The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake
Seismic wave propagation in subsurface media endures from absorption, which can be evaluated by the seismic quality factor Q (Q-factor). Absorption is frequency-dependent. Lower frequencies are absorbed less, while higher frequencies are absorbed more. Therefore, the Q Factor should be determined in...
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| Format: | Article |
| Language: | English |
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General Directorate of Mineral Research and Exploration
2021-12-01
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| Series: | Bulletin of the Mineral Research and Exploration |
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| Online Access: | https://dergipark.org.tr/tr/pub/bulletinofmre/issue/64214/841785 |
| _version_ | 1828019146451845120 |
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| author | Muammer Tün |
| author_facet | Muammer Tün |
| author_sort | Muammer Tün |
| collection | DOAJ |
| description | Seismic wave propagation in subsurface media endures from absorption, which can be evaluated by the seismic quality factor Q (Q-factor). Absorption is frequency-dependent. Lower frequencies are absorbed less, while higher frequencies are absorbed more. Therefore, the Q Factor should be determined in the frequency domain. Q-factor is determined by the slope of the natural logarithm of the output-input signals ratio. Surface waves (Rayleigh and Love waves) are particularly important, as they are the more destructive phases of an earthquake. This study was focused on the Q-factor computation of the surface waves and demonstrated that the determination of the Q-factor is not affected from the dispersive properties of the surface waves. Data were obtained from surface wave signals of earthquake recorded at Eskişehir Technical University Seismic Network - EstuNet. The obtained Q-factor values represent the average values of the rocks that the waves cross between the input and output stations. Finally, the Q-factor map to the Peak Ground Acceleration (PGA) map using the M=4.3, 17.01.2015 Eskişehir earthquake data was compared. These records, show the arrival time of the earthquake from the epicenter to the stations of the seismic waves, and the peak ground acceleration values. In this study, local site effects of EstuNet accelerometric stations have been calculated by using the Standard Spectral Ratio (SSR) method. It is concluded that an inverse relationship exists between the computed Q-factor and measured PGA values. Therefore, the sites where the Q factor is very low should be analyzed in more detail in ground-based earthquake risk assessments. |
| first_indexed | 2024-04-10T11:13:52Z |
| format | Article |
| id | doaj.art-8e5b78325f144b81bf55acfb7eaff5f6 |
| institution | Directory Open Access Journal |
| issn | 0026-4563 |
| language | English |
| last_indexed | 2024-04-10T11:13:52Z |
| publishDate | 2021-12-01 |
| publisher | General Directorate of Mineral Research and Exploration |
| record_format | Article |
| series | Bulletin of the Mineral Research and Exploration |
| spelling | doaj.art-8e5b78325f144b81bf55acfb7eaff5f62023-02-15T16:18:56ZengGeneral Directorate of Mineral Research and ExplorationBulletin of the Mineral Research and Exploration0026-45632021-12-0116616612714410.19111/bulletinofmre.84178576The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir EarthquakeMuammer Tün0Eskişehir Technical University, Institute of Earth and Space Sciences, Department of Earth Sciences and Earthquake Engineering, Eskişehir, TurkeySeismic wave propagation in subsurface media endures from absorption, which can be evaluated by the seismic quality factor Q (Q-factor). Absorption is frequency-dependent. Lower frequencies are absorbed less, while higher frequencies are absorbed more. Therefore, the Q Factor should be determined in the frequency domain. Q-factor is determined by the slope of the natural logarithm of the output-input signals ratio. Surface waves (Rayleigh and Love waves) are particularly important, as they are the more destructive phases of an earthquake. This study was focused on the Q-factor computation of the surface waves and demonstrated that the determination of the Q-factor is not affected from the dispersive properties of the surface waves. Data were obtained from surface wave signals of earthquake recorded at Eskişehir Technical University Seismic Network - EstuNet. The obtained Q-factor values represent the average values of the rocks that the waves cross between the input and output stations. Finally, the Q-factor map to the Peak Ground Acceleration (PGA) map using the M=4.3, 17.01.2015 Eskişehir earthquake data was compared. These records, show the arrival time of the earthquake from the epicenter to the stations of the seismic waves, and the peak ground acceleration values. In this study, local site effects of EstuNet accelerometric stations have been calculated by using the Standard Spectral Ratio (SSR) method. It is concluded that an inverse relationship exists between the computed Q-factor and measured PGA values. Therefore, the sites where the Q factor is very low should be analyzed in more detail in ground-based earthquake risk assessments.https://dergipark.org.tr/tr/pub/bulletinofmre/issue/64214/841785quality seismic factorestunet seismic networkstrong ground motionpeak ground accelerationeskişehir graben. |
| spellingShingle | Muammer Tün The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake Bulletin of the Mineral Research and Exploration quality seismic factor estunet seismic network strong ground motion peak ground acceleration eskişehir graben. |
| title | The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake |
| title_full | The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake |
| title_fullStr | The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake |
| title_full_unstemmed | The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake |
| title_short | The relationship between seismic quality factor and peak ground acceleration, a case study: M=4.3, 17.01.2015 Eskişehir Earthquake |
| title_sort | relationship between seismic quality factor and peak ground acceleration a case study m 4 3 17 01 2015 eskisehir earthquake |
| topic | quality seismic factor estunet seismic network strong ground motion peak ground acceleration eskişehir graben. |
| url | https://dergipark.org.tr/tr/pub/bulletinofmre/issue/64214/841785 |
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