A broadband magnetotelluric survey for Mt. Meakandake volcano with special attention to the unrest during 2016–2017
نویسندگان
چکیده
Abstract We performed a broadband magnetotelluric (BBMT) survey and three-dimensional resistivity modeling for the Meakandake volcano in eastern Hokkaido, Japan, where remarkable ground deformation suggests sill-like intrusion on northeastern flank from 2016 to 2017. The remained unerupted, therefore volcanological meaning of was unclear, making evaluation “unrest” event difficult. Our 3D MT model has revealed subvertical low-resistivity column C1 (approximately 1–10 Ωm) extending 0.5 km BSL (below sea level) deeper part Mt. Meakandake. conductor not right presumed sill but just beneath summit craters offset southwest. sensitivity test which bottom limit varied, confirmed that meaningful down approximately 30 BSL. vertical reach depth necessary reproduce impedance phases out quadrant at some sites west In addition, we interpreted uppermost probably connected active vents through pathways heat fluids, corresponding alignment microearthquakes. On other hand, found no conductivity anomalies flank, inflation source presumed. While our data do suggest thin depth, it does exclude possibility been caused by lateral magmatic or hydrothermal branched certain C1. Graphical
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ژورنال
عنوان ژورنال: Earth, Planets and Space
سال: 2022
ISSN: ['1880-5981', '1343-8832']
DOI: https://doi.org/10.1186/s40623-022-01673-8