Articles | Volume 10, issue 3
https://doi.org/10.5194/se-10-713-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-10-713-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 May 2019
Research article |
| 23 May 2019
| 23 May 2019
Moment magnitude estimates for central Anatolian earthquakes using coda waves
Department of Geophysical Engineering, the Faculty of Mines, Istanbul
Technical University, 34469 Maslak, Sarıyer, Istanbul, Turkey
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Berkan Özkan, Tuna Eken, Peter Gaebler, and Tuncay Taymaz
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This study estimates source properties by analyzing seismic data of 303 earthquakes (2018–2020) in the Marmara Region, Turkey, and finds a strong correlation between moment-derived coda magnitude (Mw-coda) and moment magnitude (ML). Moreover, the scaled energy increases with seismic moment estimates and shows non-self-similar scaling in earthquake sources.
Gizem Izgi, Tuna Eken, Peter Gaebler, Tülay Kaya-Eken, and Tuncay Taymaz
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In this manuscript, we investigate the complexity of the upper-crustal block of the Central Anatolia region, Türkiye. We present the results of seismic attenuation by examining 1509 local earthquakes recorded at 72 broadband stations and deployed within the framework of a passive seismic experiment. We emphasize the detailed 2D maps of intrinsic and scattering attenuation within the area where two devastating earthquakes (M1 7.8 and M1 7.5 Kahramanmaraş Earthquake Sequence) happened in 2023.
Ashwani Kant Tiwari, Arun Singh, Tuna Eken, and Chandrani Singh
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New splitting measurements are obtained using direct-S waves by correcting source-side contamination using data from southeastern Tibet, near Namcha Barwa. A highly deformed lithospheric and sub-lithospheric mantle reveals fast-axis patterns close to the surficial expressions of the local geology. Significant anisotropy observed at stations where null or no measurements were obtained in earlier studies indicates the importance of using direct-S waves for anisotropic measurements.
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We observed with seismic data in the entire region of Turkey and surroundings the lithosphere–asthenosphere boundary (LAB). It is located generally between 80 and 100km depth outside the subduction zone. No change of the LAB depth was observed across the North and East Anatolian faults. The LAB of the subducting African plate is observed down to about 150km depth from the Aegean to the east of Cyprus, with a tear at Cyprus.
Berkan Özkan, Tuna Eken, Peter Gaebler, and Tuncay Taymaz
Solid Earth, 15, 1303–1317, https://doi.org/10.5194/se-15-1303-2024, https://doi.org/10.5194/se-15-1303-2024, 2024
Short summary
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This study estimates source properties by analyzing seismic data of 303 earthquakes (2018–2020) in the Marmara Region, Turkey, and finds a strong correlation between moment-derived coda magnitude (Mw-coda) and moment magnitude (ML). Moreover, the scaled energy increases with seismic moment estimates and shows non-self-similar scaling in earthquake sources.
Gizem Izgi, Tuna Eken, Peter Gaebler, Tülay Kaya-Eken, and Tuncay Taymaz
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Short summary
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In this manuscript, we investigate the complexity of the upper-crustal block of the Central Anatolia region, Türkiye. We present the results of seismic attenuation by examining 1509 local earthquakes recorded at 72 broadband stations and deployed within the framework of a passive seismic experiment. We emphasize the detailed 2D maps of intrinsic and scattering attenuation within the area where two devastating earthquakes (M1 7.8 and M1 7.5 Kahramanmaraş Earthquake Sequence) happened in 2023.
Ashwani Kant Tiwari, Arun Singh, Tuna Eken, and Chandrani Singh
Solid Earth, 8, 435–452, https://doi.org/10.5194/se-8-435-2017, https://doi.org/10.5194/se-8-435-2017, 2017
Short summary
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New splitting measurements are obtained using direct-S waves by correcting source-side contamination using data from southeastern Tibet, near Namcha Barwa. A highly deformed lithospheric and sub-lithospheric mantle reveals fast-axis patterns close to the surficial expressions of the local geology. Significant anisotropy observed at stations where null or no measurements were obtained in earlier studies indicates the importance of using direct-S waves for anisotropic measurements.
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Short summary
Short summary
We observed with seismic data in the entire region of Turkey and surroundings the lithosphere–asthenosphere boundary (LAB). It is located generally between 80 and 100km depth outside the subduction zone. No change of the LAB depth was observed across the North and East Anatolian faults. The LAB of the subducting African plate is observed down to about 150km depth from the Aegean to the east of Cyprus, with a tear at Cyprus.
Related subject area
Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Seismics, seismology, paleoseismology, geoelectrics, and electromagnetics | Discipline: Seismology
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Quetzalcoatl Rodríguez-Pérez, Víctor Hugo Márquez-Ramírez, and Francisco Ramón Zúñiga
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Linus Villiger, Valentin Samuel Gischig, Joseph Doetsch, Hannes Krietsch, Nathan Oliver Dutler, Mohammadreza Jalali, Benoît Valley, Paul Antony Selvadurai, Arnaud Mignan, Katrin Plenkers, Domenico Giardini, Florian Amann, and Stefan Wiemer
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Our goal is to better understand the evolution of the Earth's outer shell in northeast Brazil. We analyze the propagation properties (anisotropy) of distant seismic waves in order to look for subsurface, large-scale deformation structures. Results show that structures visible at the surface can be traced down to ~100 km depth, that the imprint of the opening of the Atlantic Ocean can be detected along the coast and that the continental interior is anomalous due to a complex deformation history.
Víctor Vilarrasa, Jesus Carrera, Sebastià Olivella, Jonny Rutqvist, and Lyesse Laloui
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To meet the goal of the Paris Agreement to limit temperature increase below 2 ºC, geologic carbon storage (GCS) will be necessary at the gigatonne scale. But to successfully deploy GCS, seismicity induced by CO2 injection should be controlled and maintained below a threshold that does not generate nuisances to the population. We conclude that felt induced seismicity can be minimized provided that a proper site characterization, monitoring and pressure management are performed.
Marius Kriegerowski, Simone Cesca, Matthias Ohrnberger, Torsten Dahm, and Frank Krüger
Solid Earth, 10, 317–328, https://doi.org/10.5194/se-10-317-2019, https://doi.org/10.5194/se-10-317-2019, 2019
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We developed a method that allows to estimate the acoustic attenuation of seismic waves within regions with high earthquake source densities. Attenuation is of high interest as it allows to draw conclusions on the origin of seismic activity. We apply our method to north-west Bohemia, which is regularly affected by earthquake swarms during which thousands of earthquakes are registered within a few days. We find reduced attenuation within the active volume, which may indicate high fluid content.
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Short summary
Proper magnitude estimates for earthquakes can give insight into the seismic energy released at an earthquake source. This is, in fact, essential for better seismic hazard assessments in tectonically active regions. In the present work, I examine local earthquakes in central Anatolia to estimate their moment magnitudes. The main outcome of this study is an empirical relation that can provide a direct physical quantity of seismic energy in the study region.
Proper magnitude estimates for earthquakes can give insight into the seismic energy released at...
