Abstract
AbstractSparse seismic instrumentation in the oceans limits our understanding of deep Earth dynamics and submarine earthquakes. Distributed acoustic sensing (DAS), an emerging technology that converts optical fiber to seismic sensors, allows us to leverage pre-existing submarine telecommunication cables for seismic monitoring. Here we report observations of microseism, local surface gravity waves, and a teleseismic earthquake along a 4192-sensor ocean-bottom DAS array offshore Belgium. We observe in-situ how opposing groups of ocean surface gravity waves generate double-frequency seismic Scholte waves, as described by the Longuet-Higgins theory of microseism generation. We also extract P- and S-wave phases from the 2018-08-19$${M}_{w}8.2$$Mw8.2Fiji deep earthquake in the 0.01-1 Hz frequency band, though waveform fidelity is low at high frequencies. These results suggest significant potential of DAS in next-generation submarine seismic networks.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
Reference74 articles.
1. Lay, T. et al. Seismological Grand Challenges in Understanding Earth’s Dynamic Systems. Report to the National Science Foundation (IRIS Consortium, 2009).
2. McGuire, J. J. et al. The SZ4D Initiative: Understanding the Processes that Underlie Subduction Zone Hazards in 4D. Vision Document Submitted to the National Science Foundation (IRIS Consortium, 2017).
3. Suetsugu, D. & Shiobara, H. Broadband ocean-bottom seismology. Annu. Rev. Earth Planet. Sci. 42, 27–43 (2014).
4. Forsyth, D. W., Webb, S. C., Dorman, L. M. & Shen, Y. Phase velocities of rayleigh waves in the melt experiment on the east pacific rise. Science 280, 1235–1238 (1998).
5. Toomey, D. R., Wilcock, W. S. D., Solomon, S. C., Hammond, W. C. & Orcutt, J. A. Mantle seismic structure beneath the melt region of the east pacific rise from p and s wave tomography. Science 280, 1224–1227 (1998).
Cited by
239 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献