Publication Date:
2023-09-13
Description:
The 2021 eruption at Tajogaite (Cumbre Vieja) volcano (La Palma, Spain)
was characterized by Strombolian eruptions, Hawaiian fountaining, white gasdominated and grey ash-rich plumes, and lava effusion from multiple vents.
The variety of eruptive styles displayed simultaneously and throughout the
eruption presents an opportunity to explore controls on explosivity and the
relationship between explosive and effusive activity. Explosive eruption dynamics
were recorded using ground-based thermal photography and videography. We
show results from the analysis of short (〈5 min) near-daily thermal videos taken
throughout the eruption from multiple ground-based locations and continuous
time-lapse thermal photos over the period November 16 to November 26. We
measure the apparent radius, velocity, and volume flux of the high-temperature
gas-and-ash jet and lava fountaining behaviors to investigate the evolution of the
explosive activity over multiple time scales (seconds-minutes, hours, and daysweeks). We find fluctuations in volume flux of explosive material that correlate
with changes in volcanic tremor and hours-long increases in explosive flux that
are immediately preceded by increases in lava effusion rate. Correlated behavior
at multiple vents suggests dynamic magma ascent pathways connected in the
shallow (tens to hundreds of meters) sub-surface. We interpret the changes in
explosivity and the relative amounts of effusive and explosivity to be the result of
changes in gas flux and the degree of gas coupling.
Description:
Authors from INVOLCAN and ITER acknowledge
support under projects VOLRISKMAC (MAC/3.5b/124) and
VOLRISKMAC II (MAC2/3.5b/328), financed by the Program
INTERREG V-A Spain-Portugal MAC 2014–2020 of the European
Commission; Cumbre Vieja Emergencia, financed by the Science
and Innovation Ministry, Spanish Government; TFassistance,
financed by the Cabildo Insular de Tenerife; and LPvolcano, financed
by the Cabildo Insular de La Palma. We are grateful to Antoni
Álvarez for his logistical support. Authors from LDEO acknowledge
support from the Gordon and Betty Moore Foundation under
grant GBMF8995 for the AVERT project, and from NSF under
EAR-1654588.
Description:
Published
Description:
1193436
Description:
5V. Processi eruttivi e post-eruttivi
Description:
JCR Journal
Keywords:
Explosive activity
;
Strombolian explosions
;
lava fountains
;
Thermal imagering
;
Cumbre Vieja
;
La Palma,
;
04.08. Volcanology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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