Persistent Long‐Period Signals Recorded by an OBS Array in the Western‐Central Pacific: Activity of Ambrym Volcano in Vanuatu
Persistent Long‐Period Signals Recorded by an OBS Array in the Western‐Central Pacific: Activity of Ambrym Volcano in Vanuatu
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DOI：
10.1029/2020gl089108
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发表时间：
2020-09
影响因子：
5.2
通讯作者：
Y. Kawano;T. Isse;A. Takeo;H. Kawakatsu;D. Suetsugu;H. Shiobara;H. Sugioka;A. Ito;Y. Ishihara;S. Tanaka;M. Obayashi;T. Tonegawa;J. Yoshimitsu
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作者：
Y. Kawano;T. Isse;A. Takeo;H. Kawakatsu;D. Suetsugu;H. Shiobara;H. Sugioka;A. Ito;Y. Ishihara;S. Tanaka;M. Obayashi;T. Tonegawa;J. Yoshimitsu
太平洋中西部海底地震仪阵列记录的环境噪声互相关函数中出现了周期约为25和18 s的强长周期地震信号。信号幅度随时间变化，并且信号的视在传播时间通常小于对于沿沿着连接站对的大圆传播的瑞利波所预期的那些视在传播时间。根据互相关函数，信号源位于瓦努阿图弧。当地数据分析表明，信号来自两个不同的来源，可能位于安布里姆火山活动锥下海平面以下约0-1公里的深度。
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.