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Persistent Long‐Period Signals Recorded by an OBS Array in the Western‐Central Pacific: Activity of Ambrym Volcano in Vanuatu
Author(s) -
Kawano Yuki,
Isse Takehi,
Takeo Akiko,
Kawakatsu Hitoshi,
Suetsugu Daisuke,
Shiobara Hajime,
Sugioka Hiroko,
Ito Aki,
Ishihara Yasushi,
Tanaka Satoru,
Obayashi Masayuki,
Tonegawa Takashi,
Yoshimitsu Junko
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl089108
Subject(s) - geology , seismometer , seismology , volcano , amplitude , period (music) , geodesy , acoustics , physics , quantum mechanics
Strong long‐period seismic signals at periods around 25 and 18 s appear in the ambient noise cross‐correlation functions recorded by an array of ocean bottom seismometers (OBSs) in the western‐central Pacific. The signal amplitude varies from time to time, and the apparent travel times of the signals are typically smaller than those expected for the Rayleigh waves propagating along the great circle connecting the station pairs. From the cross‐correlation functions, the signal sources are located in the Vanuatu Arc. Local data analysis suggests the signals originate from two different sources possibly located at depths of ~0–1 km below the sea level beneath the active cones of Ambrym volcano.