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Response analysis of a
submarine cable under fault movement
Liu Aiwen
Institute of Geophysics, China Earthquake Administration, Beijing
100081, China
Abstract: Based on the performance of submarine cables in past
earthquakes, an analytical method to determine cable performance under
seabed fault movement is proposed in this paper. First, common types of
earthquake damage to submarine cables are summarized, which include
seabed displacement induced by fault movement, submarine landslides and
seabed soil liquefaction, etc. The damage is similar to damage observed
to buried pipelines following land earthquakes. The Hengchun earthquake
of Dec. 26, 2006 is used as a case study. The M7.2 earthquake occurred
in the South China Sea at 20:26 Beijing Time, and caused 14
international submarine cables to sever and break. The results show that
the proposed method predicts damage similar to that observed in the
Hengchun earthquake. Based on parametric studies of the influence of the
water depth and the magnitude of the submarine earthquake,
countermeasures to prevent damage to submarine cables areproposed.
Keywords: submarine cable; seismic effects; fault movements
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