TY - JOUR

T1 - Structure of the magma plumbing system beneath Semisopochnoi Island (Aleutian Arc) inferred from seismic tomography

AU - Yaroshenko, Galina

AU - Koulakov, Ivan

AU - Al-Arifi, Nassir

AU - Qaysi, Saleh

AU - El Khrepy, Sami

N1 - Funding Information: We thank Jim Dixon from the Alaska Volcano Observatory, who provided us with the data for this study. The authors are grateful to the Deanship of Scientific Research, King Saud University for funding through Vice Deanship of Scientific Research Chairs. Derived products from this publication, including the P - and S -wave travel times and the full folder of the LOTOS code, that allow for the reproduction of all the results of this research are located in a file repository: Yaroshenko Galina and Koulakov Ivan (2022), “LOTOS code for local earthquake tomography with the Semisopochnoi dataset [Data set] and Scientific Reports.” Zenodo: http://doi.org/10.5281/zenodo.6203017. Publisher Copyright: © 2022, The Author(s).

PY - 2022/12

Y1 - 2022/12

N2 - Semisopochnoi Island is a remote and little-studied volcanic island in the western part of the Aleutian Arc. The existence of several active volcanic centers and a 5000–7000-year-old large caldera makes this island an important site for volcanic hazard assessment in the Northern Pacific. Based on local seismicity data recorded by six permanent seismic stations, we created the seismic tomography model, including the 3D distributions of Vp, Vs, and Vp/Vs ratios to a depth of 10 km. This model provides the first geophysical insight into the interior structure of Semisopochnoi Island and sheds light on the processes in the magma plumbing system beneath all volcanic centers on the island. At depths of 5–10 km, we observed a columnar-shaped high Vp/Vs-ratio anomaly below the caldera in the central part of the island, which likely represents the steady magma conduit. This conduit is headed by a prominent high Vp/Vs-ratio anomaly located 3–5 km directly below the caldera, which represents the magma reservoir feeding Cerberus and other Holocene-aged volcanic centers on Semisopochnoi Island.

AB - Semisopochnoi Island is a remote and little-studied volcanic island in the western part of the Aleutian Arc. The existence of several active volcanic centers and a 5000–7000-year-old large caldera makes this island an important site for volcanic hazard assessment in the Northern Pacific. Based on local seismicity data recorded by six permanent seismic stations, we created the seismic tomography model, including the 3D distributions of Vp, Vs, and Vp/Vs ratios to a depth of 10 km. This model provides the first geophysical insight into the interior structure of Semisopochnoi Island and sheds light on the processes in the magma plumbing system beneath all volcanic centers on the island. At depths of 5–10 km, we observed a columnar-shaped high Vp/Vs-ratio anomaly below the caldera in the central part of the island, which likely represents the steady magma conduit. This conduit is headed by a prominent high Vp/Vs-ratio anomaly located 3–5 km directly below the caldera, which represents the magma reservoir feeding Cerberus and other Holocene-aged volcanic centers on Semisopochnoi Island.

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UR - https://www.mendeley.com/catalogue/f8b0d8c6-8769-3b6e-ab5b-d7e35a33761a/

U2 - 10.1038/s41598-022-14794-7

DO - 10.1038/s41598-022-14794-7

M3 - Article

C2 - 35750786

AN - SCOPUS:85132850139

VL - 12

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 10771

ER -