@misc{10481/90964,
year = {2024},
month = {1},
url = {https://hdl.handle.net/10481/90964},
abstract = {El Hierro island is one of the most active islands in the Canary Islands from a
volcanological point of view. This is the reason why the imaging of the internal
crustal structure is of huge importance. The geophysical exploration methods
employed on El Hierro Island, such as gravimetry and seismic tomography,
allowed obtaining the high-resolution characterization of the crust’s deep
part. However, these methods did not yield significant information about the
surface and the shallower part of the crust. To gain a deeper insight into
the shallow geological structure of El Hierro island, we employed Ambient
Noise Tomography to construct a 3D S-wave velocity model. Our investigation
revealed the presence of seven significant seismic velocity anomalies, partly
identified by previous studies. We identified two high-velocity anomalies located
in the eastern and western parts of the island at a depth between 0 and
3 km below sea level (b.s.l.). We interpreted these anomalies as dense intrusive
complexes of dikes, possibly linked to the Tanganasoga volcano and the
formation of the Tiñor edifice. Additionally, we observed two high-velocity
anomalies in the northern and southern parts of the island at a depth between 3
and 4 km b.s.l., which we related to the accumulation of solidified igneous rocks.
On the other hand, a low-velocity anomaly was observed in the Golfo valley,
between 0 and 0.5 km b.s.l., and we interpreted it as megalandslide deposits. This
anomaly was evidenced for the first time in the present study. Finally, two lowvelocity
anomalies were observed in the southern part of the island at different
depths, between 0–0.5 km b.s.l. and 0–2 km b.s.l. These were interpreted as
fractures generated by Quaternary volcanism along the SSE Rift. Also, one of
them was evidenced for the first time in this study, corresponding to the zone of
the fractures produced during the Quaternary volcanism. This study has allowed
us to gain a more detailed understanding of the shallow geological structure of
the island. Even if most of the anomalies had been evidenced previously, we
could observe the existence of two low-velocity zones in the shallow crust that
have not been observed before.},
organization = {Project
VOLRISKMAC II (MAC2/3.5b/328)},
organization = {Cabildo
Insular de Tenerife (TFassistance)},
publisher = {Frontiers Media},
keywords = {Ambient noise tomography},
keywords = {El Hierro island},
keywords = {Intrusive bodies},
title = {Ambient noise tomography of El Hierro island (Canary Islands)},
doi = {10.3389/feart.2023.1326634},
author = {Cabrera Pérez, Iván and Soubestre, Jean and D’Auria, Luca and Przeor, Monika and García, Rubén and Barrancos, José and Padilla, Germán D. and Pérez, Nemesio M. and Prudencio Soñora, Janire},
}