eprintid: 10094991
rev_number: 14
eprint_status: archive
userid: 608
dir: disk0/10/09/49/91
datestamp: 2020-06-26 06:31:14
lastmod: 2021-10-01 23:44:41
status_changed: 2020-06-26 06:31:14
type: article
metadata_visibility: show
creators_name: Slatcher, N
creators_name: James, MR
creators_name: Calvari, S
creators_name: Ganci, G
creators_name: Browning, J
title: Quantifying Effusion Rates at Active Volcanoes through Integrated Time-Lapse Laser Scanning and Photography
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F57
keywords: lava flow; scoria cone; effusion rate; terrestrial laser scanning; time-lapse
photography; Mt. Etna
note: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
abstract: During volcanic eruptions, measurements of the rate at which magma is erupted
underpin hazard assessments. For eruptions dominated by the effusion of lava, estimates
are often made using satellite data; here, in a case study at Mount Etna (Sicily), we make
the first measurements based on terrestrial laser scanning (TLS), and we also include
explosive products. During the study period (17–21 July 2012), regular Strombolian
explosions were occurring within the Bocca Nuova crater, producing a ~50 m-high scoria
cone and a small lava flow field. TLS surveys over multi-day intervals determined a mean
cone growth rate (effusive and explosive products) of ~0.24 m3·s
−1
. Differences between
0.3-m resolution DEMs acquired at 10-minute intervals captured the evolution of a
breakout lava flow lobe advancing at 0.01–0.03 m3·s
−1
. Partial occlusion within the crater
prevented similar measurement of the main flow, but integrating TLS data with time-lapse
imagery enabled lava viscosity (7.4 × 105 Pa·s) to be derived from surface velocities and,
hence, a flux of 0.11 m3·s
−1 to be calculated. Total dense rock equivalent magma discharge
estimates are ~0.1–0.2 m3·s
−1 over the measurement period and suggest that simultaneous estimates from satellite data are somewhat overestimated. Our results support the use of
integrated TLS and time-lapse photography for ground-truthing space-based measurements
and highlight the value of interactive image analysis when automated approaches, such as
particle image velocimetry (PIV), fail.
date: 2015-11-01
date_type: published
publisher: MDPI
official_url: https://doi.org/10.3390/rs71114967
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1107539
doi: 10.3390/rs71114967
lyricists_name: Browning, John
lyricists_id: JBROW15
actors_name: Browning, John
actors_id: JBROW15
actors_role: owner
full_text_status: public
publication: Remote Sensing
volume: 7
number: 11
pagerange: 14967-14987
pages: 21
issn: 2072-4292
citation:        Slatcher, N;    James, MR;    Calvari, S;    Ganci, G;    Browning, J;      (2015)    Quantifying Effusion Rates at Active Volcanoes through Integrated Time-Lapse Laser Scanning and Photography.                   Remote Sensing , 7  (11)   pp. 14967-14987.    10.3390/rs71114967 <https://doi.org/10.3390/rs71114967>.       Green open access   
 
document_url: https://discovery-pp.ucl.ac.uk/id/eprint/10094991/1/Slatcher-2015-Quantifying-effusion-rates-at-activ.pdf