Coseismic displacement waveforms for the 2016 August 24 Mw 6.0 Amatrice earthquake (central Italy) carried out from High-Rate GPS data

A Avallone ,Felice Minichiello Felice Minichiello,Roberta Giuliani Roberta Giuliani,Angelo Castagnozzi Angelo Castagnozzi,Vincenzo Cardinale Vincenzo Cardinale,Luigi Abruzzese Luigi Abruzzese,Raffaele Moschillo Raffaele Moschillo,Antonino Memmolo Antonino Memmolo,Piera Gambino Piera Gambino,Luigi Falco Luigi Falco,Franco Migliari Franco Migliari,Enrico Serpelloni Enrico Serpelloni,Diana Latorre Diana Latorre,Giovanni De Luca Giovanni De Luca,Stefano Calcaterra Stefano Calcaterra,Angelo Massucci ,Gianpaolo Cecere ,N D’agostino ,A Cavaliere ,Luigi Zarrili ,A Herrero ,Ciriaco D’ambrosio ,M Mattone ,R Devoti ,G Selvaggi

doi:10.4401/ag-7275

A Avallone , Felice Minichiello Felice Minichiello + Show 23 more

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https://doi.org/10.4401/ag-7275

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Abstract

We used High-Rate sampling Global Positioning System (HRGPS) data from 52 permanent stations to retrieve the coseismic dynamic displacements related to the 2016 August 24 Mw 6.0 Amatrice earthquake. The HRGPS position time series (named hereinafter "GPSgrams") were obtained with two different analysis strategies of the raw GPS measurements (Precise Point Positioning [PPP] and Double-Difference [DD] positioning approaches using the Gipsy-Oasis II and the TRACK (GAMIT/GLOBK) software, respectively). These GPSgrams show RMS accuracies mostly within 0.3 cm and, for each site, an agreement within 0.5 cm between the two solutions. By using cross-correlation technique, the GPSgrams are also compared to the doubly-integrated strong motion data at sites where the different instrumentations are co-located in order to recognize in the GPSgrams the seismic waves movements. The high values (mostly greater than 0.6) of the cross-correlation functions between these differently-generated waveforms (GPSgrams and the SM displacement time-histories) at the co-located sites confirm the ability of GPS in providing reliable waveforms for seismological applications.

Highlights

O n August 24, 2016, at 01:36:32 (UTC time, http://cnt.rm.ingv.it, Marchetti et al., 2016), a Mw 6.0 earthquake struck the region of the Central Apennines (Italy) between the towns of Norcia and Amatrice (Figure 1), where peak ground accelerations values up to recorded
The ground displacements associated to the August, 24 Mw 6.0 main shock were recorded by a number of High-Rate sampling
The observed ground motions in the GPSgrams were consistently associated with the propagation of the seismic waves

Summary

INTRODUCTION

O n August 24, 2016, at 01:36:32 (UTC time, http://cnt.rm.ingv.it, Marchetti et al., 2016), a Mw 6.0 earthquake struck the region of the Central Apennines (Italy) between the towns of Norcia and Amatrice (Figure 1), where peak ground accelerations values up to. The main shock and the largest part of aftershock events show focal solutions (http://cnt.rm.ingv.it/tdmt.html, Scognamiglio et al, 2016; http://www.bo.ingv.it/RCMT). The ground displacements associated to the August, 24 Mw 6.0 main shock were recorded by a number of High-Rate sampling Raw phase data were obtained from the following GNSS networks or agencies: RING (INGV RING Working Group, 2016; http://ring.gm.ingv.it), ISPRA (http://www.isprambiente.gov.it), DPC (http://www.protezionecivile.gov.it), Regione. In this work we will describe the high-rate GPS (HRGPS) time series (named hereinafter "GPSgrams") following the PPP and DD approaches by using two different scientific packages (Gipsy/Oasis and GAMIT/GLOBK), and compare the results. The GPSgrams have been compared with the displacement time histories carried out from the double integration of the SM data at some stations, where the different instruments are approximately co-located (Figure 1)

HRGPS TIME SERIES

COMPARISON BETWEEN HRGPS AND

Findings

CONCLUSIONS