دورية أكاديمية
Slowness vector estimation over large-aperture sparse arrays with the Continuous Wavelet Transform (CWT): application to Ocean Bottom Seismometers
| العنوان: | Slowness vector estimation over large-aperture sparse arrays with the Continuous Wavelet Transform (CWT): application to Ocean Bottom Seismometers |
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| المؤلفون: | Cabieces, Roberto, Krüger, Frank, García-Yeguas, Araceli, Villaseñor, Antonio, Buforn, Elisa, Pazos, Antonio, Olivar-Castaño, Andrés, Barco, Jaime |
| المساهمون: | Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España) |
| بيانات النشر: | Royal Astronomical Society |
| سنة النشر: | 2020 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| مصطلحات موضوعية: | Wavelet transform, Computational seismology, Earthquake monitoring and test-ban treaty verification, Earthquake source observations, Seismicity and tectonics, Wave propagation |
| الوصف: | 16 pages, 13 figures, 2 tables, supplementary material https://doi.org/10.1093/gji/ggaa427Test.-- This is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International 223(3): 1919-1934 (2020)following peer review. The version of record [insert complete citation information here] is available online at https://doi.org/10.1093/gji/ggaa427Test ; This work presents a new methodology designed to estimate the slowness vector in large-aperture sparse Ocean Bottom Seismometer (OBS) arrays. The Continuous Wavelet Transform (CWT) is used to convert the original incoherent traces that span a large array, into coherent impulse functions adapted to the array aperture. Subsequently, these impulse functions are beamformed in the frequency domain to estimate the slowness vector. We compare the performance of this new method with that of an alternative solution, based on the Short-/Long-Term Average algorithm and with a method based on the trace envelope, with the ability to derive a very fast detection and slowness vector estimation of seismic signal arrivals. The new array methodology has been applied to data from an OBS deployment with an aperture of 80 km and an interstation distance of about 40 km, in the vicinity of Cape Saint Vincent (SW Iberia). A set of 17 regional earthquakes with magnitudes 2 < mbLg < 5, has been selected to test the capabilities of detecting and locating regional seismic events with the Cape Saint Vincent OBS Array. We have found that there is a good agreement between the epicentral locations obtained previously by direct search methods and those calculated using the slowness vector estimations resulting from application of the CWT technique. We show that the proposed CWT method can detect seismic signals and estimate the slowness vector from regional earthquakes with high accuracy and robustness under low signal-to-noise ratio conditions. Differences in epicentral distances applying direct search methods and the CWT technique are between 1 and 21 km ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| تدمد: | 0956-540X |
| العلاقة: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2013-45724-C3-3-R; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CGL2017-86097-R; Preprint; https://doi.org/10.1093/gji/ggaa427Test; Sí; e-issn: 1365-246X; Geophysical Journal International 223(3): 1919-1934 (2020); CEX2019-000928-S; http://hdl.handle.net/10261/234447Test; http://dx.doi.org/10.13039/501100003329Test; http://dx.doi.org/10.13039/501100011033Test |
| DOI: | 10.1093/gji/ggaa427 |
| DOI: | 10.13039/501100003329 |
| DOI: | 10.13039/501100011033 |
| الإتاحة: | https://doi.org/10.1093/gji/ggaa427Test https://doi.org/10.13039/501100003329Test https://doi.org/10.13039/501100011033Test http://hdl.handle.net/10261/234447Test |
| حقوق: | open |
| رقم الانضمام: | edsbas.AB730829 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 0956540X |
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| DOI: | 10.1093/gji/ggaa427 |