resulting scattered ground roll can be particularly difficult to separate from the desired reflection data, especially when this scattered ground roll propagates in the crossline direction. We have used seismic interferometry to estimate scattered surface waves, recorded during an exploration seismic survey, between pairs of receiver locations. Where sources and receivers coincide, these interreceiver surface-wave estimates were adaptively subtracted from the data. This predictive-subtraction process can successfully attenuate scattered surface waves while preserving the valuable reflected arrivals, forming a new method of scattered ground-roll attenuation. We refer to this as interferometric ground-roll removal.

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“…The reason is twofold. First, CHA´VEZ-GARCI´A and LUZO´N (2005) showed that the information that can be retrieved from the cross-correlation of noise records is the same in time domain and in frequency domain. Second, our use of a single station pair to compute correlation coefficients does not change the foundations of the SPAC method.…”

Section: Methodsmentioning

confidence: 99%

Shear-wave Velocity Structure around Teide Volcano: Results Using Microtremors with the SPAC Method and Implications for Interpretation of Geodetic Results

Chávez-García

Luzón

Raptakis

et al. 2007

Pure appl. geophys.

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Deformation analysis and simulation of volcanic edifices require the construction of models of elastic properties of those structures. In this paper we present an analysis of microtremor measurements recorded during the performance tests of two temporary seismic arrays installed in the eastern portion of the Teide caldera in 1994. We take advantage of recent developments of the SPAC method and use spatial cross-correlation computations to estimate phase velocity dispersion of Rayleigh waves at the location of the arrays. We show that the extension of the standard SPAC method is valid in the case of our data, justifying its use and supporting the generalization of the SPAC method to single station pairs. The phase velocity dispersion curve obtained was inverted to recover the shear-wave profile at the site of the arrays. Our results indicate that the subsoil structure of the caldera is laterally homogeneous at the scale of a few km about the location of the arrays. We obtained about 315 m of volcanic sediments overlying rocks with a shear-wave velocity of 2 km/s. These results are robust and are a starting point to further modelling of deformation, permanent or transient, at this volcanic edifice, which can be useful in the interpretation of different observed fields. In fact, the computation of deformations and gravity changes due to possible volcanic intrusions in two models; one considering the volcanic sediments and the other without considering them, provided different results in the near field.

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On the correlation of seismic microtremors

Cited by 76 publications

References 31 publications

Stability and correlation properties of microtremor response

Stability and correlation properties of microtremor response

Interferometric ground-roll removal: Attenuation of scattered surface waves in single-sensor data

Shear-wave Velocity Structure around Teide Volcano: Results Using Microtremors with the SPAC Method and Implications for Interpretation of Geodetic Results

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