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AuthorsAvallone, A.* 
Marzario, M.* 
Cirella, A.* 
Piatanesi, A.* 
Rovelli, A.* 
Di Alessandro, C.* 
D'Anastastio, E.* 
D'Agostino, N.* 
Giuliani, R.* 
Mattone, M.* 
Title10 Hz GPS seismology for moderate magnitude earthquakes: the case of the Mw 6.3 L’Aquila (Central Italy) event
Issue Date23-Nov-2010
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations 
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
AbstractThe 2009 April 6th Mw 6.3 L'Aquila destructive earthquake was successfully recorded by closely spaced 10-Hz and 1-Hz recording GPS receivers and strong motion accelerometers located above or close to the 50° dipping activated fault. We retrieved both static and dynamic displacements from Very High-Rate GPS (VHRGPS) recordings by using Precise Point Positioning kinematic analysis. We compared the GPS positions time series with the closest displacement time series obtained by doubly-integrating strong motion data, first, to assess the GPS capability to detect the first seismic arrivals (P waves) and, secondly, to evaluate the accelerometers capability to detect co-seismic offsets up to ~45 s after the earthquake occurrence. By comparing seismic and VHRGPS frequency contents, we inferred that GPS sampling rates greater than 2.5 Hz (i.e. 5 or 10 Hz) are required in the near-field of moderate magnitude events to provide “alias-free” solutions of coseismic dynamic displacements. Finally, we assessed the consistency of the dynamic VHRGPS results as a constraint on the kinematic rupture history of the mainshock. These results suggested that the high-rate sampling GPS sites in the near field can be as useful as strong motion station for earthquake source studies.
DescriptionAccepted for publication in (Journal of Geophysical Research). Copyright (2010) American Geophysical Union.
Appears in Collections:Papers Published / Papers in press

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