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Titel Seismic-reflection imaging of the crust using earthquake waveform recordings - A case study from the Central Andes
VerfasserIn Cedric Schmelzbach, Jörn Kummerow, Peter Wigger, Anton Reshetnikov, Serge A. Shapiro
Konferenz EGU General Assembly 2013
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 15 (2013)
Datensatznummer 250079476
 
Zusammenfassung
Processing earthquake waveform recordings into seismic-reflection images has the potential to complement and extend controlled-source seismic imaging of the crust. Within the Central Andean forarc system, large fault zones such as the West Fissure Fault System (Precordillera, North Chile, around 21°S 69°W) are responsible for the frequent release of seismic energy within the upper crust. With the motivation to image the structure of the upper crust (< 35 km) of the Chilean Precordillera using reflections contained in passive-seismic waveform recordings, we developed a novel workflow to process passive-seismic data into reflection images. We processed the waveform recordings of several hundred earthquakes using signal processing and imaging techniques adapted from active seismic-reflection surveying. Specifically, we took advantage of the fact that the passive seismic recording geometry with the sources located at depth and the receiver placed at the surface resembles a vertical-seismic profiling (VSP) experiment. Key data processing steps included precise hypocenter parameter estimation, compensation for time-delays due to, for example, location errors and near-surface effects, removal of signal variations due to source radiation patterns, identification and extraction of reflections, and transformation of the processed reflection data into subsurface reflectivity images. A comparison with the active-seismic ANCORP data reveals that similar features were resolved and highlights the potential of our novel approach to obtain crustal-scale images from earthquake waveform data in a resolution comparable to active-seismic experiments.