Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry
Abstract T phases from 54 South American earthquakes with Mw > 5.2 are observed at a broadband station on Juan Fernandez Island. We computed the T phase energy flux (TPEF) values of the seismograms. The TPEF values show a large dispersion that can be explained by considering the tectonic characte...
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Wiley
2018-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL076790 |
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| author | Miguel Sáez Sergio Ruiz |
| author_facet | Miguel Sáez Sergio Ruiz |
| author_sort | Miguel Sáez |
| collection | DOAJ |
| description | Abstract T phases from 54 South American earthquakes with Mw > 5.2 are observed at a broadband station on Juan Fernandez Island. We computed the T phase energy flux (TPEF) values of the seismograms. The TPEF values show a large dispersion that can be explained by considering the tectonic characteristics of the South American plate and the Nazca plate bathymetry. The TPEFs generated by the 2015 Illapel and 2017 Valparaíso seismic sequences were controlled by the positions of the interface events along the dip. The central and downdip interplate earthquakes were more efficient in the generation of T phases than the near‐trench interplate earthquakes (depths of <15 km). The variations in the generation efficiency with depth are explained by the continental raypaths of the body waves and the incidence angles of waves entering the sound fixing and ranging channel. Additionally, we observed differences in the TPEFs from both earthquake sequences that were controlled by seamounts atop the Nazca plate along the T phase paths. |
| format | Article |
| id | doaj-art-31ac6d5de83f40dcbadc1c81b9e66d55 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2018-03-01 |
| publisher | Wiley |
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| series | Geophysical Research Letters |
| spelling | doaj-art-31ac6d5de83f40dcbadc1c81b9e66d552025-08-20T02:34:46ZengWileyGeophysical Research Letters0094-82761944-80072018-03-014562610261710.1002/2017GL076790Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca BathymetryMiguel Sáez0Sergio Ruiz1Geophysics department Universidad de Chile Santiago ChileGeophysics department Universidad de Chile Santiago ChileAbstract T phases from 54 South American earthquakes with Mw > 5.2 are observed at a broadband station on Juan Fernandez Island. We computed the T phase energy flux (TPEF) values of the seismograms. The TPEF values show a large dispersion that can be explained by considering the tectonic characteristics of the South American plate and the Nazca plate bathymetry. The TPEFs generated by the 2015 Illapel and 2017 Valparaíso seismic sequences were controlled by the positions of the interface events along the dip. The central and downdip interplate earthquakes were more efficient in the generation of T phases than the near‐trench interplate earthquakes (depths of <15 km). The variations in the generation efficiency with depth are explained by the continental raypaths of the body waves and the incidence angles of waves entering the sound fixing and ranging channel. Additionally, we observed differences in the TPEFs from both earthquake sequences that were controlled by seamounts atop the Nazca plate along the T phase paths.https://doi.org/10.1002/2017GL076790T phaseT phase energy fluxJuan Fernandez Islandwave propagation |
| spellingShingle | Miguel Sáez Sergio Ruiz Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry Geophysical Research Letters T phase T phase energy flux Juan Fernandez Island wave propagation |
| title | Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry |
| title_full | Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry |
| title_fullStr | Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry |
| title_full_unstemmed | Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry |
| title_short | Controls on the T Phase Energy Fluxes Recorded on Juan Fernandez Island by Continental Seismic Wave Paths and Nazca Bathymetry |
| title_sort | controls on the t phase energy fluxes recorded on juan fernandez island by continental seismic wave paths and nazca bathymetry |
| topic | T phase T phase energy flux Juan Fernandez Island wave propagation |
| url | https://doi.org/10.1002/2017GL076790 |
| work_keys_str_mv | AT miguelsaez controlsonthetphaseenergyfluxesrecordedonjuanfernandezislandbycontinentalseismicwavepathsandnazcabathymetry AT sergioruiz controlsonthetphaseenergyfluxesrecordedonjuanfernandezislandbycontinentalseismicwavepathsandnazcabathymetry |