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The present work aims at the study of dynamic pressure sensing using photonic crystal fiber (PCF) for tsunami detection. A distinguishing feature of this work is the use of a PCF sensor for tsunami detection. High-pressure sensitivity along with the negligible temperature sensitivity of the sensor makes it work in a harsh environment like the ocean bottom. First, numerical analysis for various dynamic pressure responses has been carried out and then it is followed by simulation specifically for the case of tsunamis. Results demonstrate that temperature variation in the ocean bottom has very little effect on tsunami detection. The study shows that a PCF-based sensor has the potential to be deployed in the existing tsunami detection systems with the added advantage of simple design.