Directionality of average spectral acceleration, SaAvg, in the 2023 Kahramanmaras, Türkiye earthquake sequence.
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| Title: | Directionality of average spectral acceleration, SaAvg, in the 2023 Kahramanmaras, Türkiye earthquake sequence. |
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| Authors: | Liapopoulou, Maria1 (AUTHOR), Dávalos, Héctor2 (AUTHOR) hdavalos@up.edu.mx, Bravo-Haro, Miguel3 (AUTHOR), Heresi, Pablo4 (AUTHOR), Miranda, Eduardo5 (AUTHOR) |
| Source: | Bulletin of Earthquake Engineering. Feb2025, Vol. 23 Issue 3, p1083-1105. 23p. |
| Subject Terms: | *Ground motion, *Earthquakes, *Dispersion (Chemistry) |
| Geographic Terms: | Turkey |
| Abstract: | This study investigates the directionality of spectral accelerations averaged over a period range in 453 ground motions that were recorded in the Turkish strong-motion accelerograph network during the 2023 Kahramanmaraş earthquake sequence. This measure of ground motion intensity, referred to as SaAvg, is computed by using 5%-damped pseudo-acceleration spectral ordinates averaged over a period range from one-fifth to three times the period of interest. Several studies have shown that, compared to the typically used single spectral ordinate, this intensity measure is significantly better correlated with structural damage and, in particular, with structural collapse. Additionally, it is also more sufficient with respect to earthquake magnitude and distance to the source, less sensitive to record scaling, and more predictable. The variation of SaAvg with changes in orientation is carefully studied using two normalised parameters. It is found that, similarly to the directionality of individual spectral ordinates, the directionality of SaAvg also increases with increasing period of the oscillator; however, the level of directionality is smaller. Nonetheless, the dispersion on normalised parameters characterising directionality is in the order of half of that in the directionality of individual spectral ordinates, thus making the directionality of SaAvg significantly more predictable than that of Sa. Models for estimating the directionality in SaAvg are proposed. This study also evaluated for the first time the orientation of maximum SaAvg. Similarly to the orientation of maximum oscillator response in strike-slip earthquakes, it is found that the orientation of maximum SaAvg tends to occur close to the transverse direction from the source. In particular, this study shows that computing the transverse orientation with respect to the point of maximum slip in a finite rupture model leads to better results than doing it using the epicentre. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 183537082 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Directionality of average spectral acceleration, SaAvg, in the 2023 Kahramanmaras, Türkiye earthquake sequence. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Liapopoulou%2C+Maria%22">Liapopoulou, Maria</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dávalos%2C+Héctor%22">Dávalos, Héctor</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> hdavalos@up.edu.mx</i><br /><searchLink fieldCode="AR" term="%22Bravo-Haro%2C+Miguel%22">Bravo-Haro, Miguel</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Heresi%2C+Pablo%22">Heresi, Pablo</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Miranda%2C+Eduardo%22">Miranda, Eduardo</searchLink><relatesTo>5</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Earthquake+Engineering%22">Bulletin of Earthquake Engineering</searchLink>. Feb2025, Vol. 23 Issue 3, p1083-1105. 23p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Ground+motion%22">Ground motion</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink><br />*<searchLink fieldCode="DE" term="%22Dispersion+%28Chemistry%29%22">Dispersion (Chemistry)</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Turkey%22">Turkey</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study investigates the directionality of spectral accelerations averaged over a period range in 453 ground motions that were recorded in the Turkish strong-motion accelerograph network during the 2023 Kahramanmaraş earthquake sequence. This measure of ground motion intensity, referred to as SaAvg, is computed by using 5%-damped pseudo-acceleration spectral ordinates averaged over a period range from one-fifth to three times the period of interest. Several studies have shown that, compared to the typically used single spectral ordinate, this intensity measure is significantly better correlated with structural damage and, in particular, with structural collapse. Additionally, it is also more sufficient with respect to earthquake magnitude and distance to the source, less sensitive to record scaling, and more predictable. The variation of SaAvg with changes in orientation is carefully studied using two normalised parameters. It is found that, similarly to the directionality of individual spectral ordinates, the directionality of SaAvg also increases with increasing period of the oscillator; however, the level of directionality is smaller. Nonetheless, the dispersion on normalised parameters characterising directionality is in the order of half of that in the directionality of individual spectral ordinates, thus making the directionality of SaAvg significantly more predictable than that of Sa. Models for estimating the directionality in SaAvg are proposed. This study also evaluated for the first time the orientation of maximum SaAvg. Similarly to the orientation of maximum oscillator response in strike-slip earthquakes, it is found that the orientation of maximum SaAvg tends to occur close to the transverse direction from the source. In particular, this study shows that computing the transverse orientation with respect to the point of maximum slip in a finite rupture model leads to better results than doing it using the epicentre. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10518-024-02047-z Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 23 StartPage: 1083 Subjects: – SubjectFull: Ground motion Type: general – SubjectFull: Earthquakes Type: general – SubjectFull: Dispersion (Chemistry) Type: general – SubjectFull: Turkey Type: general Titles: – TitleFull: Directionality of average spectral acceleration, SaAvg, in the 2023 Kahramanmaras, Türkiye earthquake sequence. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Liapopoulou, Maria – PersonEntity: Name: NameFull: Dávalos, Héctor – PersonEntity: Name: NameFull: Bravo-Haro, Miguel – PersonEntity: Name: NameFull: Heresi, Pablo – PersonEntity: Name: NameFull: Miranda, Eduardo IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 1570761X Numbering: – Type: volume Value: 23 – Type: issue Value: 3 Titles: – TitleFull: Bulletin of Earthquake Engineering Type: main |
| ResultId | 1 |
