Rayleigh wave phase velocity measurements across the Philippine sea from a broad-band OBS array
Rayleigh wave phase velocity measurements across the Philippine sea from a broad-band OBS array
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DOI：
10.1111/j.1365-246x.2004.02322.x
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发表时间：
2004-07-01
影响因子：
2.8
通讯作者：
Suetsugu, D
中科院分区：
文献类型：
--
作者：
Isse, T;Shiobara, H;Suetsugu, D
我们通过1999-2000年部署的长期宽带海底地震仪（LT-OBS）阵列以及日本、关岛和波纳佩群岛记录的地震图获得了西北太平洋和菲律宾北部海的基瑞利波的相速度。这次阵列观测是利用宽带地震仪长期记录海底连续地震图的首次尝试之一。 LT-OBS 站和周围陆地站的地理分布使我们能够确定马里亚纳海槽、帕雷塞维拉盆地、四国盆地和南大东盆地频率范围为 0.01 至 0.05 Hz 的纯路径相速度，这些相速度被发现系统地低于可比年龄的太平洋海底的相速度。这一结果以及菲律宾海的其他地球物理和地质观测结果可以用最上地幔相对富含铁来解释。
We obtained phase velocities of fundamental Rayleigh waves in the northwestern Pacific ocean and the northern Philippine sea from seismograms retrieved from a long-term broad-band ocean bottom seismometer (LT-OBS) array deployed in 1999-2000 and from those recorded in Japan, Guam and Ponape islands. This array observation was one of the first attempts to record continuous seismograms on the seafloor using broad-band seismographs on a long-term basis. The geographical distribution of the LT-OBS stations and the surrounding land stations enabled us to determine pure-path phase velocities in a frequency range from 0.01 to 0.05 Hz across the Mariana trough, the Parece Vela basin, the Shikoku basin and the Minami Daito basin, which were found to be systematically lower than those of the Pacific seafloor at comparable ages. This result, along with other geophysical and geological observations in the Philippine sea, may be explained by an uppermost mantle that is relatively Fe rich.