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Imaging thecomplexity of anactive normal faultsystem: The 1997Colfiorito (centralItaly) case study L. ChiaraluceWilliam L. EllsworthC. Chiarabba2003 год

Imaging the complexity of an active normal fault system: The 1997 Colfiorito (central Italy) case study
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Аннотация: Six moderate magnitude earthquakes (5 < M w < 6) ruptured normal fault segments of the southern sector of the North Apennine belt (central Italy) in the 1997 Colfiorito earthquake sequence. We study the progressive activation of adjacent and nearby parallel faults of this complex normal fault system using ∼1650 earthquake locations obtained by applying a double‐difference location method, using travel time picks and waveform cross‐correlation measurements. The lateral extent of the fault segments range from 5 to 10 km and make up a broad, ∼45 km long, NW trending fault system. The geometry of each segment is quite simple and consists of planar faults gently dipping toward SW with an average dip of 40°–45°. The fault planes are not listric but maintain a constant dip through the entire seismogenic volume, down to 8 km depth. We observe the activation of faults on the hanging wall and the absence of seismicity in the footwall of the structure. The observed fault segmentation appears to be due to the lateral heterogeneity of the upper crust: preexisting thrusts inherited from Neogene's compressional tectonic intersect the active normal faults and control their maximum length. The stress tensor obtained by inverting the six main shock focal mechanisms of the sequence is in agreement with the tectonic stress active in the inner chain of the Apennine, revealing a clear NE trending extension direction. Aftershock focal mechanisms show a consistent extensional kinematics, 70% of which are mechanically consistent with the main shock stress field.
Год издания: 2003
Авторы: L. Chiaraluce, William L. Ellsworth, C. Chiarabba, M. Cocco
Издательство: American Geophysical Union
Источник: Journal of Geophysical Research Atmospheres
Ключевые слова: earthquake and tectonic studies, Seismic Imaging and Inversion Techniques, Seismic Waves and Analysis
Другие ссылки: Journal of Geophysical Research Atmospheres (HTML)
Digital Commons - University of Nebraska Lincoln (University of Nebraska–Lincoln) (HTML)
Digital Commons - University of Nebraska Lincoln (University of Nebraska–Lincoln) (PDF)
Digital Commons - University of Nebraska Lincoln (University of Nebraska–Lincoln) (HTML)