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Estimating Rupture Directions from Local Earthquake Data Using the IPOC Observatory in Northern Chile

Folesky, J., Kummerow, J., Asch, G., Schurr, B., Sippl, C., Tilmann, F., Shapiro, S. A. (2018): Estimating Rupture Directions from Local Earthquake Data Using the IPOC Observatory in Northern Chile. - Seismological Research Letters, 89, 2A, pp. 495—502.
DOI: http://doi.org/10.1785/0220170202



http://gfzpublic.gfz-potsdam.de/pubman/item/escidoc:3015889
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Authors

Folesky ,  J.

Kummerow ,  J.

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/asch

Asch ,  Günter
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/schurr

Schurr ,  B.
4.1 Lithosphere Dynamics, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/sippl

Sippl ,  Christian
4.1 Lithosphere Dynamics, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/tilmann

Tilmann ,  F.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Shapiro ,  S. A.

Abstract
Local seismic broadband recordings of the Integrated Plate boundary Observatory Chile (IPOC) are used to determine rupture directions for 60 M ≥ 5:0 events in the foreshock and aftershock series of the 2014 Mw 8.1 Iquique earthquake in northern Chile. The applied method is based on accurate measurements of the P-wave coda polarization, which exhibits systematic, azimuth-dependent variations with time as the earthquake rupture propagates. We demonstrate a general consistency with observations from teleseismic backprojection studies for the main event and its largest foreshock (Mw 6.7) and aftershock (Mw 7.6). A large portion of the here analyzed events show unilateral rupture behavior, with a predominance of down-dip (east) oriented directivity. This study documents the potential of retrieving rupture directions for M ∼ 5 earthquakes from a high-quality local seismic monitoring system.