A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake
We analyze the spatial relationship of relocated aftershocks to the principal rupture planes of the Mw 7.3 1992 Landers mainshock from a structural point of view. We find that the aftershocks constitute primarily a several-kilometer-wide damage zone centered on the mainshock rupture planes. The inte...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | English |
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2013
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| Online Access: | https://hdl.handle.net/10356/91349 http://hdl.handle.net/10220/9244 |
| _version_ | 1824454732442238976 |
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| author | Liu, Jing Sieh, Kerry Hauksson, Egill |
| author_facet | Liu, Jing Sieh, Kerry Hauksson, Egill |
| author_sort | Liu, Jing |
| collection | NTU |
| description | We analyze the spatial relationship of relocated aftershocks to the principal rupture planes of the Mw 7.3 1992 Landers mainshock from a structural point of view. We find that the aftershocks constitute primarily a several-kilometer-wide damage zone centered on the mainshock rupture planes. The intensity of damage decreases away from the principal faults. Less than half of the aftershocks occurred within 1 km of the mainshock planes, and perhaps only 5% of the aftershocks are candidates for rerupture of the mainshock faults. Moreover, it seems that aftershocks along the Landers rupture have b-values that correlate well with the complexity of the mainshock rupture. Low b-values occur along segments that are simple, whereas higher b-values correlate with sections that are more complex. Thus, structural complexity appears to correlate with a greater relative abundance of small earthquakes. These observations imply that aftershock populations reflect fault populations in the medium surrounding the principal faults rather than the behavior of the mainshock planes themselves. |
| first_indexed | 2025-02-19T03:26:59Z |
| format | Journal Article |
| id | ntu-10356/91349 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:26:59Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/913492020-03-07T12:45:24Z A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake Liu, Jing Sieh, Kerry Hauksson, Egill DRNTU::Science::Geology::Volcanoes and earthquakes We analyze the spatial relationship of relocated aftershocks to the principal rupture planes of the Mw 7.3 1992 Landers mainshock from a structural point of view. We find that the aftershocks constitute primarily a several-kilometer-wide damage zone centered on the mainshock rupture planes. The intensity of damage decreases away from the principal faults. Less than half of the aftershocks occurred within 1 km of the mainshock planes, and perhaps only 5% of the aftershocks are candidates for rerupture of the mainshock faults. Moreover, it seems that aftershocks along the Landers rupture have b-values that correlate well with the complexity of the mainshock rupture. Low b-values occur along segments that are simple, whereas higher b-values correlate with sections that are more complex. Thus, structural complexity appears to correlate with a greater relative abundance of small earthquakes. These observations imply that aftershock populations reflect fault populations in the medium surrounding the principal faults rather than the behavior of the mainshock planes themselves. 2013-02-25T06:25:52Z 2019-12-06T18:04:04Z 2013-02-25T06:25:52Z 2019-12-06T18:04:04Z 2003 2003 Journal Article Liu, J., Sieh, K., & Hauksson, E. (2003). A Structural Interpretation of the Aftershock "Cloud" of the 1992 Mw 7.3 Landers Earthquake. Bulletin of the Seismological Society of America, 93(3), 1333-1344. 0037-1106 https://hdl.handle.net/10356/91349 http://hdl.handle.net/10220/9244 10.1785/0120020060 en Bulletin of the seismological society of America © 2003 Seismological Society of America |
| spellingShingle | DRNTU::Science::Geology::Volcanoes and earthquakes Liu, Jing Sieh, Kerry Hauksson, Egill A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake |
| title | A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake |
| title_full | A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake |
| title_fullStr | A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake |
| title_full_unstemmed | A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake |
| title_short | A structural interpretation of the aftershock "cloud" of the 1992 Mw 7.3 Landers earthquake |
| title_sort | structural interpretation of the aftershock cloud of the 1992 mw 7 3 landers earthquake |
| topic | DRNTU::Science::Geology::Volcanoes and earthquakes |
| url | https://hdl.handle.net/10356/91349 http://hdl.handle.net/10220/9244 |
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