Lateral offset quality rating along low slip rate faults: Application to the Alhama de Murcia Fault (SE Iberian Peninsula)

Marta Ferrater, Ramon Arrowsmith, Eulàlia Masana

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Seismic hazard assessment of strike-slip faults is based partly on the identification and mapping of landforms laterally offset due to fault activity. The characterization of these features affected by slow-moving faults is challenging relative to studies emphasizing rapidly slipping faults. We propose a methodology for scoring fault offsets based on subjective and objective qualities. We apply this methodology to the Alhama de Murcia fault (SE Iberian Peninsula) where we identify 138 offset features that we mapped on a high-resolution (0.5 × 0.5 m pixel size) Digital Elevation Model (DEM). The amount of offset, the uncertainty of the measurement, the subjective and objective qualities, and the parameters that affect objective quality are independent variables, suggesting that our methodological scoring approach is good. Based on the offset measurements and qualifications we calculate the Cumulative Offset Probability Density (COPD) for the entire fault and for each fault segment. The COPD for the segments differ from each other. Tentative interpretation of the COPDs implies that the slip rate varies from one segment to the other (we assume that channels with the same amount of offset were incised synchronously). We compare the COPD with climate proxy curves (aligning using the very limited age control) to test if entrenchment events are coincident with climatic changes. Channel incision along one of the traces in Lorca-Totana segment may be related to transitions from glacial to interglacial periods.

Original languageEnglish (US)
Pages (from-to)14827-14852
Number of pages26
JournalRemote Sensing
Volume7
Issue number11
DOIs
StatePublished - 2015

Fingerprint

slip rate
methodology
hazard assessment
seismic hazard
strike-slip fault
interglacial
landform
digital elevation model
pixel
climate change
climate
quality objective

Keywords

  • Alhama de Murcia fault
  • High-resolution DEM
  • Offset scoring
  • Strike-slip fault

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Lateral offset quality rating along low slip rate faults : Application to the Alhama de Murcia Fault (SE Iberian Peninsula). / Ferrater, Marta; Arrowsmith, Ramon; Masana, Eulàlia.

In: Remote Sensing, Vol. 7, No. 11, 2015, p. 14827-14852.

Research output: Contribution to journalArticle

@article{e7f64ff23b2c445fa4c2996b803c0116,
title = "Lateral offset quality rating along low slip rate faults: Application to the Alhama de Murcia Fault (SE Iberian Peninsula)",
abstract = "Seismic hazard assessment of strike-slip faults is based partly on the identification and mapping of landforms laterally offset due to fault activity. The characterization of these features affected by slow-moving faults is challenging relative to studies emphasizing rapidly slipping faults. We propose a methodology for scoring fault offsets based on subjective and objective qualities. We apply this methodology to the Alhama de Murcia fault (SE Iberian Peninsula) where we identify 138 offset features that we mapped on a high-resolution (0.5 × 0.5 m pixel size) Digital Elevation Model (DEM). The amount of offset, the uncertainty of the measurement, the subjective and objective qualities, and the parameters that affect objective quality are independent variables, suggesting that our methodological scoring approach is good. Based on the offset measurements and qualifications we calculate the Cumulative Offset Probability Density (COPD) for the entire fault and for each fault segment. The COPD for the segments differ from each other. Tentative interpretation of the COPDs implies that the slip rate varies from one segment to the other (we assume that channels with the same amount of offset were incised synchronously). We compare the COPD with climate proxy curves (aligning using the very limited age control) to test if entrenchment events are coincident with climatic changes. Channel incision along one of the traces in Lorca-Totana segment may be related to transitions from glacial to interglacial periods.",
keywords = "Alhama de Murcia fault, High-resolution DEM, Offset scoring, Strike-slip fault",
author = "Marta Ferrater and Ramon Arrowsmith and Eul{\`a}lia Masana",
year = "2015",
doi = "10.3390/rs71114827",
language = "English (US)",
volume = "7",
pages = "14827--14852",
journal = "Remote Sensing",
issn = "2072-4292",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "11",

}

TY - JOUR

T1 - Lateral offset quality rating along low slip rate faults

T2 - Application to the Alhama de Murcia Fault (SE Iberian Peninsula)

AU - Ferrater, Marta

AU - Arrowsmith, Ramon

AU - Masana, Eulàlia

PY - 2015

Y1 - 2015

N2 - Seismic hazard assessment of strike-slip faults is based partly on the identification and mapping of landforms laterally offset due to fault activity. The characterization of these features affected by slow-moving faults is challenging relative to studies emphasizing rapidly slipping faults. We propose a methodology for scoring fault offsets based on subjective and objective qualities. We apply this methodology to the Alhama de Murcia fault (SE Iberian Peninsula) where we identify 138 offset features that we mapped on a high-resolution (0.5 × 0.5 m pixel size) Digital Elevation Model (DEM). The amount of offset, the uncertainty of the measurement, the subjective and objective qualities, and the parameters that affect objective quality are independent variables, suggesting that our methodological scoring approach is good. Based on the offset measurements and qualifications we calculate the Cumulative Offset Probability Density (COPD) for the entire fault and for each fault segment. The COPD for the segments differ from each other. Tentative interpretation of the COPDs implies that the slip rate varies from one segment to the other (we assume that channels with the same amount of offset were incised synchronously). We compare the COPD with climate proxy curves (aligning using the very limited age control) to test if entrenchment events are coincident with climatic changes. Channel incision along one of the traces in Lorca-Totana segment may be related to transitions from glacial to interglacial periods.

AB - Seismic hazard assessment of strike-slip faults is based partly on the identification and mapping of landforms laterally offset due to fault activity. The characterization of these features affected by slow-moving faults is challenging relative to studies emphasizing rapidly slipping faults. We propose a methodology for scoring fault offsets based on subjective and objective qualities. We apply this methodology to the Alhama de Murcia fault (SE Iberian Peninsula) where we identify 138 offset features that we mapped on a high-resolution (0.5 × 0.5 m pixel size) Digital Elevation Model (DEM). The amount of offset, the uncertainty of the measurement, the subjective and objective qualities, and the parameters that affect objective quality are independent variables, suggesting that our methodological scoring approach is good. Based on the offset measurements and qualifications we calculate the Cumulative Offset Probability Density (COPD) for the entire fault and for each fault segment. The COPD for the segments differ from each other. Tentative interpretation of the COPDs implies that the slip rate varies from one segment to the other (we assume that channels with the same amount of offset were incised synchronously). We compare the COPD with climate proxy curves (aligning using the very limited age control) to test if entrenchment events are coincident with climatic changes. Channel incision along one of the traces in Lorca-Totana segment may be related to transitions from glacial to interglacial periods.

KW - Alhama de Murcia fault

KW - High-resolution DEM

KW - Offset scoring

KW - Strike-slip fault

UR - http://www.scopus.com/inward/record.url?scp=84950105602&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84950105602&partnerID=8YFLogxK

U2 - 10.3390/rs71114827

DO - 10.3390/rs71114827

M3 - Article

AN - SCOPUS:84950105602

VL - 7

SP - 14827

EP - 14852

JO - Remote Sensing

JF - Remote Sensing

SN - 2072-4292

IS - 11

ER -