TY - JOUR

T1 - Local Earthquake Seismic Tomography Reveals the Link Between Crustal Structure and Volcanism in Tenerife (Canary Islands)

AU - Koulakov, Ivan

AU - D'Auria, Luca

AU - Prudencio, Janire

AU - Cabrera-Pérez, Iván

AU - Barrancos, José

AU - Padilla, Germán D.

AU - Abramenkov, Sergei

AU - Pérez, Nemesio M.

AU - Ibáñez, Jesús M.

N1 - We are specially grateful to the editor Michael Bostock, the associate Editor Greg Waite and two anonymous reviewers for their insightful comments and suggestions, which significantly improved this manuscript. IK was supported by the Russian Science Foundation (Grant 20‐17‐00075). The INVOLCAN team was supported by the projects VOLRISKMAC II (MAC2/3.5b/328) and co‐financed by the Interreg‐MAC EU program TFvolcano projects, financed by the Instituto Tecnológico y de Energías Renovables (ITER). JP and JMI were partially supported by the Spanish FEMALE project (PID2019‐106260GB‐I00) and PROOF‐FOREVER project. SA was supported by the project FWZZ‐2022.0017. We also acknowledge Rubén García‐Hernández, David Martínez van Dorth, Victor Ortega, Monika Przeor, and the countless persons who contributed to the seismic data analysis and the maintenance of the seismic network of Tenerife. Funding for open access charge: Universidad de Granada/CBUA. English language editing was performed by Tornillo Scientific, UK. Публикация для корректировки.

PY - 2023/3

Y1 - 2023/3

N2 - Volcanic activity on Tenerife Island is extremely diverse. Three radial rift zones are characterized by cinder cones from basaltic fissure eruptions. A triple junction in central Tenerife exhibits a complex of merged, predominantly phonolitic, stratovolcanoes. The Las Cañadas caldera and widespread ignimbrite deposits reveal high explosive potential. We investigated the crustal and upper mantle structure beneath Tenerife using local earthquake data recorded by two dense seismic networks on the island. For our tomographic inversion, we selected >130,000 P- and S-wave arrivals from ∼6,300 events that occurred during seismic unrests in 2004–2005 and 2017–2021. Synthetic tests confirmed that we could robustly resolve seismic velocity structures to ∼20 km depth. In the upper crust (down to ∼7 km) beneath central Tenerife, a prominent high-velocity anomaly represents the rigid core of the volcanic complex; at greater depths, a strong low-velocity anomaly reveals abrupt crustal thickening. Vp and Vs contour lines of 5.2 and 2.85 km/s, respectively, reveal Moho depth variation; crustal thickness beneath Las Cañadas reaches ∼17 km, whereas that beneath other parts of Tenerife is ∼10 km. An anomaly at ∼5 km beneath the caldera with low Vp, low Vs, and high Vp/Vs might be associated with a major phonolitic magma reservoir. Similar anomalies at ∼ sea level may represent shallow magma sources responsible for recent eruptions. Seismicity occurs in a columnar area of high Vp, high Vs, and low Vp/Vs, and may represent hydrothermal fluid migration through brittle media. Based on our results, we constructed a conceptual model of volcanic activity on Tenerife.

AB - Volcanic activity on Tenerife Island is extremely diverse. Three radial rift zones are characterized by cinder cones from basaltic fissure eruptions. A triple junction in central Tenerife exhibits a complex of merged, predominantly phonolitic, stratovolcanoes. The Las Cañadas caldera and widespread ignimbrite deposits reveal high explosive potential. We investigated the crustal and upper mantle structure beneath Tenerife using local earthquake data recorded by two dense seismic networks on the island. For our tomographic inversion, we selected >130,000 P- and S-wave arrivals from ∼6,300 events that occurred during seismic unrests in 2004–2005 and 2017–2021. Synthetic tests confirmed that we could robustly resolve seismic velocity structures to ∼20 km depth. In the upper crust (down to ∼7 km) beneath central Tenerife, a prominent high-velocity anomaly represents the rigid core of the volcanic complex; at greater depths, a strong low-velocity anomaly reveals abrupt crustal thickening. Vp and Vs contour lines of 5.2 and 2.85 km/s, respectively, reveal Moho depth variation; crustal thickness beneath Las Cañadas reaches ∼17 km, whereas that beneath other parts of Tenerife is ∼10 km. An anomaly at ∼5 km beneath the caldera with low Vp, low Vs, and high Vp/Vs might be associated with a major phonolitic magma reservoir. Similar anomalies at ∼ sea level may represent shallow magma sources responsible for recent eruptions. Seismicity occurs in a columnar area of high Vp, high Vs, and low Vp/Vs, and may represent hydrothermal fluid migration through brittle media. Based on our results, we constructed a conceptual model of volcanic activity on Tenerife.

KW - Teide

KW - Tenerife

KW - body waves

KW - crustal thickness

KW - magma reservoirs

KW - seismic tomography

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85151071287&origin=inward&txGid=9be0392c73d94020b59228e64b7a6b7c

UR - https://www.mendeley.com/catalogue/e5a4f477-a3dd-3f96-a8e7-6c1cd2e862da/

U2 - 10.1029/2022JB025798

DO - 10.1029/2022JB025798

M3 - Article

VL - 128

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 3

M1 - e2022JB025798

ER -