Skip to content

Research at St Andrews

Paleoseismology of the Mejillones Fault, northern Chile: Insights from cosmogenic 10Be and optically stimulated luminescence determinations

Research output: Contribution to journalArticle

DOI

Author(s)

J. Cortes, Gabriel Gonzalez, S. A. Binnie, R. Robinson, S. P. H. T. Freeman, G. Vargas

School/Research organisations

Abstract

We have undertaken the first paleoseismological study on an upper plate fault in Chile. The selected structure was the Mejillones Fault, which is marked by a conspicuous fault-scarp. Using cosmogenic 10Be and OSL dating and detailed sedimentary logging of trenches, we have constrained the abandonment of two alluvial surfaces by fault activity at ca. 35 ka and ca. 14 ka. Based on stratigraphic observation we characterized the fault evolution in four intervals over the last ca. 35 ka. During the first three intervals the fault had a steady slip rate of 0.61 +/- 0.26 m/ka. The fourth interval is delineated by the last vertical fault slip and the accumulation of un-deformed hillslope deposits after ca. 3.3 ka and has a slip rate of 0.22 +/- 0.06 m/ka. The younger surface abandonment was caused by two Mw similar to 7 paleoearthquakes with a recurrence interval of 5.0 +/- 3.5 ka. The third interval is characterized by the interaction of hillslope deposits and aseismic slip and/or centimeter scale seismic slip events. At ca. 3.5 ka, a last large (Mw similar to 6.6) earthquake took place. The recurrence intervals of large (Mw > 8.5) subduction earthquakes do not appear to be the same as the recurrence intervals of the Mw similar to 7 events on the upper plate Mejillones Fault.

Close

Details

Original languageEnglish
Article numberTC2017
Number of pages21
JournalTectonics
Volume31
DOIs
Publication statusPublished - 26 Apr 2012

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Evolution of the Mozambique Belt in Malawi constrained by granitoid U-Pb, Sm-Nd and Lu-Hf isotopic data

    Manda, B. W. C., Cawood, P. A., Spencer, C. J., Prave, T., Robinson, R. & Roberts, N. M. W., 29 Nov 2018, In : Gondwana Research. In press

    Research output: Contribution to journalArticle

  2. Rapid and punctuated Late Holocene recession of Siling Co, central Tibet

    Shi, X., Kirby, E., Furlong, K. P., Meng, K., Robinson, R., Lu, H. & Wang, E., 15 Sep 2017, In : Quaternary Science Reviews. 172, p. 15-31 17 p.

    Research output: Contribution to journalArticle

  3. Landscape response to late Pleistocene climate change in NW Argentina: sediment flux modulated by basin geometry and connectivity

    Schildgen, T. F., Robinson, R. A. J., Savi, S., Phillips, W. M., Spencer, J. Q. G., Bookhagen, B., Scherler, D., Tofelde, S., Alonso, R. N., Kubik, P. W., Binnie, S. A. & Strecker, M. R., Feb 2016, In : Journal of Geophysical Research - Earth Surface. 121, 2, p. 392-414 23 p.

    Research output: Contribution to journalArticle

  4. Fluvio-deltaic avulsions during relative sea-level fall

    Nijhuis, A. G., Edmonds, D. A., Caldwell, R. L., Cederberg, J. A., Slingerland, R. L., Best, J. L., Parsons, D. R. & Robinson, R. A. J., Aug 2015, In : Geology. 43, 8, p. 719-722 4 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Cyclic formation and stabilization of Archean lithosphere by accretionary orogenesis: constraints from TTG and potassic granitoids, North China Craton

    Wang, W., Cawood, P. A., Liu, S., Guo, R., Bai, X. & Wang, K., Sep 2017, In : Tectonics. 36, 9, p. 1724-1742

    Research output: Contribution to journalArticle

  2. Early Paleozoic and Early Mesozoic intraplate tectonic and magmatic events in the Cathaysia Block, South China

    Shu, L., Wang, B., Cawood, P. A., Santosh, M. & Xu, Z., 8 Aug 2015, In : Tectonics. 34, 8, p. 1600-1621 22 p.

    Research output: Contribution to journalArticle

  3. Late paleozoic to early mesozoic provenance record of paleo-pacific subduction beneath South China

    Hu, L., Cawood, P. A., Du, Y., Yang, J. & Jiao, L., May 2015, In : Tectonics. 34, 5, p. 986-1008 23 p.

    Research output: Contribution to journalArticle

  4. Contrasting rift and subduction-related plagiogranites in the Jinshajiang ophiolitic melange, southwest China, and implications for the Paleo-Tethys

    Zi, J-W., Cawood, P. A., Fan, W-M., Wang, Y-J. & Tohver, E., 12 Apr 2012, In : Tectonics. 31, p. - 18 p., TC2012.

    Research output: Contribution to journalArticle

ID: 23056025