The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes
Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source p...
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Gespeichert in:
| Autor*in: |
Dabouz, G. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2021 |
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| Schlagwörter: |
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| Anmerkung: |
© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 |
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| Übergeordnetes Werk: |
Enthalten in: Pure and applied geophysics - Springer International Publishing, 1964, 178(2021), 9 vom: 09. Aug., Seite 3313-3337 |
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| Übergeordnetes Werk: |
volume:178 ; year:2021 ; number:9 ; day:09 ; month:08 ; pages:3313-3337 |
| Links: |
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| DOI / URN: |
10.1007/s00024-021-02827-7 |
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OLC2077128895 |
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| 520 | |a Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. | ||
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10.1007/s00024-021-02827-7 doi (DE-627)OLC2077128895 (DE-He213)s00024-021-02827-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Dabouz, G. verfasserin (orcid)0000-0003-4581-1598 aut The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. Waveform modeling source parameters Medea seismicity Algeria Tellian Atlas Coulomb stress transfer Beldjoudi, H. aut Delouis, B. aut Boulahia, O. aut Mohammedi, Y. aut Yelles-Chaouche, A. aut Enthalten in Pure and applied geophysics Springer International Publishing, 1964 178(2021), 9 vom: 09. Aug., Seite 3313-3337 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:178 year:2021 number:9 day:09 month:08 pages:3313-3337 https://doi.org/10.1007/s00024-021-02827-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_70 GBV_ILN_601 AR 178 2021 9 09 08 3313-3337 |
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10.1007/s00024-021-02827-7 doi (DE-627)OLC2077128895 (DE-He213)s00024-021-02827-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Dabouz, G. verfasserin (orcid)0000-0003-4581-1598 aut The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. Waveform modeling source parameters Medea seismicity Algeria Tellian Atlas Coulomb stress transfer Beldjoudi, H. aut Delouis, B. aut Boulahia, O. aut Mohammedi, Y. aut Yelles-Chaouche, A. aut Enthalten in Pure and applied geophysics Springer International Publishing, 1964 178(2021), 9 vom: 09. Aug., Seite 3313-3337 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:178 year:2021 number:9 day:09 month:08 pages:3313-3337 https://doi.org/10.1007/s00024-021-02827-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_70 GBV_ILN_601 AR 178 2021 9 09 08 3313-3337 |
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10.1007/s00024-021-02827-7 doi (DE-627)OLC2077128895 (DE-He213)s00024-021-02827-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Dabouz, G. verfasserin (orcid)0000-0003-4581-1598 aut The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. Waveform modeling source parameters Medea seismicity Algeria Tellian Atlas Coulomb stress transfer Beldjoudi, H. aut Delouis, B. aut Boulahia, O. aut Mohammedi, Y. aut Yelles-Chaouche, A. aut Enthalten in Pure and applied geophysics Springer International Publishing, 1964 178(2021), 9 vom: 09. Aug., Seite 3313-3337 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:178 year:2021 number:9 day:09 month:08 pages:3313-3337 https://doi.org/10.1007/s00024-021-02827-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_70 GBV_ILN_601 AR 178 2021 9 09 08 3313-3337 |
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10.1007/s00024-021-02827-7 doi (DE-627)OLC2077128895 (DE-He213)s00024-021-02827-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Dabouz, G. verfasserin (orcid)0000-0003-4581-1598 aut The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. Waveform modeling source parameters Medea seismicity Algeria Tellian Atlas Coulomb stress transfer Beldjoudi, H. aut Delouis, B. aut Boulahia, O. aut Mohammedi, Y. aut Yelles-Chaouche, A. aut Enthalten in Pure and applied geophysics Springer International Publishing, 1964 178(2021), 9 vom: 09. Aug., Seite 3313-3337 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:178 year:2021 number:9 day:09 month:08 pages:3313-3337 https://doi.org/10.1007/s00024-021-02827-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_70 GBV_ILN_601 AR 178 2021 9 09 08 3313-3337 |
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10.1007/s00024-021-02827-7 doi (DE-627)OLC2077128895 (DE-He213)s00024-021-02827-7-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Dabouz, G. verfasserin (orcid)0000-0003-4581-1598 aut The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. Waveform modeling source parameters Medea seismicity Algeria Tellian Atlas Coulomb stress transfer Beldjoudi, H. aut Delouis, B. aut Boulahia, O. aut Mohammedi, Y. aut Yelles-Chaouche, A. aut Enthalten in Pure and applied geophysics Springer International Publishing, 1964 178(2021), 9 vom: 09. Aug., Seite 3313-3337 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:178 year:2021 number:9 day:09 month:08 pages:3313-3337 https://doi.org/10.1007/s00024-021-02827-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_70 GBV_ILN_601 AR 178 2021 9 09 08 3313-3337 |
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the 2007 medea seismic sequence, north-central algeria: source parameters, stress tensor, and static stress changes |
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The 2007 Medea Seismic Sequence, North-Central Algeria: Source Parameters, Stress Tensor, and Static Stress Changes |
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Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 |
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Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 |
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Abstract Dense seismic networks provide the opportunity to better understand seismogenic processes in tectonically active regions. The Algerian Digital Seismic Network was strengthened following the 10 October 1980 Ms 7.3 El Asnam and 21 May 2003 Mw 6.8 Bournerdes earthquakes, such that the source parameters of small- to moderate-magnitude earthquakes in northern Algeria can now be computed. Here we examine the 2007 seismic sequence recorded in the Medea region (north-central part of Algeria). We calculate the seismic sources of three moderate events that occurred between May and August 2007 using near-field waveform modeling, and obtain moment magnitudes of 4.4, 4.1, and 4.6, with fault planes oriented N63°E, N15°E, and N219°E, respectively. We use displacement spectra to estimate the corner frequency fc and spectral flat level then use these to recalculate the seismic moment and moment magnitude. The stress tensor obtained by inverting 13 focal mechanisms from events near the 2007 sequence exhibits a well-constrained compressional axis with a subhorizontal N335°E-trending $ σ_{1} $ axis (plunge 7°). We calculate the static stress changes to understand the connections between these three events. The results indicate an interaction between the faults related to these events during the earthquake sequence. We conclude that these events likely occurred on the unstudied extensions of mapped faults, and that the epicentral area therefore has moderate seismogenic potential. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021 |
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