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Optical backbone networks carry a huge amount of bandwidth and serve as a keyenabling technology to provide telecommunication connectivity across the world.Hence, in events of network component (node/link) failures, communicationnetworks may suffer from huge amount of bandwidth loss and service disruptions.Natural disasters such as earthquakes, hurricanes, tornadoes, etc., occur atdifferent places around the world, causing severe communication servicedisruptions due to network component failures. Most of the previous works onoptical network survivability assume that the failures are going to occur infuture, and the network is made survivable to ensure connectivity in events offailures. With the advancements in seismology, the predictions of earthquakesare becoming more accurate. Earthquakes have been a major cause oftelecommunication service disruption in the past. Hence, the informationprovided by the meteorological departments and other similar agencies ofdifferent countries may be helpful in designing networks that are more robustagainst earthquakes. In this work, we consider the actual information providedby the Indian meteorological department (IMD) on seismic zones, and earthquakesoccurred in the past in India, and propose a scheme to improve thesurvivability of the existing Indian optical network through minute changes innetwork topology. Simulations show significant improvement in the networksurvivability can be achieved using the proposed scheme in events ofearthquakes.

Survivability Improvement Against Earthquakes in Backbone Optical Networks Using Actual Seismic Zone Information