Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods

Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Michael Asten [verfasserIn] Aysegul Askan [verfasserIn] Shaghayegh Karimzadeh [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC

Übergeordnetes Werk:	In: Earth, Planets and Space - SpringerOpen, 2015, 75(2023), 1, Seite 12
Übergeordnetes Werk:	volume:75 ; year:2023 ; number:1 ; pages:12

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1186/s40623-023-01801-y

Katalog-ID:	DOAJ087765411

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allfields	10.1186/s40623-023-01801-y doi (DE-627)DOAJ087765411 (DE-599)DOAJ1be1af5c303a472891bb7d65bbb37c90 DE-627 ger DE-627 rakwb eng QB275-343 QE1-996.5 Michael Asten verfasserin aut Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC Geography. Anthropology. Recreation G Geodesy Geology Aysegul Askan verfasserin aut Shaghayegh Karimzadeh verfasserin aut In Earth, Planets and Space SpringerOpen, 2015 75(2023), 1, Seite 12 (DE-627)353898597 (DE-600)2087663-4 18805981 nnns volume:75 year:2023 number:1 pages:12 https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/article/1be1af5c303a472891bb7d65bbb37c90 kostenfrei https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/toc/1880-5981 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 75 2023 1 12
spelling	10.1186/s40623-023-01801-y doi (DE-627)DOAJ087765411 (DE-599)DOAJ1be1af5c303a472891bb7d65bbb37c90 DE-627 ger DE-627 rakwb eng QB275-343 QE1-996.5 Michael Asten verfasserin aut Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC Geography. Anthropology. Recreation G Geodesy Geology Aysegul Askan verfasserin aut Shaghayegh Karimzadeh verfasserin aut In Earth, Planets and Space SpringerOpen, 2015 75(2023), 1, Seite 12 (DE-627)353898597 (DE-600)2087663-4 18805981 nnns volume:75 year:2023 number:1 pages:12 https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/article/1be1af5c303a472891bb7d65bbb37c90 kostenfrei https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/toc/1880-5981 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 75 2023 1 12
allfields_unstemmed	10.1186/s40623-023-01801-y doi (DE-627)DOAJ087765411 (DE-599)DOAJ1be1af5c303a472891bb7d65bbb37c90 DE-627 ger DE-627 rakwb eng QB275-343 QE1-996.5 Michael Asten verfasserin aut Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC Geography. Anthropology. Recreation G Geodesy Geology Aysegul Askan verfasserin aut Shaghayegh Karimzadeh verfasserin aut In Earth, Planets and Space SpringerOpen, 2015 75(2023), 1, Seite 12 (DE-627)353898597 (DE-600)2087663-4 18805981 nnns volume:75 year:2023 number:1 pages:12 https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/article/1be1af5c303a472891bb7d65bbb37c90 kostenfrei https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/toc/1880-5981 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 75 2023 1 12
allfieldsGer	10.1186/s40623-023-01801-y doi (DE-627)DOAJ087765411 (DE-599)DOAJ1be1af5c303a472891bb7d65bbb37c90 DE-627 ger DE-627 rakwb eng QB275-343 QE1-996.5 Michael Asten verfasserin aut Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC Geography. Anthropology. Recreation G Geodesy Geology Aysegul Askan verfasserin aut Shaghayegh Karimzadeh verfasserin aut In Earth, Planets and Space SpringerOpen, 2015 75(2023), 1, Seite 12 (DE-627)353898597 (DE-600)2087663-4 18805981 nnns volume:75 year:2023 number:1 pages:12 https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/article/1be1af5c303a472891bb7d65bbb37c90 kostenfrei https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/toc/1880-5981 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 75 2023 1 12
allfieldsSound	10.1186/s40623-023-01801-y doi (DE-627)DOAJ087765411 (DE-599)DOAJ1be1af5c303a472891bb7d65bbb37c90 DE-627 ger DE-627 rakwb eng QB275-343 QE1-996.5 Michael Asten verfasserin aut Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC Geography. Anthropology. Recreation G Geodesy Geology Aysegul Askan verfasserin aut Shaghayegh Karimzadeh verfasserin aut In Earth, Planets and Space SpringerOpen, 2015 75(2023), 1, Seite 12 (DE-627)353898597 (DE-600)2087663-4 18805981 nnns volume:75 year:2023 number:1 pages:12 https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/article/1be1af5c303a472891bb7d65bbb37c90 kostenfrei https://doi.org/10.1186/s40623-023-01801-y kostenfrei https://doaj.org/toc/1880-5981 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 75 2023 1 12
language	English
source	In Earth, Planets and Space 75(2023), 1, Seite 12 volume:75 year:2023 number:1 pages:12
sourceStr	In Earth, Planets and Space 75(2023), 1, Seite 12 volume:75 year:2023 number:1 pages:12
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institution	findex.gbv.de
topic_facet	Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC Geography. Anthropology. Recreation G Geodesy Geology
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container_title	Earth, Planets and Space
authorswithroles_txt_mv	Michael Asten @@aut@@ Aysegul Askan @@aut@@ Shaghayegh Karimzadeh @@aut@@
publishDateDaySort_date	2023-01-01T00:00:00Z
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author	Michael Asten
spellingShingle	Michael Asten misc QB275-343 misc QE1-996.5 misc Site effect misc Microtremor misc Passive seismic misc SPAC misc MMSPAC misc krSPAC misc Geography. Anthropology. Recreation misc G misc Geodesy misc Geology Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods
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topic_title	QB275-343 QE1-996.5 Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods Site effect Microtremor Passive seismic SPAC MMSPAC krSPAC
topic	misc QB275-343 misc QE1-996.5 misc Site effect misc Microtremor misc Passive seismic misc SPAC misc MMSPAC misc krSPAC misc Geography. Anthropology. Recreation misc G misc Geodesy misc Geology
topic_unstemmed	misc QB275-343 misc QE1-996.5 misc Site effect misc Microtremor misc Passive seismic misc SPAC misc MMSPAC misc krSPAC misc Geography. Anthropology. Recreation misc G misc Geodesy misc Geology
topic_browse	misc QB275-343 misc QE1-996.5 misc Site effect misc Microtremor misc Passive seismic misc SPAC misc MMSPAC misc krSPAC misc Geography. Anthropology. Recreation misc G misc Geodesy misc Geology
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title	Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods
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title_full	Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods
author_sort	Michael Asten
journal	Earth, Planets and Space
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author_browse	Michael Asten Aysegul Askan Shaghayegh Karimzadeh
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author-letter	Michael Asten
doi_str_mv	10.1186/s40623-023-01801-y
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title_sort	blind study site assessment of shear-wave velocity at kumamoto city, japan, using direct-fitting spac methods
callnumber	QB275-343
title_auth	Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods
abstract	Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract
abstractGer	Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract
abstract_unstemmed	Abstract The study used data acquired by the ESG6 Blind Prediction Step BP1 Working Group for purposes of facilitating a comparison of interpretation methods for obtaining shear-wave velocity profiles (Vs) from array observations of microtremor (passive seismic) noise. This work uses the direct-fitting MMSPAC method and the krSPAC method on passive seismic data supplied from four seven-station nested triangular arrays with apertures ranging from 1 to 962 m, located within Kumamoto City, Japan. The data allow a useful frequency range of 38 Hz down to 0.3 Hz, giving depth sensitivities from 2 m to < 1000 m. Results are presented as a seven-layer model which has time-averaged shear wave velocities for top 30 m and 300 m of V s30 = 189 m/s and V s300 = 584 m/s, respectively. HVSR spectra show two significant peaks at 1.2 and 0.35 Hz which are indicative of major Vs contrasts at depths 26 m and 750 m. The MMSPAC method (and its krSPAC variant) also proved viable on one asymmetric array where four of the seven stations were corrupted by incoherent low-frequency noise. Indications of a lateral variation in Vs could be detected due to the non-concentric geometry of the four arrays, and also from variations in HVSR spectra at stations of the largest array. Further analysis in step 4 of the blind trials, making use of geological data and a Preferred model supplied to participants, showed apparent discrepancies between the Preferred and our BP1 model for the upper 40 m where a supplied PS log appears to be inconsistent with geological data and the blind BP1 model. At low frequencies 0.5–2.5 Hz dispersion data and the BP1 model suggest that use of the Rayleigh effective mode is superior to use of the fundamental mode in deducing the Vs model at depths below 100 m. The method of direct fitting of model and observed SPAC spectra used in MMSPAC also enabled the use of a bandwidth 0.5–38 Hz for interpretation, which is a wider bandwidth than that achieved by other participants for use of passive seismic data alone. Graphical Abstract
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title_short	Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods
url	https://doi.org/10.1186/s40623-023-01801-y https://doaj.org/article/1be1af5c303a472891bb7d65bbb37c90 https://doaj.org/toc/1880-5981
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