Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement
Abstract The rupture process of the recent moderate-to-large earthquakes in the Zagros area along the Iran plateau is investigated by analysing the strong motion data provided by the Iranian Building and Housing Research Centre (BHRC). The selected dataset includes the largest and deadliest 2017 Mw...
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| Format: | Article |
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Nature Portfolio
2023-10-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-45119-x |
| _version_ | 1797576919664820224 |
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| author | Sahar Nazeri Fatemeh Abdi Amir Ismail Habib Rahimi Aldo Zollo |
| author_facet | Sahar Nazeri Fatemeh Abdi Amir Ismail Habib Rahimi Aldo Zollo |
| author_sort | Sahar Nazeri |
| collection | DOAJ |
| description | Abstract The rupture process of the recent moderate-to-large earthquakes in the Zagros area along the Iran plateau is investigated by analysing the strong motion data provided by the Iranian Building and Housing Research Centre (BHRC). The selected dataset includes the largest and deadliest 2017 Mw 7.3, Iran-Iraq (Ezgeleh) earthquake. The earthquake source parameters (moment magnitude, rupture duration and length, average slip, and static stress drop) are determined using a time-domain, parametric modelling technique based on the time evolution of the P-wave displacement signals. The earthquake source parameters are calculated from simulated triangular moment-rate functions assuming the circular source models for a constant rupture velocity. The anelastic attenuation effect is modelled through the independent frequency-Q parameter ranging from 50 to 200 and accounted for by a post-processing procedure that retrieves the attenuation-corrected, moment-rate triangular shape. Results show that the average static stress-drop with different $${Q}_{P}$$ Q P , varies between <Δσ> = 0.9 (0.7–1.2) MPa and <Δσ> = 1.6 (1.2–2.0) MPa. Overall, in this research, the rupture radius/length empirically scales with the seismic moment with a self-similar, near-constant stress drop of about 1 MPa. Assuming a circular rupture model for the Ezgeleh earthquake, we estimate a moment magnitude of 6.9, rupture duration of 7 s, source radius of 16 km, average slip of about 2 m and static stress drop of 3.4 MPa. |
| first_indexed | 2024-03-10T22:00:39Z |
| format | Article |
| id | doaj.art-ac1473d8236d461f9fdcf07db1c00bd6 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-10T22:00:39Z |
| publishDate | 2023-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-ac1473d8236d461f9fdcf07db1c00bd62023-11-19T12:58:22ZengNature PortfolioScientific Reports2045-23222023-10-0113111210.1038/s41598-023-45119-xEarthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacementSahar Nazeri0Fatemeh Abdi1Amir Ismail2Habib Rahimi3Aldo Zollo4Department of Physics E. Pancini, University of Naples Federico IIInstitute of Geophysics, University of TehranDepartment of Geology, Faculty of Science, Helwan UniversityInstitute of Geophysics, University of TehranDepartment of Physics E. Pancini, University of Naples Federico IIAbstract The rupture process of the recent moderate-to-large earthquakes in the Zagros area along the Iran plateau is investigated by analysing the strong motion data provided by the Iranian Building and Housing Research Centre (BHRC). The selected dataset includes the largest and deadliest 2017 Mw 7.3, Iran-Iraq (Ezgeleh) earthquake. The earthquake source parameters (moment magnitude, rupture duration and length, average slip, and static stress drop) are determined using a time-domain, parametric modelling technique based on the time evolution of the P-wave displacement signals. The earthquake source parameters are calculated from simulated triangular moment-rate functions assuming the circular source models for a constant rupture velocity. The anelastic attenuation effect is modelled through the independent frequency-Q parameter ranging from 50 to 200 and accounted for by a post-processing procedure that retrieves the attenuation-corrected, moment-rate triangular shape. Results show that the average static stress-drop with different $${Q}_{P}$$ Q P , varies between <Δσ> = 0.9 (0.7–1.2) MPa and <Δσ> = 1.6 (1.2–2.0) MPa. Overall, in this research, the rupture radius/length empirically scales with the seismic moment with a self-similar, near-constant stress drop of about 1 MPa. Assuming a circular rupture model for the Ezgeleh earthquake, we estimate a moment magnitude of 6.9, rupture duration of 7 s, source radius of 16 km, average slip of about 2 m and static stress drop of 3.4 MPa.https://doi.org/10.1038/s41598-023-45119-x |
| spellingShingle | Sahar Nazeri Fatemeh Abdi Amir Ismail Habib Rahimi Aldo Zollo Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement Scientific Reports |
| title | Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement |
| title_full | Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement |
| title_fullStr | Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement |
| title_full_unstemmed | Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement |
| title_short | Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement |
| title_sort | earthquake source parameters in zagros region iran from the time evolutive p wave displacement |
| url | https://doi.org/10.1038/s41598-023-45119-x |
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