Publikationsdatum:
2012-02-03
Beschreibung:
Application of light detection and ranging (LIDAR) technology in volcanology has
7 developed rapidly over the past few years, being extremely useful for the generation
8 of high‐spatial‐resolution digital elevation models and for mapping eruption products.
9 However, LIDAR can also be used to yield detailed information about the dynamics of
10 lava movement, emplacement processes occuring across an active lava flow field, and the
11 volumes involved. Here we present the results of a multitemporal airborne LIDAR survey
12 flown to acquire data for an active flow field separated by time intervals ranging from
13 15 min to 25 h. Overflights were carried out over 2 d during the 2006 eruption of Mt. Etna,
14 Italy, coincident with lava emission from three ephemeral vent zones to feed lava flow in
15 six channels. In total 53 LIDAR images were collected, allowing us to track the volumetric
16 evolution of the entire flow field with temporal resolutions as low as ∼15 min and at a
17 spatial resolution of 〈1 m. This, together with accurate correction for systematic errors,
18 finely tuned DEM‐to‐DEM coregistration and an accurate residual error assessment,
19 permitted the quantification of the volumetric changes occuring across the flow field. We
20 record a characteristic flow emplacement mode, whereby flow front advance and channel
21 construction is fed by a series of volume pulses from the master vent. Volume pulses
22 have a characteristic morphology represented by a wave that moves down the channel
23 modifying existing channel‐levee constructs across the proximal‐medial zone and building
24 new ones in the distal zone. Our high‐resolution multitemporal LIDAR‐derived DEMs
25 allow calculation of the time‐averaged discharge rates associated with such a pulsed flow
26 emplacement regime, with errors under 1% for daily averaged values.
Beschreibung:
This work was partially funded by the Italian 930
Dipartimento della Protezione Civile in the frame of the 2007–2009 Agree- 931
ment with Istituto Nazionale di Geofisica e Vulcanologia–INGV. A.F. 932
benefited from the MIUR‐FIRB project “Piattaforma di ricerca multi‐disci- 933
plinare su terremoti e vulcani (AIRPLANE)” n. RBPR05B2ZJ. S.T. 934
benefited from the project FIRB “Sviluppo di nuove tecnologie per la prote- 935
zione e difesa del territorio dai rischi naturali (FUMO)” funded by the Italian 936
Ministero dell’Istruzione, dell’Università e della Ricerca.
Beschreibung:
Published
Beschreibung:
B11203
Beschreibung:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Beschreibung:
1.10. TTC - Telerilevamento
Beschreibung:
3.6. Fisica del vulcanismo
Beschreibung:
JCR Journal
Beschreibung:
reserved
Schlagwort(e):
LIDAR
;
lava flow
;
Etna
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
article
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