{"title":"2023 年 2 月 6 日土耳其 Kahramanmaraş 7.8 Pazarcık 地震的综合地动特征:对衰减效应、场地响应和震源特性的深入研究","authors":"Yuxiang Tang, Karin Şeşetyan, P. Martin Mai","doi":"10.1007/s10518-024-02028-2","DOIUrl":null,"url":null,"abstract":"<div><p>The devastating <span>\\(\\:{M}_{W}\\)</span> 7.8 Pazarcık earthquake on February 6, 2023, profoundly impacted a large region in south-central Türkiye and northwestern Syria, resulting in over 50,000 casualties and widespread damage. To better understand source properties and wave-propagation effects of this event, we analyze the strong ground-motion data recorded at ~ 230 stations. We determine the regional distance-dependent attenuation using the horizontal RotD50 Fourier acceleration amplitude spectrum (FAS) in the frequency range of 0.1–20 Hz. We find an apparent near-source saturation effect which needs to incorporate an additional finite-fault factor for the distance scaling. Uncertainty and sensitivity analyses are considered by variable decay rates in the geometric spreading model. For each decay rate, we derive a corresponding <span>\\(\\:Q\\left(f\\right)\\)</span> model to account for the frequency-dependent anelastic attention. Significant duration of ground motions is modelled for two different measurements based on Arias intensity (<span>\\(\\:{I}_{A}\\)</span>). For site amplification, we construct a model containing both <span>\\(\\:{V}_{S30}\\)</span>-scaling and peak ground acceleration (PGA)-scaling. Source parameters are then determined using a reference Fourier source spectrum at 1.0 km. Specifically, we estimate the mean corner-frequency as <span>\\(\\:{f}_{0}\\)</span>= 0.036 Hz, Brune stress drop as Δσ = 4.79 MPa and the reference rock site κ<sub>0</sub> = 0.051 s. By analyzing near-source pulse-like waveforms, we demonstrate that the mismatch of peak ground velocity (PGV) between our model and close-distance observations is due to the rupture directivity effect. Finally, we compare ground motions of the 2023 <span>\\(\\:{M}_{W}\\)</span> 7.8 event to those of the 2023 <span>\\(\\:{M}_{W}\\)</span> 7.6 Elbistan and the 2020 <span>\\(\\:{M}_{W}\\)</span> 6.7 Sivrice earthquakes. Attenuation effects estimated for the three events are found to be identical between ~ 0.2 and 6.0 Hz, with slight differences in site responses above ~ 5.0 Hz. Source spectra comparisons indicate that the source properties are complicated for all three events. Our comprehensive ground-motion analyses contribute to understanding and modeling regional properties of attenuation, site response, and event-based source characteristics that are important for future region-specific seismic hazard assessment.</p></div>","PeriodicalId":9364,"journal":{"name":"Bulletin of Earthquake Engineering","volume":"22 14","pages":"6829 - 6857"},"PeriodicalIF":3.8000,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10518-024-02028-2.pdf","citationCount":"0","resultStr":"{\"title\":\"Comprehensive ground-motion characterization of the 6 February 2023 \\\\(\\\\:{\\\\varvec{M}}_{\\\\varvec{W}}\\\\) 7.8 Pazarcık earthquake in Kahramanmaraş, Türkiye: insights into attenuation effects, site responses and source properties\",\"authors\":\"Yuxiang Tang, Karin Şeşetyan, P. Martin Mai\",\"doi\":\"10.1007/s10518-024-02028-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The devastating <span>\\\\(\\\\:{M}_{W}\\\\)</span> 7.8 Pazarcık earthquake on February 6, 2023, profoundly impacted a large region in south-central Türkiye and northwestern Syria, resulting in over 50,000 casualties and widespread damage. To better understand source properties and wave-propagation effects of this event, we analyze the strong ground-motion data recorded at ~ 230 stations. We determine the regional distance-dependent attenuation using the horizontal RotD50 Fourier acceleration amplitude spectrum (FAS) in the frequency range of 0.1–20 Hz. We find an apparent near-source saturation effect which needs to incorporate an additional finite-fault factor for the distance scaling. Uncertainty and sensitivity analyses are considered by variable decay rates in the geometric spreading model. For each decay rate, we derive a corresponding <span>\\\\(\\\\:Q\\\\left(f\\\\right)\\\\)</span> model to account for the frequency-dependent anelastic attention. Significant duration of ground motions is modelled for two different measurements based on Arias intensity (<span>\\\\(\\\\:{I}_{A}\\\\)</span>). For site amplification, we construct a model containing both <span>\\\\(\\\\:{V}_{S30}\\\\)</span>-scaling and peak ground acceleration (PGA)-scaling. Source parameters are then determined using a reference Fourier source spectrum at 1.0 km. Specifically, we estimate the mean corner-frequency as <span>\\\\(\\\\:{f}_{0}\\\\)</span>= 0.036 Hz, Brune stress drop as Δσ = 4.79 MPa and the reference rock site κ<sub>0</sub> = 0.051 s. By analyzing near-source pulse-like waveforms, we demonstrate that the mismatch of peak ground velocity (PGV) between our model and close-distance observations is due to the rupture directivity effect. Finally, we compare ground motions of the 2023 <span>\\\\(\\\\:{M}_{W}\\\\)</span> 7.8 event to those of the 2023 <span>\\\\(\\\\:{M}_{W}\\\\)</span> 7.6 Elbistan and the 2020 <span>\\\\(\\\\:{M}_{W}\\\\)</span> 6.7 Sivrice earthquakes. Attenuation effects estimated for the three events are found to be identical between ~ 0.2 and 6.0 Hz, with slight differences in site responses above ~ 5.0 Hz. Source spectra comparisons indicate that the source properties are complicated for all three events. Our comprehensive ground-motion analyses contribute to understanding and modeling regional properties of attenuation, site response, and event-based source characteristics that are important for future region-specific seismic hazard assessment.</p></div>\",\"PeriodicalId\":9364,\"journal\":{\"name\":\"Bulletin of Earthquake Engineering\",\"volume\":\"22 14\",\"pages\":\"6829 - 6857\"},\"PeriodicalIF\":3.8000,\"publicationDate\":\"2024-10-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s10518-024-02028-2.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Earthquake Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10518-024-02028-2\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, GEOLOGICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Earthquake Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10518-024-02028-2","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
Comprehensive ground-motion characterization of the 6 February 2023 \(\:{\varvec{M}}_{\varvec{W}}\) 7.8 Pazarcık earthquake in Kahramanmaraş, Türkiye: insights into attenuation effects, site responses and source properties
The devastating \(\:{M}_{W}\) 7.8 Pazarcık earthquake on February 6, 2023, profoundly impacted a large region in south-central Türkiye and northwestern Syria, resulting in over 50,000 casualties and widespread damage. To better understand source properties and wave-propagation effects of this event, we analyze the strong ground-motion data recorded at ~ 230 stations. We determine the regional distance-dependent attenuation using the horizontal RotD50 Fourier acceleration amplitude spectrum (FAS) in the frequency range of 0.1–20 Hz. We find an apparent near-source saturation effect which needs to incorporate an additional finite-fault factor for the distance scaling. Uncertainty and sensitivity analyses are considered by variable decay rates in the geometric spreading model. For each decay rate, we derive a corresponding \(\:Q\left(f\right)\) model to account for the frequency-dependent anelastic attention. Significant duration of ground motions is modelled for two different measurements based on Arias intensity (\(\:{I}_{A}\)). For site amplification, we construct a model containing both \(\:{V}_{S30}\)-scaling and peak ground acceleration (PGA)-scaling. Source parameters are then determined using a reference Fourier source spectrum at 1.0 km. Specifically, we estimate the mean corner-frequency as \(\:{f}_{0}\)= 0.036 Hz, Brune stress drop as Δσ = 4.79 MPa and the reference rock site κ0 = 0.051 s. By analyzing near-source pulse-like waveforms, we demonstrate that the mismatch of peak ground velocity (PGV) between our model and close-distance observations is due to the rupture directivity effect. Finally, we compare ground motions of the 2023 \(\:{M}_{W}\) 7.8 event to those of the 2023 \(\:{M}_{W}\) 7.6 Elbistan and the 2020 \(\:{M}_{W}\) 6.7 Sivrice earthquakes. Attenuation effects estimated for the three events are found to be identical between ~ 0.2 and 6.0 Hz, with slight differences in site responses above ~ 5.0 Hz. Source spectra comparisons indicate that the source properties are complicated for all three events. Our comprehensive ground-motion analyses contribute to understanding and modeling regional properties of attenuation, site response, and event-based source characteristics that are important for future region-specific seismic hazard assessment.
期刊介绍:
Bulletin of Earthquake Engineering presents original, peer-reviewed papers on research related to the broad spectrum of earthquake engineering. The journal offers a forum for presentation and discussion of such matters as European damaging earthquakes, new developments in earthquake regulations, and national policies applied after major seismic events, including strengthening of existing buildings.
Coverage includes seismic hazard studies and methods for mitigation of risk; earthquake source mechanism and strong motion characterization and their use for engineering applications; geological and geotechnical site conditions under earthquake excitations; cyclic behavior of soils; analysis and design of earth structures and foundations under seismic conditions; zonation and microzonation methodologies; earthquake scenarios and vulnerability assessments; earthquake codes and improvements, and much more.
This is the Official Publication of the European Association for Earthquake Engineering.