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Aseismic deformation associated with an earthquake swarm in the northern Apennines (Italy)

Gualandi, A. and Nichele, C. and Serpelloni, E. and Chiaraluce, L. and Anderlini, L. and Latorre, D. and Belardinelli, M. E. and Avouac, J.-P. (2017) Aseismic deformation associated with an earthquake swarm in the northern Apennines (Italy). Geophysical Research Letters, 44 (15). pp. 7706-7714. ISSN 0094-8276. doi:10.1002/2017GL073687.

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Analyzing the displacement time series from continuous GPS (cGPS) with an Independent Component Analysis, we detect a transient deformation signal that correlates both in space and time with a seismic swarm activity (maximum M_w=3.69 ± 0.09) occurred in the hanging wall of the Altotiberina normal fault (Northern Apennines, Italy) in 2013–2014. The geodetic transient lasted ∼6 months and produced a NW-SE trending extension of ∼5.3 mm, consistent with the regional tectonic regime. The seismicity and the geodetic signal are consistent with slip on two splay faults in the Altotiberina fault (ATF) hanging wall. Comparing the seismic moment associated with the geodetic transient and the seismic events, we observe that seismicity accounts for only a fraction of the measured geodetic deformation. The combined seismic and aseismic slip decreased the Coulomb stress on the locked shallow portion of the ATF, while the transition region to the creeping section has been loaded.

Item Type:Article
Related URLs:
URLURL TypeDescription
Gualandi, A.0000-0002-3100-8932
Serpelloni, E.0000-0003-1822-403X
Chiaraluce, L.0000-0002-9697-6504
Anderlini, L.0000-0002-9461-3320
Latorre, D.0000-0002-4594-0317
Belardinelli, M. E.0000-0002-7653-5090
Avouac, J.-P.0000-0002-3060-8442
Additional Information:© 2017 American Geophysical Union. Received 31 MAR 2017; Accepted 11 JUL 2017; Accepted article online 17 JUL 2017; Published online 5 AUG 2017. Some Figures have been created with the Generic Mapping Tool [Wessel et al., 2013]. The declustering has been performed using the Matlab software ZMAP [Wiemer, 2001]. We thank Raffaele Di Stefano for his valuable contribution in the seismic catalog generation. A.G. received financial support through the National Science Foundation (NSF) Geophysical Proposal ID 145136. This work has been developed also in the framework of the project TRANSIENTI, founded by the Italian Ministry of Education, Universities and Research (MIUR)-Premiale 2014. We are grateful to all public and private institutions that made the continuous GPS data used in this work available (;;; GPS time series are available as supporting information. We thank TABOO Near Fault Observatory site managers for data care and availability. The seismic catalog can be obtained by contacting L.C. (
Group:Seismological Laboratory
Funding AgencyGrant Number
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
Subject Keywords:Aseismic deformation; Independent Component Analysis (ICA); GPS; Seismic swarm; Altotiberina fault (ATF)
Issue or Number:15
Record Number:CaltechAUTHORS:20170831-144217593
Persistent URL:
Official Citation:Gualandi, A., C. Nichele, E. Serpelloni, L. Chiaraluce, L. Anderlini, D. Latorre, M. E. Belardinelli, and J.-P. Avouac (2017), Aseismic deformation associated with an earthquake swarm in the northern Apennines (Italy), Geophys. Res. Lett., 44, 7706–7714, doi:10.1002/2017GL073687
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81040
Deposited By: Tony Diaz
Deposited On:31 Aug 2017 22:17
Last Modified:15 Nov 2021 19:40

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