{"ID":1679,"name":"Alban Hills","location":[{"name":"Mediterranean and W. Asia","url":"https:\/\/comet.nerc.ac.uk\/location\/mediterranean-and-w-asia\/","slug":"mediterranean-and-w-asia","id":48,"api_endpoint":"https:\/\/comet.nerc.ac.uk\/wp-json\/volcanodb\/v1\/location\/48"}],"volcano_number":"211004","country":"Italy","geodetic_measurements":"Yes","deformation_observation":"Yes","duration_of_observation":"1950 to present ","characteristics_of_deformation":"
From Anzidei et al., 2010:\u00a0An uplift of ~30 cm over the last 43 years was recently detected by levelling surveys\u00a0performed in the time span 1950-1993 along a levelling line that crosses the highest elevation area\u00a0of the western flank of the volcano.\u00a0The comparison between the 1950-1999 surveys\u00a0show significant\u00a0uplift, whereas the subsequent surveys (1997-1999 and 2002) have not shown\u00a0uplift at a confidence level of 95%. From 2002 to 2006, a\u00a0small uplift is detected along the leveling line and the Albano lake levelling circuit.<\/p>\n
Space-based\u00a0GPS and InSAR\u00a0observations confirm that this uplift is distributed in a wide area around the craters of\u00a0Albano and Nemi, where the most recent volcanic activity occurred. GPS data from continuous\u00a0monitoring stations indicate that both horizontal and vertical deformations do occur and that can be\u00a0addressed to a shallow magmatic source.<\/p>\n
The simplest model able to fit the low number of GPS\u00a0observations (14\u00a0measurements from 6 GPS stations, 4 rejected due to local effects) is a point-pressure source\u00a0at a\u00a0depth of about 4.7 km, on the western flank of the Colli Albani complex.<\/p>\n
A\u00a0SAR dataset used to study the Colli Albani area is composed by ERS1 and ERS2\u00a0images, for a total of 66 SAR descending acquisitions available from June 1992 to December 2000,\u00a0whilst 34 images from April 1993 until November 2000 concern the ascending dataset.\u00a0An uplift zone, mainly located on the west part of the Colli Albani caldera complex is clearly\u00a0evident. A maximum of about 2.5 mm\/yr is measured by the PS close to the villages of Ariccia and\u00a0Albano (Salvi et al. <\/i>2004).<\/p>\n
All data sets are in agreement and\u00a0indicate that this volcano shows active deformation with uplift rates within 6 mm\/year. These are\u00a0mainly located in a well defined area that includes the surroundings of the Albano and Nemi lakes\u00a0and the main villages of Marino, Albano and Ariccia, the area of the most recent volcanic activity.<\/p>\n","latitude":"41.73","longitude":"12.7","images":[],"uri":"https:\/\/comet.nerc.ac.uk\/volcanoes\/alban-hills\/","api_endpoint":"https:\/\/comet.nerc.ac.uk\/wp-json\/volcanodb\/v1\/volcano\/1679","measurement_methods":"InSAR, GPS - continuous, GPS - campaign, Levelling","inferred_causes":"Magmatic","references":["Anzidei, M., F. Rigussi, and S. Stramondo (2010) Current geodetic deformation of the Colli Albani volcano: A review, in The Colli Albani Volcano, Eds., R. Funiciello and G. Giordano, The Geological Society of London.","Salvi, S., Atzori, S., Tolomei, C., Allevi, J., Ferretti, A., Rocca, F., Prati, C., Stramondo,
\nS., Feuillet, N., 2004. Inflation rate of the Colli Albani volcanic complex retrieved by the
\npermanent scatterers SAR interferometry technique. Geophysical Research Letter 31 (12).
\ndoi:10.1029\/2004GL020253.","Smithsonian Institution Global Volcanism Program
\nhttp:\/\/www.volcano.si.edu\/volcano.cfm?vn=211004"],"date_added":"2015-07-19 18:57:02","last_modified":"2015-07-19 18:57:02"}