Options
Lava flow identification and aging by means of lidar intensity: Mount Etna case
Author(s)
Language
English
Obiettivo Specifico
3.6. Fisica del vulcanismo
3.5. Geologia e storia dei sistemi vulcanici
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/112 (2007)
Publisher
American Geophysical Union
Pages (printed)
B02201
Issued date
February 13, 2007
Alternative Location
Keywords
Abstract
An application of light detection and ranging (lidar) intensity for the identification and mapping of different lava flows from the Mount Etna (Italy) active volcano is described. In September 2004 an airborne lidar survey was flown over summit sectors of Mount Etna. The information derived from lidar intensity values was used to compare the lava flows with respect to their age of emplacement. Analyzed lava flows vary in age between those dating prior to A.D. 1610 and those active during the survey (2004–2005 eruptions). The target-emitter distance, as well as surface roughness and texture at the lidar footprint scale, is the main parameter controlling the intensity response of lava flows. Variations in the roughness and texture of surfaces at a meter scale result from two main processes, initial lava cooling and subsequent surface weathering; both lead to variations in the original surface roughness of the flow. In summary: (1) initially, from the time of emplacement, the lidar intensity of lava flow surfaces decreases and (2) about 6 years after emplacement the lidar intensity of lava surfaces starts to increase with the age of flows. Lidar capability in terms of geometric (accuracy of ∼1 m in plan position and less than 1 m in elevation) and spectral (lidar intensity depends on surface reflection at λ = 1.064 μm) information can thus be effectively used to map lava flows and to define a relative chronology of lava emplacement.
Type
article
File(s)
No Thumbnail Available
Name
JGR_Mazzarini et al_2007.pdf
Size
1.55 MB
Format
Adobe PDF
Checksum (MD5)
0019909a5f4d20e5d1131e5ab43d2b00