Short Communication

Comparison of seismic records obtained by distributed acoustic sensing and ocean bottom seismometers

¹ INESC TEC – Institute for Systems and Computer Engineering, Technology and Science, Rua do Campo Alegre, 687, 4150-179 Porto, Portugal
² Instituto Dom Luiz, University of Lisbon, 1749-016 Lisbon, Portugal
³ Agência Regional para o Desenvolvimento da Investigação, Tecnologia e Inovação, Funchal, Portugal
⁴ Instituto de Óptica “Daza de Valdés” IO-CSIC, C/Serrano 121, 28006 Madrid, Spain
⁵ Instituto Português do Mar e da Atmosfera, Rua C ao aeroporto, 1749-077 Lisbon, Portugal
⁶ IT Instituto de Telecomunicações Lisboa, Campus Alameda, Torre Norte - Piso 10, Av. Rovisco Pais, 1, 1049 - 001 Lisboa, Portugal
⁷ ISEL Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 3 December 2025
Accepted: 23 January 2026

Abstract

This work presents an experimental framework for offshore seismic monitoring that combines Distributed Acoustic Sensing (DAS) with ocean-bottom seismometers (OBS). The study was conducted in the Azores region – Faial, where an HDAS interrogator prototype was connected to dark fiber submarine fiber-optic cable, complemented by the installation of two Ocean Bottom Seismometers (OBS) for calibration and validation of DAS technology. The main objective is to demonstrate that seismic observations obtained by DAS from seafloor cables can provide essential information similar to OBS and particularly in areas where land-based monitoring stations are limited.