Uncovering the geodetic signature of silent slip through repeating earthquakes
Por:
Frank W.B., Radiguet M., Rousset B., Shapiro N.M., Husker A.L., Kostoglodov V., Cotte N., Campillo M.
Publicada:
28 abr 2015
Resumen:
Slow transient slip that releases stress along the deep roots of plate interfaces is most often observed on regional GPS networks installed at the surface. The detection of slow slip is not trivial if the dislocation along the fault at depth does not generate a geodetic signal greater than the observational noise level. Instead of the typical workflow of comparing independently gathered seismic and geodetic observations to study slow slip, we use repeating low-frequency earthquakes to reveal a previously unobserved slow slip event. By aligning GPS time series with episodes of low-frequency earthquake activity and stacking, we identify a repeating transient slip event that generates a displacement at the surface that is hidden under noise prior to stacking. Our results suggest that the geodetic investigation of transient slip guided by seismological information is essential in exploring the spectrum of fault slip. ©2015. American Geophysical Union. All Rights Reserved.
Filiaciones:
Frank W.B.:
Équipe de Sismologie, Institut de Physique du Globe de Paris, CNRS, Paris, France
Radiguet M.:
ISTerre, Université Grenoble Alpes, IRD, Grenoble, France
Rousset B.:
ISTerre, Université Grenoble Alpes, IRD, Grenoble, France
Shapiro N.M.:
Équipe de Sismologie, Institut de Physique du Globe de Paris, CNRS, Paris, France
Husker A.L.:
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico
Kostoglodov V.:
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico
Cotte N.:
ISTerre, Université Grenoble Alpes, IRD, Grenoble, France
Campillo M.:
ISTerre, Université Grenoble Alpes, IRD, Grenoble, France
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