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Authors: Avallone, A.* 
Marzario, M.* 
Cirella, A.* 
Piatanesi, A.* 
Rovelli, A.* 
Di Alessandro, C.* 
D'Anastasio, E.* 
D'Agostino, N.* 
Giuliani, R.* 
Mattone, M.* 
Title: Very high rate (10 Hz) GPS seismology for moderate-magnitude earthquakes: The case of theMw6.3 L'Aquila (central Italy) event
Journal: Journal of Geophysical Research 
Series/Report no.: /116 (2011)
Issue Date: 2011
DOI: 10.1029/2010JB007834
Keywords: 10 Hz GPS seismology
Subject Classification04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
Abstract: The 2009 April 6th Mw 6.3 L'Aquila destructive earthquake was successfully recorded by closely 23 spaced 10-Hz and 1-Hz recording GPS receivers and strong motion accelerometers located above or 24 close to the 50° dipping activated fault. We retrieved both static and dynamic displacements from 25 Very High-Rate GPS (VHRGPS) recordings by using Precise Point Positioning kinematic analysis. 26 We compared the GPS positions time series with the closest displacement time series obtained by 27 doubly-integrating strong motion data, first, to assess the GPS capability to detect the first seismic 28 arrivals (P waves) and, secondly, to evaluate the accelerometers capability to detect co-seismic 29 offsets up to ~45 s after the earthquake occurrence. By comparing seismic and VHRGPS frequency 30 contents, we inferred that GPS sampling rates greater than 2.5 Hz (i.e. 5 or 10 Hz) are required in 31 the near-field of moderate magnitude events to provide “alias-free” solutions of coseismic dynamic 32 displacements. Finally, we assessed the consistency of the dynamic VHRGPS results as a constraint 33 on the kinematic rupture history of the mainshock. These results suggested that the high-rate 34 sampling GPS sites in the near field can be as useful as strong motion station for earthquake source 35 studies.
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