MARISCOS (2011 - 2014): GFZ

MARISCOS Project 3: Imaging of rupture surface (Project at FU Berlin)

Station distribution. The aftershock network (Internation Maule Aftershock Deployment - IMAD) was fully installed at the beginning of April 2010 and operated for ~6 months to a year (Figure from Lange et al. (2012), supplementary material)

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).

MAule eaRthquake: Integration of Seismic Cycle Observations and Structural investigations (MARISCOS) Project 3: Imaging of small-scale structures and time-dependent changes in the rupture area of the 2010 Maule earthquake

Time frame: 2011 - 2014

Summary
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 (FU-Berlin, GFZ)
Mauro Palo

Collaborations:
Co-PI's in DFG bundle projects:
Ernst Flüh (Geomar)
Ingo Grevemeyer (Geomar)
Christian Haberland (GFZ)
Frank Krüger (Uni Potsdam)
Dietrich Lange (Uni Potsdam)
Marcos Moreno (GFZ)
Onno Oncken (GFZ)
Bernd Schurr (GFZ)
Manfred Strecker (Uni Potsdam)

Other partners:
Sergio Barrientos (Universidad de Santiago)
Sebastian Hainzl (GFZ)
Oliver Heidbach (GFZ)
Steve Miller (Uni Bonn)

Publications

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, 317-318, 413-425.

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