Redshift of earthquakes via focused blind deconvolution of teleseisms
© 2020 The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. We present a robust factorization of the teleseismic waveforms resulting from an earthquake source into signals that originate from the source and signals that characterize the path effects....
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Oxford University Press (OUP)
2021
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| Online Access: | https://hdl.handle.net/1721.1/136116 |
| _version_ | 1826193670540361728 |
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| author | Bharadwaj, Pawan Meng, Chunfang Fournier, Aimé Demanet, Laurent Fehler, Mike |
| author2 | Massachusetts Institute of Technology. Department of Mathematics |
| author_facet | Massachusetts Institute of Technology. Department of Mathematics Bharadwaj, Pawan Meng, Chunfang Fournier, Aimé Demanet, Laurent Fehler, Mike |
| author_sort | Bharadwaj, Pawan |
| collection | MIT |
| description | © 2020 The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. We present a robust factorization of the teleseismic waveforms resulting from an earthquake source into signals that originate from the source and signals that characterize the path effects. The extracted source signals represent the earthquake spectrum, and its variation with azimuth. Unlike most prior work on source extraction, our method is data-driven, and it does not depend on any path-related assumptions, for example, the empirical Green's function. Instead, our formulation involves focused blind deconvolution (FBD), which associates the source characteristics with the similarity among a multitude of recorded signals. We also introduce a new spectral attribute, to be called redshift, which is based on the Fraunhofer approximation. Redshift describes source-spectrum variation, where a decrease in high-frequency content occurs at the receiver in the direction opposite to unilateral rupture propagation. Using the redshift, we identified unilateral ruptures during two recent strike-slip earthquakes. The FBD analysis of an earthquake, which originated in the eastern California shear zone, is consistent with observations from local seismological or geodetic instrumentation. |
| first_indexed | 2024-09-23T09:42:50Z |
| format | Article |
| id | mit-1721.1/136116 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:42:50Z |
| publishDate | 2021 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1361162023-03-01T21:25:20Z Redshift of earthquakes via focused blind deconvolution of teleseisms Bharadwaj, Pawan Meng, Chunfang Fournier, Aimé Demanet, Laurent Fehler, Mike Massachusetts Institute of Technology. Department of Mathematics Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences © 2020 The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. We present a robust factorization of the teleseismic waveforms resulting from an earthquake source into signals that originate from the source and signals that characterize the path effects. The extracted source signals represent the earthquake spectrum, and its variation with azimuth. Unlike most prior work on source extraction, our method is data-driven, and it does not depend on any path-related assumptions, for example, the empirical Green's function. Instead, our formulation involves focused blind deconvolution (FBD), which associates the source characteristics with the similarity among a multitude of recorded signals. We also introduce a new spectral attribute, to be called redshift, which is based on the Fraunhofer approximation. Redshift describes source-spectrum variation, where a decrease in high-frequency content occurs at the receiver in the direction opposite to unilateral rupture propagation. Using the redshift, we identified unilateral ruptures during two recent strike-slip earthquakes. The FBD analysis of an earthquake, which originated in the eastern California shear zone, is consistent with observations from local seismological or geodetic instrumentation. 2021-10-27T20:30:52Z 2021-10-27T20:30:52Z 2020 2021-05-18T18:26:10Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136116 en 10.1093/GJI/GGAA419 Geophysical Journal International Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) Other repository |
| spellingShingle | Bharadwaj, Pawan Meng, Chunfang Fournier, Aimé Demanet, Laurent Fehler, Mike Redshift of earthquakes via focused blind deconvolution of teleseisms |
| title | Redshift of earthquakes via focused blind deconvolution of teleseisms |
| title_full | Redshift of earthquakes via focused blind deconvolution of teleseisms |
| title_fullStr | Redshift of earthquakes via focused blind deconvolution of teleseisms |
| title_full_unstemmed | Redshift of earthquakes via focused blind deconvolution of teleseisms |
| title_short | Redshift of earthquakes via focused blind deconvolution of teleseisms |
| title_sort | redshift of earthquakes via focused blind deconvolution of teleseisms |
| url | https://hdl.handle.net/1721.1/136116 |
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