Project 3:

Imaging of small-scale structures and time-depchanges in the rupture area of the 2010 Maule earthquake

In this project we will apply targeted seismological techniques to image the plate interface, i.e., the subduction channel and its immediate surroundings. Using local seismic network recordings of the aftershock sequence of the Mw=8.8 Maule earthquake of 2010, we will map seismic discontinuities using migration and waveform modelling of reflected or converted waves in order to find evidence of small scale variations in the geometry and properties of the plate interface and oceanic and continental crust. We will also apply an event cluster based method that allows determining Vp/Vs/, which is particularly diagnostic to the presence of fluids, practically in situ and, provided the expected abundance of clustered seismicity, also with high temporal resolution. In particular we would like to know in how far transient, possibly fluid driven processes control the immediate and longer-term post-seismic evolution and if variations in the topography of the plate interface or the elastic properties of the subduction channel can be correlated with variations in pre-seismic locking and co-seismic and post-seismic slip pattern.

Contact: Frederik Tilmann, E-Mail: tilmann (at) gfz-potsdam.de

Figure 1: Vertical component waveforms for cluster of highly similar waveforms consisting of 8 events. In spite of the great similarity between events, the waveforms are differ in some finer details (e.g. red circles).

Aktuelles

Neueste Veröffentlichung:

Lange, D., Tilmann, F., Barrientos, S. E., Contreras-Reyes, E., Methe, P., Moreno, M., Heit, B., Agurto, H., Bernard, P., Vilotte, J.-P., Beck, S. (2012):

Aftershock Seismicity of the 27 February 2010 Mw 8.8 Maule Earthquake Rupture Zone,

Earth and Planetary Science Letters, 317-318C, pp. 413-425, doi:10.1016/j.epsl.2011.11.034.

Moreno, M., Rosenau, M., Oncken, O.:
2010 Maule earthquake slip correlates with pre-seismic locking of Andean subduction zone

Nature, Vol 467, issue 7312, pp 198-202; DOI: 10.1038/nature09349