Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan
Abstract Drilling investigations and structural analysis of drill cores reveal that a fault gouge zone of 10–30 cm in width was observed at depths of ~260 to 900 m in nine drill holes that intersected the Nojima Fault (NF), on which the 1995 Mw 6.9 Kobe (Japan) earthquake occurred. Logging data and...
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Wiley
2019-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL081927 |
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| author | Aiming Lin Takafumi Nishiwaki |
| author_facet | Aiming Lin Takafumi Nishiwaki |
| author_sort | Aiming Lin |
| collection | DOAJ |
| description | Abstract Drilling investigations and structural analysis of drill cores reveal that a fault gouge zone of 10–30 cm in width was observed at depths of ~260 to 900 m in nine drill holes that intersected the Nojima Fault (NF), on which the 1995 Mw 6.9 Kobe (Japan) earthquake occurred. Logging data and an analysis of mesostructures and microstructures in drill cores show that (i) a ~60‐m wide fault damage zone containing a 10‐ to 30‐cm‐thick fault gouge zone developed in the NF, (ii) the fault gouge zone can be divided into 11–20 thin layers of different color, and (iii) the individually colored layers contain different color breccias of fault gouge that are offset and/or cut by cracks and crack‐filled calcite and quartz veinlets. Our results reveal that the fault gouge zone probably records more than 11–20 paleoseismic faulting events along the NF during the late Pleistocene‐Holocene. |
| format | Article |
| id | doaj-art-669c70bbbb1a416daa83dfb80cecaa3a |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-669c70bbbb1a416daa83dfb80cecaa3a2025-08-20T03:09:45ZengWileyGeophysical Research Letters0094-82761944-80072019-02-014631276128310.1029/2019GL081927Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW JapanAiming Lin0Takafumi Nishiwaki1Department of Geophysics, Graduate School of Science Kyoto University Kyoto JapanDepartment of Geophysics, Graduate School of Science Kyoto University Kyoto JapanAbstract Drilling investigations and structural analysis of drill cores reveal that a fault gouge zone of 10–30 cm in width was observed at depths of ~260 to 900 m in nine drill holes that intersected the Nojima Fault (NF), on which the 1995 Mw 6.9 Kobe (Japan) earthquake occurred. Logging data and an analysis of mesostructures and microstructures in drill cores show that (i) a ~60‐m wide fault damage zone containing a 10‐ to 30‐cm‐thick fault gouge zone developed in the NF, (ii) the fault gouge zone can be divided into 11–20 thin layers of different color, and (iii) the individually colored layers contain different color breccias of fault gouge that are offset and/or cut by cracks and crack‐filled calcite and quartz veinlets. Our results reveal that the fault gouge zone probably records more than 11–20 paleoseismic faulting events along the NF during the late Pleistocene‐Holocene.https://doi.org/10.1029/2019GL081927fault gouge zonemesostructure and microstructureseismic slipNojima faultdrill coreearthquake fossil |
| spellingShingle | Aiming Lin Takafumi Nishiwaki Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan Geophysical Research Letters fault gouge zone mesostructure and microstructure seismic slip Nojima fault drill core earthquake fossil |
| title | Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan |
| title_full | Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan |
| title_fullStr | Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan |
| title_full_unstemmed | Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan |
| title_short | Repeated Seismic Slipping Events Recorded in a Fault Gouge Zone: Evidence From the Nojima Fault Drill Holes, SW Japan |
| title_sort | repeated seismic slipping events recorded in a fault gouge zone evidence from the nojima fault drill holes sw japan |
| topic | fault gouge zone mesostructure and microstructure seismic slip Nojima fault drill core earthquake fossil |
| url | https://doi.org/10.1029/2019GL081927 |
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