Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes
All Rights Reserved. Fault dips are usually measured from outcrops in the field or inferred through geodetic or seismological modeling. Here we apply the classic structural geology approach of calculating dip from a fault's 3-D surface trace using recent, high-resolution topography. A test stud...
| Main Authors: | , , , |
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| Format: | Journal article |
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American Geophysical Union
2016
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| _version_ | 1826284603182153728 |
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| author | Zhou, Y Walker, RT Elliott, J Parsons, B |
| author_facet | Zhou, Y Walker, RT Elliott, J Parsons, B |
| author_sort | Zhou, Y |
| collection | OXFORD |
| description | All Rights Reserved. Fault dips are usually measured from outcrops in the field or inferred through geodetic or seismological modeling. Here we apply the classic structural geology approach of calculating dip from a fault's 3-D surface trace using recent, high-resolution topography. A test study applied to the 2010 El Mayor-Cucapah earthquake shows very good agreement between our results and those previously determined from field measurements. To obtain a reliable estimate, a fault segment ≥120 m long with a topographic variation ≥15 m is suggested. We then applied this method to the 2013 Balochistan earthquake, getting dips similar to previous estimates. Our dip estimates show a switch from north to south dipping at the southern end of the main trace, which appears to be a response to local extension within a stepover. We suggest that this previously unidentified geometrical complexity may act as the endpoint of earthquake ruptures for the southern end of the Hoshab fault. |
| first_indexed | 2024-03-07T01:16:19Z |
| format | Journal article |
| id | oxford-uuid:8ecfe41d-96b8-49b5-8dd1-f04d8b6d741c |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:16:19Z |
| publishDate | 2016 |
| publisher | American Geophysical Union |
| record_format | dspace |
| spelling | oxford-uuid:8ecfe41d-96b8-49b5-8dd1-f04d8b6d741c2022-03-26T23:00:05ZMapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8ecfe41d-96b8-49b5-8dd1-f04d8b6d741cSymplectic Elements at OxfordAmerican Geophysical Union2016Zhou, YWalker, RTElliott, JParsons, BAll Rights Reserved. Fault dips are usually measured from outcrops in the field or inferred through geodetic or seismological modeling. Here we apply the classic structural geology approach of calculating dip from a fault's 3-D surface trace using recent, high-resolution topography. A test study applied to the 2010 El Mayor-Cucapah earthquake shows very good agreement between our results and those previously determined from field measurements. To obtain a reliable estimate, a fault segment ≥120 m long with a topographic variation ≥15 m is suggested. We then applied this method to the 2013 Balochistan earthquake, getting dips similar to previous estimates. Our dip estimates show a switch from north to south dipping at the southern end of the main trace, which appears to be a response to local extension within a stepover. We suggest that this previously unidentified geometrical complexity may act as the endpoint of earthquake ruptures for the southern end of the Hoshab fault. |
| spellingShingle | Zhou, Y Walker, RT Elliott, J Parsons, B Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes |
| title | Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes |
| title_full | Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes |
| title_fullStr | Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes |
| title_full_unstemmed | Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes |
| title_short | Mapping 3D fault geometry in earthquakes using high-resolution topography: Examples from the 2010 El Mayor-Cucapah (Mexico) and 2013 Balochistan (Pakistan) earthquakes |
| title_sort | mapping 3d fault geometry in earthquakes using high resolution topography examples from the 2010 el mayor cucapah mexico and 2013 balochistan pakistan earthquakes |
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