2026-03-12T11:51:08Z https://kanazawa-u.repo.nii.ac.jp/oai

oai:kanazawa-u.repo.nii.ac.jp:00010714 2024-06-20T06:08:04Z 934:935:937

Spatial variation in coda Q around the Nobi fault zone, central Japan: Relation to S-wave velocity and seismicity 平松, 良浩 Tsuji, Sugane 80283092 Hiramatsu, Yoshihiro We investigate the spatial variation in coda Q around the Nobi fault zone in a high strain rate zone to assess the relation between coda Q, shear wave velocity, and seismicity. Waveform data were obtained from dense seismic observations. Low coda Q that follows the Niigata-Kobe Tectonic Zone in the high strain rate zone is distinct at the lowest frequency band of 1 to 2∈Hz. However, at higher frequencies, such a spatial pattern in coda Q is unclear. A good positive correlation was found between coda Q at the 1- to 2-Hz frequency band and the S-wave velocity perturbation at 25-km depth, which suggests that the coda Q reflects the ductile deformation below the brittle-ductile transition zone. Furthermore, coda Q at the 1- to 2-Hz frequency band correlates negatively with seismicity at 10- to 15-km depth, which implies that there is a high stressing rate in the low coda Q area. These facts, together with results of previous studies, imply that a high deformation rate below the brittle-ductile transition zone produces the high strain rate observed by the Global Positioning System (GPS) on the surface in this region. Springer 2014-12-01 2017-10-03 eng journal article AM https://doi.org/10.24517/00010701 http://hdl.handle.net/2297/40599 https://kanazawa-u.repo.nii.ac.jp/records/10714 10.24517/00010701 10.1186/1880-5981-66-97 AA11211921 1343-8832 Earth, Planets and Space 66 1 97 https://kanazawa-u.repo.nii.ac.jp/record/10714/files/SC-PR-HIRAMATSU-Y-97.pdf application/pdf 921.0 kB 2017-10-03