standard deviation cm/yr per deformation velocity 1 cm per deformation after Casu et al., 2006.

Transkript

1 Comparing GPS and SBAS results IREA, INGV-CT, INGV-NA NA

2 Our reference for precision standard deviation cm/yr per deformation velocity 1 cm per deformation after Casu et al., 2006.

3 Napoli Bay (Italy) test case: ERS ENVISAT Ascending Orbit QUAR SANA LICO PRET ARFE BAIA IPPO RITE OSVE ACAE Campi Flegrei BKE1 AGR1 Mt. Vesuvio TERZ ONPI ccm/year /yea < -1 >1

4 Napoli Bay (Italy) test case Δ: : SAR * : GPS LICO ARFE QUAR IPPO OSVE SANA BKE1 PRET BAIA RITE ACAE AGR1 TERZ ONPI σ = 0.45 cm

5 Napoli Bay (Italy) test case σ = 1.0 cm Non filtrato σ = 0.45 cm Filtrato

6 Napoli Bay (Italy) test case Ascending Descending GPS Filt Unfilt Filt Unfilt ACAE AGR ARFE BAIA IPPO (cm) LICO ONPI OSVE PRET QUAR Standard Deviation RITE SANA mean

7 Napoli Bay (Italy) test case Descending up to 2010 LICO ARFE QUAR IPPO OSVE SANA BKE1 PRET BAIA RITE ACAE AGR1 TERZ ONPI

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14 Ascending Descending GPS Filt Unfilt Filt Unfilt Descending ACAE ACAE 1.15 AGR AGR ARFE ARFE 0.48 BAIA BAIA IPPO IPPO 0.91 LICO LICO 0.71 ONPI ONPI 0.54 OSVE OSVE 0.74 PRET PRET 0.64 QUAR QUAR 0.56 RITE RITE 0.48 SANA SANA 0.75 mean mean

15 GPS <2008 <2010 ACAE AGR ARFE BAIA IPPO LICO ONPI OSVE PRET QUAR RITE SANA mean

16 Mt. Etna (Italy) test case: : ERS - ENVISAT Descending < -2 cm/year > 2 Ascending < -2 cm/year > 2

17 Mt. Etna (Italy) test case RPN PER EMFN EMAL LAM STP EFAR MIL GIA EMEG NUN PDG EMGL CAP ETDF ENIC ESLN

18 Mt. Etna (Italy) test case σ = 1.0 cm Descending Filtered σ = 1.3 cm Descending Unfiltered EMEG

19 Mt. Etna (Italy) test case Ascending Filtered σ = 1.0 cm Ascending Unfiltered σ = 1.35 cm EMEG

20 Mt. Etna (Italy) test case Standard Deviation (cm) Ascending GPS Filt Unfilt EFAR EMAL EMEG EMFN EMGL ENIC ESLN CAP GIA LAM NUN PDG RPN SLN STP

21 Mt. Etna (Italy) test case RPN5

22 Mt. Etna (Italy) test case

23 Reference

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26 GPS name SAR GPS scarto [cm] [cm] [cm] EMAL EMEG EMFN EMGL ENIC N/A N/A EPND N/A N/A ESLN

27 Conclusions and further developments An extensive comparison of SBAS and GPS deformation measurements has been carried out on several volcanic sites. In general, the SBAS time series accuracy is less than 1cm, in accordance with previous studies. Moreover, the atmospheric artifacts accounts for no more that 5mm. Larger errors are associated with large (with respect to the wavelength) and fast (with respect to the revisit time, i. e., temporal sampling) deformation signals at the same time. This is basically due to Phase Unwrapping errors, caused by an undersampling of the deformation signal in time. Possible solutions to this problem are: Reduce the satellite revisit time; Improve existing phase unwrapping algorithms.

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