2026-03-13T05:56:51Z https://kanazawa-u.repo.nii.ac.jp/oai

oai:kanazawa-u.repo.nii.ac.jp:00047462 2024-06-20T06:09:24Z 934:935:937

Characteristics of non-tectonic tremors around the Lützow-Holm Bay, East Antarctica, during 2013–2015 平松, 良浩 Tanaka, Yuya 80283092 Hiramatsu, Yoshihiro Ishihara, Yoshiaki 40233845 Kanao, Masaki Characteristics of non-tectonic tremors, excited mainly by the interaction within the cryosphere, were investigated using seismic waveform data of 2013–2015 recorded at broadband stations on the east coast of the Lützow-Holm Bay (LHB), East Antarctica. The tremors were classified into three types by spectral and waveform features. Type A events have long durations, typically several hours to days, with high amplitudes of spectra over 1–8 Hz. They occur dominantly in austral summers. Type B events have characteristically irregular variations in discrete dominant frequencies in spectra. Type C events are harmonic tremors with discrete dominant frequencies in spectra that vary regularly with time. Type B and C events show similar seasonal variations: they are numerous around April and less so in austral winter. Comparison of spectra between seismic waves and infrasound, together with satellite images, suggests that type A events originated from storm-induced swells near off-LHB. Source locations of type C events and satellite images suggest that type C events are likely to result from the collision/crevassing of ice blocks in fast-sea-ice in LHB. Similar seasonal variations of type B and C events imply that these two events have similar origins. Embargo Period 24 months 金沢大学理工研究域地球社会基盤学系 Elsevier 2019-03-01 2019-03-18 eng journal article AM https://doi.org/10.24517/00053789 http://hdl.handle.net/2297/00053789 https://kanazawa-u.repo.nii.ac.jp/records/47462 10.24517/00053789 10.1016/j.polar.2018.11.010 http://www.elsevier.com/locate/issn/18739652 http://www.elsevier.com/locate/issn/18739652 AA12240481 1873-9652 Polar Science 19 77 85 https://kanazawa-u.repo.nii.ac.jp/record/47462/files/SC-PR-HIRAMATSU-Y-77.pdf application/pdf 4.7 MB 2021-04-01