Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/989
AuthorsMartínez-Díaz, J. J.* 
Masana, E.* 
Hernández-Enrile, J. L.* 
Santanach, P.* 
TitleEffects of repeated paleoearthquakes on the Alhama de Murcia Fault (Betic Cordillera, Spain) on the Quaternary evolution of an alluvial fan system
Issue Date2003
Series/Report no.46 (5)
URIhttp://hdl.handle.net/2122/989
Keywordspaleoseismicity
slow active faults
fan morphology
Alhama de Murcia Fault
BeticCordillera
Subject Classification04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology 
04. Solid Earth::04.04. Geology::04.04.03. Geomorphology 
AbstractIn this work we present a study of an alluvial fan system, which is affected by the Quaternary activity of the leftlateral, reverse Alhama de Murcia Fault (Betic Cordillera). Paleoseismic studies in this area yield data that can be compared and correlated with the morphologic and tectono-sedimentary evolution of the alluvial fan. The spatial arrangement of the sedimentary alluvial fan units near the fault zone, shown in trenches, is controlled by the recurrent reverse, left-lateral coseismic events. We analysed the morphology of the drainage network using a 1:5000 scale orthoimage to identify and measure horizontal deflections along the fault. The channel pattern analysis allowed us to estimate the average horizontal slip rate of the SAMF for the last 130 ka. This value is 0.21 mm/a, which is slightly higher than the range of values obtained by trenching analysis for the last 30 ka, (0.06 to 0.15 mm/yr). The interpretation of the stratigraphic sequence exposed along the trench walls constrained the occurrence of at least two surface faulting earthquakes during the last 30000 years. The most recent event happened after the El Saltador Creek dissected the alluvial fan. The penultimate event occurred while the alluvial fan was still active.
Appears in Collections:Annals of Geophysics

Files in This Item:
File Description SizeFormat 
0775_792Martinez.pdf1.84 MBAdobe PDFView/Open
Show full item record

Page view(s)

582
Last Week
0
Last month
4
checked on Jul 24, 2017

Download(s)

217
checked on Jul 24, 2017

Google ScholarTM

Check