GPS time series at Campi Flegrei caldera (2000-2013)

Francesco Obrizzo Francesco Obrizzo,Umberto Tammaro Umberto Tammaro,Prospero De Martino Prospero De Martino

doi:10.4401/ag-6431

Francesco Obrizzo Francesco Obrizzo, Umberto Tammaro Umberto Tammaro + Show 1 more

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https://doi.org/10.4401/ag-6431

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Abstract

<p>The Campi Flegrei caldera is an active volcanic system associated to a high volcanic risk, and represents a well known and peculiar example of ground deformations (bradyseism), characterized by intense uplift periods, followed by subsidence phases with some episodic superimposed mini-uplifts. Ground deformation is an important volcanic precursor, and, its continuous monitoring, is one of the main tool for short time forecast of eruptive activity. This paper provides an overview of the continuous GPS monitoring of the Campi Flegrei caldera from January 2000 to July 2013, including network operations, data recording and processing, and data products. In this period the GPS time series allowed continuous and accurate tracking of ground deformation of the area. Seven main uplift episodes were detected, and during each uplift period, the recurrent horizontal displacement pattern, radial from the “caldera center”, suggests no significant change in deformation source geometry and location occurs. The complete archive of GPS time series at Campi Flegrei area is reported in the Supplementary materials. These data can be usefull for the scientific community in improving the research on Campi Flegrei caldera dynamic and hazard assessment.</p>

Highlights

The Campi Flegrei (CF) caldera, which includes the western part of Naples, is an active volcano associated to a high volcanic risk [Ricci et al 2013]
In this paper we have presented the part of the NeVoCGPS network that includes CF caldera
We have described data recording and data processing of the complete dataset of GPS time series at CF caldera from 2000 to July 2013

Summary

Introduction

The Campi Flegrei (CF) caldera, which includes the western part of Naples, is an active volcano associated to a high volcanic risk [Ricci et al 2013]. With this paper we are providing GPS time series of the North, East and Vertical components of 14 stations of the NeVoCGPS network operating at CF area from 2000 to date. An updated set of absolute antenna calibrations (igs08.atx) was adopted [Rebischung et al 2012] These changes have made the previous IGS products inhomogeneous and inconsistent over time, introducing discontinuities into the time series of GPS station positions. In order to get homogeneous results, all the GPS data of the NeVoCGPS network collected before November 2006, have been reprocessed using orbits and ERPs obtained by GPS-PDR reprocessing project of the global reference network based on absolute antenna phase center calibrations [Steigenberger et al 2006]. Residuals demonstrate the consistency of estimated coordinates with IGS08 at level of 3.3 mm in total RMS after the Helmert transformation

GPS time series

Discussion

Conclusion