Morphosedimentary characteristics and formation mechanisms of new beaches generated after the Tajogaite volcano eruption of 2021 (La Palma, Spain)

Alonso, Ignacio; Santana-Sarmiento, Francisco J.; Andrés-Araujo, Flora; Casamayor, Mariona; Montoya-Montes, Isabel; Brenes, Alex; Herrera, Rogelio; Sánchez-García, María J.

doi:10.1016/j.margeo.2023.107099

Cited by 2 publications

(1 citation statement)

References 44 publications

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“…However, the case of 'a'ā lava ow entry into a lake, sea or ocean has been far less studied. Three of the few such examples are the 1934-1935 Showa Iwo-jima and the 2014 Nishinoshima eruptions in Japan, both forming new islands (Maeno and Taniguchi 2006;Maeno et al 2016), or the more recent 2021 Tajogaite eruption in the Canaries (Alonso et al 2023). The interaction of the lava ow fronts with sea water in both cases resulted in crests and troughs of wrinkles of the ow margins, crease structures and sub-vertical ow banding (Maeno and Taniguchi 2006;Maeno et al 2016) very similar to what we have observed at Stromboli on the San Bartolo lava ow eld.…”

Section: Introductionmentioning

confidence: 99%

When the lava meets the sea: emplacement of the 2-4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

Shajahan,

Harris,

Zanella

et al. 2024

Preprint

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When a lava flow enters a body of water, either a lake, sea, river or ocean, explosive interaction may arise. However, when it is an 'a'ā lava flow entering water, a more complex interaction occurs, that is very poorly described and documented in literature. In this paper we analysed the 2–4 ka San Bartolo lava flow field emplaced on the north flank of Stromboli volcano, Italy. The lava flow field extends from ~ 650 m elevation, where the eruptive fissure emplaced following the main structural trend of the island, to the NE coast through two prominent lava channels at middle elevation. Along the coast the lava flow field expands to form a lava delta ~ 1 km wide characterized by 16 lava ‘Flow’ units. We performed a field survey to characterize the features of lava entering the sea and the associated formation of different components, and magnetic measurements to infer the flow fabrics and emplacement process of the lava flow system. We measured the density, porosity and connectivity of several specimens to analyse the effect of lava-water interaction on the content in vesicles and their connectivity, and conducted a macroscopic componentry analysis (clast count) at selected sites to infer the character of the eroded offshore segment of the lava flow field and its component flow units. The collected data allowed us to define the main components of a lava delta fed by 'a'ā lava flows, with its channels, littoral units, ramps, lava tubes, and inflated pāhoehoe flows controlled by the arterial 'a'ā flow fronts. The spatial organization of these components allowed us to build a 3-steps model for 'a'ā entering a water. The initial stage corresponds to the entry of channel-fed 'a'ā lava flow into the sea which fragments to form metric blocks of 'a'ā lava. Continued lava supply to the foreshore causes flow units to stall while spreading over this substrate. Subsequent 'a'ā lava flow units ramp up behind the stalled flow front barrier. Lava tubes extending through the stalled flow barrier feed the seaward extension of a bench made of several pāhoehoe flow units.

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Section: Introductionmentioning

confidence: 99%

When the lava meets the sea: emplacement of the 2-4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

Shajahan,

Harris,

Zanella

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

When the lava meets the sea: emplacement of the 2–4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

Shajahan,

Harris,

Zanella

et al. 2024

Bull Volcanol

View full text Add to dashboard Cite

When a lava flow enters a body of water, either a lake, sea, river or ocean, explosive interaction may arise. However, when it is an 'a'ā lava flow entering water, a more complex interaction occurs, that is very poorly described and documented in literature. In this paper, we analysed the 2–4 ka San Bartolo lava flow field emplaced on the north flank of Stromboli volcano, Italy. The lava flow field extends from ~ 650 m a.s.l. where the eruptive fissure is located, with two lava channels being apparent on the steep down to the coast. Along the coast the lava flow field expands to form a lava delta ~ 1 km wide characterised by 16 lava ‘Flow’ units. We performed a field survey to characterise the features of lava entering the sea and the associated formation of different components and magnetic measurements to infer the flow fabrics and emplacement process of the lava flow system. We measured the density, porosity and connectivity of several specimens to analyse the effect of lava-water interaction on the content in vesicles and their connectivity and conducted a macroscopic componentry analysis (clast count) at selected sites to infer the character of the eroded offshore segment of the lava flow field and its component flow units. The collected data allowed us to define the main components of a lava delta fed by 'a'ā lava flows, with its channels, littoral units, ramps, lava tubes, and inflated pāhoehoe flows controlled by the arterial 'a'ā flow fronts. The spatial organisation of these components allowed us to build a three-step descriptive model for 'a'ā entering a water. The initial stage corresponds to the entry of channel-fed 'a'ā lava flow into the sea which fragments to form metric blocks of 'a'ā lava. Continued lava supply to the foreshore causes flow units to stall while spreading over this substrate. Subsequent 'a'ā lava flow units ramp up behind the stalled flow front barrier. Lava tubes extending through the stalled flow barrier feed the seaward extension of a bench made of several pāhoehoe flow units.

show abstract

Morphosedimentary characteristics and formation mechanisms of new beaches generated after the Tajogaite volcano eruption of 2021 (La Palma, Spain)

Cited by 2 publications

References 44 publications

When the lava meets the sea: emplacement of the 2-4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

When the lava meets the sea: emplacement of the 2-4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

When the lava meets the sea: emplacement of the 2–4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

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