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Research Article
Laurent Bollinger
CEA DAM Île-de-France
Corresponding Author
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The spatial distribution of large earthquakes in Slowly Deforming Continental Regions (SDCR) is poorly documented and, thus, has often been deemed to be random. Unlike in high strain regions, where seismic activity concentrates cyclically along major active faults, earthquakes in SDCR may seem to occur more erratically in space and time. This questions classical fault behavior models, posing paramount issues for seismic hazard assessment. Here, we investigate the M7, 1967, Mogod earthquake in Mongolia, a region recognized as a SDCR. Despite the absence of visible cumulative deformation at the ground surface, we found evidence for at least 3 surface rupturing earthquakes during the last 50,000 years, associated to a slip-rate of 0,06 ± 0,01 mm/yr. These results show that in SDCR, like in faster deforming regions, deformation localizes on specific structures. However, the excessive length of return time for large earthquakes along these structures makes it more difficult to recognize earthquake series, and could conversely lead to the misconception that in SDCR earthquakes would be randomly located. Thus, our result emphasizes the need for systematic appraisal of the potential seismogenic structures in SDCR in order to lower the uncertainties associated with the seismogenic sources in seismic hazard models.
Keywords
Slowly Deforming Continental Regions (SDCR), faster deforming regions, seismogenic sources, seismic hazard models
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CURRENT STATUS: Under Review
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Posted 18 Mar, 2021
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Received 18 Mar, 2021
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Reviewer #2 agreed
On 15 Mar, 2021
Reviewer #3 agreed
On 15 Mar, 2021
Reviewers invited
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On 12 Mar, 2021
Editor invited
On 09 Mar, 2021
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Biophysics
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This preprint is under consideration at Scientific Reports. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Laurent Bollinger
CEA DAM Île-de-France
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 18 Mar, 2021
No community comments so far
Review #1 received
Received 18 Mar, 2021
Reviewer #1 agreed
On 15 Mar, 2021
Reviewer #2 agreed
On 15 Mar, 2021
Reviewer #3 agreed
On 15 Mar, 2021
Reviewers invited
Invitations sent on 14 Mar, 2021
Editor assigned
On 12 Mar, 2021
Editor invited
On 09 Mar, 2021
Submission checks complete
On 09 Mar, 2021
First submitted
On 08 Mar, 2021
Subject Areas
Biophysics
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The spatial distribution of large earthquakes in Slowly Deforming Continental Regions (SDCR) is poorly documented and, thus, has often been deemed to be random. Unlike in high strain regions, where seismic activity concentrates cyclically along major active faults, earthquakes in SDCR may seem to occur more erratically in space and time. This questions classical fault behavior models, posing paramount issues for seismic hazard assessment. Here, we investigate the M7, 1967, Mogod earthquake in Mongolia, a region recognized as a SDCR. Despite the absence of visible cumulative deformation at the ground surface, we found evidence for at least 3 surface rupturing earthquakes during the last 50,000 years, associated to a slip-rate of 0,06 ± 0,01 mm/yr. These results show that in SDCR, like in faster deforming regions, deformation localizes on specific structures. However, the excessive length of return time for large earthquakes along these structures makes it more difficult to recognize earthquake series, and could conversely lead to the misconception that in SDCR earthquakes would be randomly located. Thus, our result emphasizes the need for systematic appraisal of the potential seismogenic structures in SDCR in order to lower the uncertainties associated with the seismogenic sources in seismic hazard models.
Figure 1
Figure 2
Figure 3
Figure 4
This preprint is available for download as a PDF.
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