Publication Date:
2017-04-04
Description:
The Colli Albani volcanic complex, located in central Italy about 15km SE of Rome, has been dominated by
periodic eruptive histories started about 561 ka and ending with the most recent and voluminous activity
of the Albano maar (〈70 ka) phase. Earthquakes of moderate intensity, gas emissions and significant
ground deformations are the recent evidences of a residual activity. We decided to start a monitoring
test by installing as first step three GPS permanent stations on the volcanic structure, in sites easily
accessible. The analysis of about 2 years of GPS observations has evidenced a peculiar velocity pattern
of the Colli Albani stations with respect to those located nearby, but outside the volcano edifice. With
respect to Eurasia, the horizontal velocities are NE directed with magnitudes of 2.2±1.4mm/year (RDPI),
3.0±0.8mm/year (RMPO) and 3.3±1.2mm/year (NEMI). The uplift rates are determined with minor
accuracy and range from 3.3 and 6.0mm/year. We used a non-linear inversion algorithm to determine
the best-fit parameters for a Mogi spherical source based on the Levenberg–Marquardt least squares
approach. The best-fit is obtained with a source at 4.6km depth beneath thewestern flank of the volcano
and a volume variation of 3.6×10−4 km3/year. This result is in agreement with the volume rate retrieved
by PS-InSAR technique and rather different from the rate inferred from leveling surveys. Consequently,
non-linear trends of the hydrothermal system charge cannot be excluded apriori and the continuous GPS
monitoring should be considered a priority in assessing the hazard of the Colli Albani.
Description:
This work has been partially supported by the Dept. of Civil Protection, Project DPC115 V3 Colli Albani.
Description:
Published
Description:
79-87
Description:
1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
Colli Albani
;
GPS
;
Volcano monitoring
;
Mogi source
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
