Multi-scale analysis and paleoseismic investigations along the Geumwang Fault: an example of integrated approach in paleoseismology in slow tectonic region.
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| Title: | Multi-scale analysis and paleoseismic investigations along the Geumwang Fault: an example of integrated approach in paleoseismology in slow tectonic region. |
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| Authors: | Kim, Chang-Min1,2 (AUTHOR), Lee, Tae-Ho1 (AUTHOR), Choi, Jin-Hyuck1 (AUTHOR), Lee, Hoil1 (AUTHOR), Kim, Dong-Eun1 (AUTHOR) dkim@kigam.re.kr |
| Source: | Geosciences Journal. Oct2024, Vol. 28 Issue 5, p565-582. 18p. |
| Subject Terms: | *Optically stimulated luminescence, *Optical radar, *LIDAR, *Fault zones, *Fluid injection, *Paleoseismology |
| Abstract: | Paleoseismological research for a slowly deforming intraplate fault can provide essential information for understanding not only the spatiotemporal characteristics of past earthquakes but also seismic behavior in the case of long recurrence intervals. To reveal the paleoseismological properties and faulting processes of the intraplate fault, the Geumwang Fault Zone in the central Korean Peninsula, we conducted comprehensive paleoseismological investigations along the fault zone, incorporating geomorphological mapping with airborne light detection and ranging (LiDAR), electrical resistivity tomography (ERT), borehole drilling, trench excavation, optically stimulated luminescence (OSL) dating, and microstructural analysis. Along NE-SW-striking lineaments of the Geumwang Fault Zone, surface deformation is weakly recognized by LiDAR imagery in a damage zone along the northern section of the fault zone (Suha site). Results of ERT and borehole logging at the Suha site suggest a localized zone of low resistivity and unconformity level separation in sedimentary layers, respectively. A trench section excavated along the ERT traverse and borehole sites exposes a fault contact between granite and unconsolidated Quaternary strata comprising boulders (47 ± 3 ka), clayey sand (24 ± 2 ka), pebbly cobbles, coarse sand, and artificial layers from bottom to top. The < 5-cm-wide slip zone is oriented N09°E/85°NW and cuts the granite to the west and the boulder layer to the east. This slip zone that covered by the clayey sand stratum records an apparent vertical offset of ∼1.5 m and has sub-horizontal striations indicating dextral movement. Microstructures at the contact between the granite and the boulder layer support the occurrence of seismic slip propagation along the contact and include injected sedimentary materials, clay-clast aggregates, and fresh, open fractures in quartz and feldspar grains in the boulder layer. The slip zone consists of a < 4.5-cm-wide zone of cataclasite and a < 5-mm-wide principal slip zone (PSZ). Microstructures in the slip zone and sediments near the slip zone include seismic-slip indicators of pressurized gouge materials and fluid injection within PSZ, and deformed sediments. These reveal that the slip zone underwent repeated seismic slip events during uplift to the surface. Our paleoseismological analyses with microstructures show that the boulder layer was cut by strike-slip faulting with a minor vertical component between 47–24 ka, following which the overlying sediments were deposited along the exposed fault scarp as incision fill. The results show that microstructural observations can provide key information on the deformation of unconsolidated sediments and on the nature and timing of seismic faulting. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 179573779 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Multi-scale analysis and paleoseismic investigations along the Geumwang Fault: an example of integrated approach in paleoseismology in slow tectonic region. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kim%2C+Chang-Min%22">Kim, Chang-Min</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Tae-Ho%22">Lee, Tae-Ho</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Choi%2C+Jin-Hyuck%22">Choi, Jin-Hyuck</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Hoil%22">Lee, Hoil</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+Dong-Eun%22">Kim, Dong-Eun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dkim@kigam.re.kr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geosciences+Journal%22">Geosciences Journal</searchLink>. Oct2024, Vol. 28 Issue 5, p565-582. 18p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Optically+stimulated+luminescence%22">Optically stimulated luminescence</searchLink><br />*<searchLink fieldCode="DE" term="%22Optical+radar%22">Optical radar</searchLink><br />*<searchLink fieldCode="DE" term="%22LIDAR%22">LIDAR</searchLink><br />*<searchLink fieldCode="DE" term="%22Fault+zones%22">Fault zones</searchLink><br />*<searchLink fieldCode="DE" term="%22Fluid+injection%22">Fluid injection</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleoseismology%22">Paleoseismology</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Paleoseismological research for a slowly deforming intraplate fault can provide essential information for understanding not only the spatiotemporal characteristics of past earthquakes but also seismic behavior in the case of long recurrence intervals. To reveal the paleoseismological properties and faulting processes of the intraplate fault, the Geumwang Fault Zone in the central Korean Peninsula, we conducted comprehensive paleoseismological investigations along the fault zone, incorporating geomorphological mapping with airborne light detection and ranging (LiDAR), electrical resistivity tomography (ERT), borehole drilling, trench excavation, optically stimulated luminescence (OSL) dating, and microstructural analysis. Along NE-SW-striking lineaments of the Geumwang Fault Zone, surface deformation is weakly recognized by LiDAR imagery in a damage zone along the northern section of the fault zone (Suha site). Results of ERT and borehole logging at the Suha site suggest a localized zone of low resistivity and unconformity level separation in sedimentary layers, respectively. A trench section excavated along the ERT traverse and borehole sites exposes a fault contact between granite and unconsolidated Quaternary strata comprising boulders (47 ± 3 ka), clayey sand (24 ± 2 ka), pebbly cobbles, coarse sand, and artificial layers from bottom to top. The < 5-cm-wide slip zone is oriented N09°E/85°NW and cuts the granite to the west and the boulder layer to the east. This slip zone that covered by the clayey sand stratum records an apparent vertical offset of ∼1.5 m and has sub-horizontal striations indicating dextral movement. Microstructures at the contact between the granite and the boulder layer support the occurrence of seismic slip propagation along the contact and include injected sedimentary materials, clay-clast aggregates, and fresh, open fractures in quartz and feldspar grains in the boulder layer. The slip zone consists of a < 4.5-cm-wide zone of cataclasite and a < 5-mm-wide principal slip zone (PSZ). Microstructures in the slip zone and sediments near the slip zone include seismic-slip indicators of pressurized gouge materials and fluid injection within PSZ, and deformed sediments. These reveal that the slip zone underwent repeated seismic slip events during uplift to the surface. Our paleoseismological analyses with microstructures show that the boulder layer was cut by strike-slip faulting with a minor vertical component between 47–24 ka, following which the overlying sediments were deposited along the exposed fault scarp as incision fill. The results show that microstructural observations can provide key information on the deformation of unconsolidated sediments and on the nature and timing of seismic faulting. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12303-024-0029-x Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 565 Subjects: – SubjectFull: Optically stimulated luminescence Type: general – SubjectFull: Optical radar Type: general – SubjectFull: LIDAR Type: general – SubjectFull: Fault zones Type: general – SubjectFull: Fluid injection Type: general – SubjectFull: Paleoseismology Type: general Titles: – TitleFull: Multi-scale analysis and paleoseismic investigations along the Geumwang Fault: an example of integrated approach in paleoseismology in slow tectonic region. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kim, Chang-Min – PersonEntity: Name: NameFull: Lee, Tae-Ho – PersonEntity: Name: NameFull: Choi, Jin-Hyuck – PersonEntity: Name: NameFull: Lee, Hoil – PersonEntity: Name: NameFull: Kim, Dong-Eun IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 12264806 Numbering: – Type: volume Value: 28 – Type: issue Value: 5 Titles: – TitleFull: Geosciences Journal Type: main |
| ResultId | 1 |
