A search for split SKS waveforms in the North Atlantic
To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide s...
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| Autor*in: |
Kuo, Ban-Yuan [verfasserIn] Forsyth, Donald W. [verfasserIn] |
|---|
| Format: |
E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Publishing Ltd ; 1992 |
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| Schlagwörter: |
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| Umfang: |
Online-Ressource |
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| Reproduktion: |
2007 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: Geophysical journal international - Oxford . Wiley-Blackwell, 1922, 108(1992), 2, Seite 0 |
| Übergeordnetes Werk: |
volume:108 ; year:1992 ; number:2 ; pages:0 |
| Links: |
|---|
| DOI / URN: |
10.1111/j.1365-246X.1992.tb04636.x |
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NLEJ239655184 |
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| 520 | |a To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. | ||
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10.1111/j.1365-246X.1992.tb04636.x doi (DE-627)NLEJ239655184 DE-627 ger DE-627 rakwb Kuo, Ban-Yuan verfasserin aut A search for split SKS waveforms in the North Atlantic Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. 2007 Blackwell Publishing Journal Backfiles 1879-2005 |2007|||||||||| North Atlantic Forsyth, Donald W. verfasserin aut In Geophysical journal international Oxford . Wiley-Blackwell, 1922 108(1992), 2, Seite 0 Online-Ressource (DE-627)NLEJ243927827 (DE-600)2006420-2 1365-246X nnns volume:108 year:1992 number:2 pages:0 http://dx.doi.org/10.1111/j.1365-246X.1992.tb04636.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 108 1992 2 0 |
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10.1111/j.1365-246X.1992.tb04636.x doi (DE-627)NLEJ239655184 DE-627 ger DE-627 rakwb Kuo, Ban-Yuan verfasserin aut A search for split SKS waveforms in the North Atlantic Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. 2007 Blackwell Publishing Journal Backfiles 1879-2005 |2007|||||||||| North Atlantic Forsyth, Donald W. verfasserin aut In Geophysical journal international Oxford . Wiley-Blackwell, 1922 108(1992), 2, Seite 0 Online-Ressource (DE-627)NLEJ243927827 (DE-600)2006420-2 1365-246X nnns volume:108 year:1992 number:2 pages:0 http://dx.doi.org/10.1111/j.1365-246X.1992.tb04636.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 108 1992 2 0 |
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10.1111/j.1365-246X.1992.tb04636.x doi (DE-627)NLEJ239655184 DE-627 ger DE-627 rakwb Kuo, Ban-Yuan verfasserin aut A search for split SKS waveforms in the North Atlantic Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. 2007 Blackwell Publishing Journal Backfiles 1879-2005 |2007|||||||||| North Atlantic Forsyth, Donald W. verfasserin aut In Geophysical journal international Oxford . Wiley-Blackwell, 1922 108(1992), 2, Seite 0 Online-Ressource (DE-627)NLEJ243927827 (DE-600)2006420-2 1365-246X nnns volume:108 year:1992 number:2 pages:0 http://dx.doi.org/10.1111/j.1365-246X.1992.tb04636.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 108 1992 2 0 |
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10.1111/j.1365-246X.1992.tb04636.x doi (DE-627)NLEJ239655184 DE-627 ger DE-627 rakwb Kuo, Ban-Yuan verfasserin aut A search for split SKS waveforms in the North Atlantic Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. 2007 Blackwell Publishing Journal Backfiles 1879-2005 |2007|||||||||| North Atlantic Forsyth, Donald W. verfasserin aut In Geophysical journal international Oxford . Wiley-Blackwell, 1922 108(1992), 2, Seite 0 Online-Ressource (DE-627)NLEJ243927827 (DE-600)2006420-2 1365-246X nnns volume:108 year:1992 number:2 pages:0 http://dx.doi.org/10.1111/j.1365-246X.1992.tb04636.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 108 1992 2 0 |
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10.1111/j.1365-246X.1992.tb04636.x doi (DE-627)NLEJ239655184 DE-627 ger DE-627 rakwb Kuo, Ban-Yuan verfasserin aut A search for split SKS waveforms in the North Atlantic Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. 2007 Blackwell Publishing Journal Backfiles 1879-2005 |2007|||||||||| North Atlantic Forsyth, Donald W. verfasserin aut In Geophysical journal international Oxford . Wiley-Blackwell, 1922 108(1992), 2, Seite 0 Online-Ressource (DE-627)NLEJ243927827 (DE-600)2006420-2 1365-246X nnns volume:108 year:1992 number:2 pages:0 http://dx.doi.org/10.1111/j.1365-246X.1992.tb04636.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 108 1992 2 0 |
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10.1111/j.1365-246X.1992.tb04636.x |
| author2-role |
verfasserin |
| title_sort |
a search for split sks waveforms in the north atlantic |
| title_auth |
A search for split SKS waveforms in the North Atlantic |
| abstract |
To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. |
| abstractGer |
To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. |
| abstract_unstemmed |
To test a prediction of the anisotropic properties of the upper mantle beneath the central North Atlantic, we measure splitting of the waveforms of SKS phases recorded at WWSSN stations in the Azores (PDA), and on Bermuda (BEC). Because the analysis of individual, analogue records does not provide sufficient resolution, we have developed a new technique for representing the confidence limits that permits a straightforward estimation of the average splitting beneath a station from a group of events. If events from a variety of different azimuths are recorded, the average splitting parameters can be tightly constrained. We found five records for PDA and eight for BEC that have good signal-to-noise ratio and a prominent SKS phase. Only one of the phases at PDA shows evidence of splitting; the average anisotropy must be small if it exists at all. At BEC, the average anisotropy is significant with a fast direction between NW-SE and N-S and a time delay between the two split components of about 1 s. Both of these observations are significantly smaller than predicted by a model of the upper mantle anisotropy based on SS-S differential traveltimes. The absence of systematic anisotropy at PDA may be attributable to a complex flow pattern in the upper mantle at this site near the Eurasian-African plate boundary in the vicinity of an active hotspot. At BEC, the observed direction is consistent with the prediction and both the direction and the magnitude of the average anisotropy are indicative of a sublithospheric source.To check the reliability of these results from analogue records, we have performed a similar analysis for station KIP on Oahu where digital records are available for comparison. The results from digital and analogue records are similar. At KIP, the splitting is more variable than expected for uniform anisotropy, with the fast directions for individual records ranging from about N26°E to about N83°E and with variable time delays. Similar variability is observed at all three stations. The average anisotropy at KIP is well-constrained, however, with a time delay of about 0.6 s and fast direction N75°E. The fast direction coincides with the fossil sea-floor spreading direction beneath the Hawaiian islands, suggesting that the dominant source of anisotropy beneath KIP is lithospheric. |
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| title_short |
A search for split SKS waveforms in the North Atlantic |
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Forsyth, Donald W. |
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