Moderate Earthquake Teleseismic Depth Estimations: New Methods and Use of the Comprehensive Nuclear-Test-Ban Treaty Organization Network Data

Letort, Jean; Vergoz, Julien; Guilbert, J.; Cotton, Fabrice; Sèbe, Olivier; Cano, Yoann

doi:10.1785/0120130126

Cited by 12 publications

(16 citation statements)

References 24 publications

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“…From this assumption, and working in the spectral domain, the cepstral method automatically and efficiently detects the delay T 1 − T 0 between the two phases, through the study of the spectral modulation of the source from the echo, as shown, for instance, by Cohen (1970), Childers et al (1977), Bonner et al (2002) and Letort et al (2014). Indeed, with ω as the pulsation, (ω = 2 π f, in the Fourier domain, this becomes as in eq.…”

Section: Limitations Of Classical Cepstral Analysismentioning

confidence: 99%

“…(b) Classical cepstrum analysis using eq. (5) and removing the main trend of the signal, following Letort et al (2014). The main peak comes from the pP-sP delay and does not allow information on the depth to be deduced.…”

Section: Limitations Of Classical Cepstral Analysismentioning

confidence: 99%

“…(5). For instance, Letort et al (2014) removed the main trend of the spectrum as the P-wave contribution to the spectrum. However, in the case of a complex P wave, this trend might be an incorrect representation of the source spectrum, as smoother than predicted.…”

Section: Limitations Of Classical Cepstral Analysismentioning

confidence: 99%

“…We then apply the subtraction method for all of these estimated cepstra (as described above) to get a new set of improved cepstra. We finally apply the F-statistic procedure to this new set of cepstra, (following Letort et al 2014), to give a final single depth probability curve (the F-statistic curve) associated to the array. This F-statistic curve for each station/array represents the probability of detection of the depth phases.…”

Section: Automatic Analysis From the Cepstral Peaks To Focal Depth Esmentioning

confidence: 99%

“…The method is a modification of the cepstral analysis method from Letort et al (2014), and it aims to detect these surface-reflected waves in a signal at teleseismic distances (pP and sP waves). The key point for the success of this method is our computation of the automatic detection of the depth phases in a signal, and their identification without any a priori and analyst-subjective judgment.…”

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confidence: 99%

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A new, improved and fully automatic method for teleseismic depth estimation of moderate earthquakes (4.5 < M < 5.5): application to the Guerrero subduction zone (Mexico)

Letort

Guilbert

Cotton

et al. 2015

Geophysical Journal International

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: A new, improved and fully automatic method for teleseismic depth estimation of moderate earthquakes (4.5 < M < 5.5): application to the Guerrero subduction zone (Mexico). -Geophysical Journal International, 201, p. 1834-1848 • ) through the study of the spectral holes in the shape of the signal spectrum. The ability of our automatic method to improve depth estimations is shown by relocation of the recent moderate seismicity of the Guerrero subduction area (Mexico). We have therefore estimated the depth of 152 events using teleseismic data from the IRIS stations and arrays. One advantage of this method is that it can be applied for single stations (from IRIS) as well as for classical arrays. In the Guerrero area, our new cepstral analysis efficiently clusters event locations and provides an improved view of the geometry of the subduction. Moreover, we have also validated our method through relocation of the same events using the new International Seismological Centre (ISC)-locator algorithm, as well as comparing our cepstral depths with the available Harvard-Centroid Moment Tensor (CMT) solutions and the three available ground thrust (GT5) events (where lateral localization is assumed to be well constrained with uncertainty <5 km) for this area. These comparisons indicate an overestimation of focal depths in the ISC catalogue for deeper parts of the subduction, and they show a systematic bias between the estimated cepstral depths and the ISC-locator depths. Using information from the CMT catalogue relating to the predominant focal mechanism for this area, this bias can be explained as a misidentification of sP phases by pP phases, which shows the greater interest for the use of this new automatic cepstral analysis, as it is less sensitive to phase identification.

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Section: Limitations Of Classical Cepstral Analysismentioning

confidence: 99%

Section: Limitations Of Classical Cepstral Analysismentioning

confidence: 99%

Section: Limitations Of Classical Cepstral Analysismentioning

confidence: 99%

Section: Automatic Analysis From the Cepstral Peaks To Focal Depth Esmentioning

confidence: 99%

mentioning

confidence: 99%

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A new, improved and fully automatic method for teleseismic depth estimation of moderate earthquakes (4.5 < M < 5.5): application to the Guerrero subduction zone (Mexico)

Letort

Guilbert

Cotton

et al. 2015

Geophysical Journal International

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Seismic Source Characterization

Pecker¹,

Faccioli

Gürpinar³

et al. 2017

An Overview of the SIGMA Research Project

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A database of damaging small-to-medium magnitude earthquakes

et al. 2020

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Interest in small-to-medium magnitude earthquakes and their potential consequences has increased significantly in recent years, mostly due to the occurrence of some unusually damaging small events, the development of seismic risk assessment methodologies for existing building stock, and the recognition of the potential risk of induced seismicity. As part of a clear ongoing effort of the earthquake engineering community to develop knowledge on the risk posed by smaller events, a global database of earthquakes with moment magnitudes in the range from 4.0 to 5.5 for which damage and/or casualties have been reported has been compiled and is made publicly available. The two main purposes were to facilitate studies on the potential for earthquakes in this magnitude range to cause material damage and to carry out a statistical study to characterise the frequency with which earthquakes of this size cause damage and/or casualties (published separately). The present paper describes the data sources and process followed for the compilation of the database, while providing critical discussions on the challenges encountered and decisions made, which are of relevance for its interpretation and use. The geographic, temporal, and magnitude distributions of the 1958 earthquakes that make up the database are presented alongside the general statistics on damage and casualties, noting that these stem from a variety of sources of differing reliability. Despite its inherent limitations, we believe it is an important contribution to the understanding of the extent of the consequences that may arise from earthquakes in the magnitude range of study.

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Moderate Earthquake Teleseismic Depth Estimations: New Methods and Use of the Comprehensive Nuclear-Test-Ban Treaty Organization Network Data

Cited by 12 publications

References 24 publications

A new, improved and fully automatic method for teleseismic depth estimation of moderate earthquakes (4.5 < M < 5.5): application to the Guerrero subduction zone (Mexico)

A new, improved and fully automatic method for teleseismic depth estimation of moderate earthquakes (4.5 < M < 5.5): application to the Guerrero subduction zone (Mexico)

Seismic Source Characterization

A database of damaging small-to-medium magnitude earthquakes

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