On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence.
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| Title: | On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence. |
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| Authors: | Sugan, M.1 msugan@inogs.it, Vuan, A.2 avuan@inogs.it |
| Source: | Bulletin of Earthquake Engineering. Oct2014, Vol. 12 Issue 5, p2179-2194. 16p. |
| Subject Terms: | *Mohorovicic discontinuity, *Earthquakes, *Earthquake intensity research, *Earthquake magnitude, *Geophysical surveying services |
| Geographic Terms: | Emilia (Italy), Italy |
| Abstract: | It has been observed that post-critically reflected S-waves and multiples from the Moho discontinuity could play a relevant role on the ground motion due to medium to strong size earthquakes away from the source. Although some studies investigated the correlation between the Moho reflections amplitudes and the damage in the far field, little attention was given to the frequency content of these specific phases and their scaling with magnitude. The 2012 Emilia seismic sequence in northern Italy, recorded by velocimetric and accelerometric networks, is here exploited to investigate Moho reflections and multiples (SmSM). A single station method for group velocity-period estimation, based on the multiple filter technique, is applied to strong motion data to detect SmSM. Amplitude and frequency scaling with magnitude is defined for earthquakes from $$\hbox {Mw}=3.9$$ to $$\hbox {Mw}=5.9$$ . Finally, the ability of SmSM to affect the ground motion for a maximum credible earthquake within the Po plain is investigated by extrapolating observed engineering parameters. Data analysis shows that high amplitude SmSM can be recognized within the Po plain, and at the boundaries between the Po plain and the Alpine chain, at epicentral distances larger than 80 km, in the period range from 0.25 to 3 s and in the group velocity window from about 2.6 to 3.2 km/s. 5 % damped pseudo-spectral accelerations at different periods (0.3, 1.0 and 2.0 s), and Housner intensities, are obtained from data characterized by large amplitude SmSM. A scaling relationship for both pseudo-spectral accelerations and Housner intensities is found for the earthquakes of the 2012 Emilia seismic sequence. $$\hbox {I}_{\mathrm{MCS}}$$ from VII to VIII is estimated, as a result of SmSM amplitude enhancement, at about 100 km for a maximum credible earthquake ( $$\hbox {Mw}=6.7$$ ) in the Po plain, showing that moderate to high damage cloud be caused by these specific phases. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 97942647 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sugan%2C+M%2E%22">Sugan, M.</searchLink><relatesTo>1</relatesTo><i> msugan@inogs.it</i><br /><searchLink fieldCode="AR" term="%22Vuan%2C+A%2E%22">Vuan, A.</searchLink><relatesTo>2</relatesTo><i> avuan@inogs.it</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Earthquake+Engineering%22">Bulletin of Earthquake Engineering</searchLink>. Oct2014, Vol. 12 Issue 5, p2179-2194. 16p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Mohorovicic+discontinuity%22">Mohorovicic discontinuity</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+intensity+research%22">Earthquake intensity research</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+magnitude%22">Earthquake magnitude</searchLink><br />*<searchLink fieldCode="DE" term="%22Geophysical+surveying+services%22">Geophysical surveying services</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Emilia+%28Italy%29%22">Emilia (Italy)</searchLink><br /><searchLink fieldCode="DE" term="%22Italy%22">Italy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: It has been observed that post-critically reflected S-waves and multiples from the Moho discontinuity could play a relevant role on the ground motion due to medium to strong size earthquakes away from the source. Although some studies investigated the correlation between the Moho reflections amplitudes and the damage in the far field, little attention was given to the frequency content of these specific phases and their scaling with magnitude. The 2012 Emilia seismic sequence in northern Italy, recorded by velocimetric and accelerometric networks, is here exploited to investigate Moho reflections and multiples (SmSM). A single station method for group velocity-period estimation, based on the multiple filter technique, is applied to strong motion data to detect SmSM. Amplitude and frequency scaling with magnitude is defined for earthquakes from $$\hbox {Mw}=3.9$$ to $$\hbox {Mw}=5.9$$ . Finally, the ability of SmSM to affect the ground motion for a maximum credible earthquake within the Po plain is investigated by extrapolating observed engineering parameters. Data analysis shows that high amplitude SmSM can be recognized within the Po plain, and at the boundaries between the Po plain and the Alpine chain, at epicentral distances larger than 80 km, in the period range from 0.25 to 3 s and in the group velocity window from about 2.6 to 3.2 km/s. 5 % damped pseudo-spectral accelerations at different periods (0.3, 1.0 and 2.0 s), and Housner intensities, are obtained from data characterized by large amplitude SmSM. A scaling relationship for both pseudo-spectral accelerations and Housner intensities is found for the earthquakes of the 2012 Emilia seismic sequence. $$\hbox {I}_{\mathrm{MCS}}$$ from VII to VIII is estimated, as a result of SmSM amplitude enhancement, at about 100 km for a maximum credible earthquake ( $$\hbox {Mw}=6.7$$ ) in the Po plain, showing that moderate to high damage cloud be caused by these specific phases. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10518-013-9564-y Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 2179 Subjects: – SubjectFull: Mohorovicic discontinuity Type: general – SubjectFull: Earthquakes Type: general – SubjectFull: Earthquake intensity research Type: general – SubjectFull: Earthquake magnitude Type: general – SubjectFull: Geophysical surveying services Type: general – SubjectFull: Emilia (Italy) Type: general – SubjectFull: Italy Type: general Titles: – TitleFull: On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sugan, M. – PersonEntity: Name: NameFull: Vuan, A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2014 Type: published Y: 2014 Identifiers: – Type: issn-print Value: 1570761X Numbering: – Type: volume Value: 12 – Type: issue Value: 5 Titles: – TitleFull: Bulletin of Earthquake Engineering Type: main |
| ResultId | 1 |
