Refining seismic parameters in low seismicity areas by 3D trenching: TheAlhama de Murcia fault, SE Iberia



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Ferrater, Marta and Ortuño, María and Masana, Eulàlia and Pallàs, Raimon and Perea Manea, Hector and Baize, Stephane and García Meléndez, Eduardo and Martínez Díaz, José J. and Echeverria, Anna and Rockwell, Thomas K. and Sharp, Warren D. and Medialdea, Alicia and Rhodes, Edward J. (2016) Refining seismic parameters in low seismicity areas by 3D trenching: TheAlhama de Murcia fault, SE Iberia. Tectonophysics, 680 . pp. 122-128. ISSN 0040-1951

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hree-dimensional paleoseismology in strike-slip faults with slip rates less than 1 mm per year involves a greatmethodological challenge. We adapted 3D trenching to track buried channels offset by the Alhama de Murciaseismogenic left-lateral strike-slip fault (SE Iberia). A fault net slip of 0.9 ± 0.1 mm/yr was determined usingstatistical analysis of piercing lines for one buried channel, whose age is constrained between 15.2 ± 1.1 kaand 21.9–22.3 cal BP. This value is larger and more accurate than the previously published slip rates for thisfault. The minimum number offive paleo-earthquakes identified since the deposition of dated layers suggestsa maximum average recurrence interval of approximately 5 ka. The combination of both seismic parametersyields a maximum slip per event between 5.3 and 6.3 m. We show that accurately planned trenching strategiesand data processing may be key to obtaining robust paleoseismic parameters in low seismicity ares

Item Type:Article
Uncontrolled Keywords:Paleoseismology ; Strike-slip fault ; Recurrence ; Slip rate Slip per event ; SE Iberian Peninsula
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Seismology
ID Code:58875
Deposited On:11 Feb 2020 19:30
Last Modified:21 Apr 2020 09:55

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