Publication Date:
2020-02-24
Description:
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.
Description:
Published
Description:
B02305
Description:
JCR Journal
Description:
open
Keywords:
10 Hz GPS seismology
;
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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