High-density seismic network for monitoring Alentejo region (Portugal) and Mitidja basin region (Algeria)
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2ND CAJG 2019
High-density seismic network for monitoring Alentejo region (Portugal) and Mitidja basin region (Algeria) Marco Manso 1
&
Mourad Bezzeghoud 2 & José Borges 2 & Bento Caldeira 2 & Abdelhakim Ayadi 3
Received: 17 May 2020 / Accepted: 2 September 2020 # Saudi Society for Geosciences 2020
Abstract The seismic sensor network Alentejo (SSN-Alentejo) brings a new approach in seismological survey based on networked lowcost sensors and acquisition systems. It is developed by the Earth Sciences Institute (Instituto de Ciências da Terra, University of Evora) to bring the most dense seismic sensor network ever deployed in Portugal. By combining high-sensitive sensors with lowcost sensors, this novel network aims to improve the characterisation of seismic activity in the region, by augmenting existing sensing and monitoring capabilities, enabling the opportunity to observe, for the first time in Portuguese territory, real-time monitoring of the seismic activity in high resolution. In this study, we start by describing the seismicity along the occidental border between the Eurasian-Nubian plates, including the two regions of our interest: the Arraiolos region, in Portugal, and the Mitidja basin, in Algeria. We then present our work in designing and implementing a high-density sensor network, including low-cost sensor systems and server platforms. The conducted tests have proven the feasibility of the overall platform, including its detectability capability. Future work includes the deployment of the sensor network in the Alentejo region. Since seismogenic zones such as the Mitidja or Chelif basins in Algeria will also benefit from having a high-density network, we will also seek collaboration with Algerian institutions. Keywords High-density seismic network . Seismic sensors . MEMS . Accelerometers . Seismology
Introduction Seismic events can be extreme and severe threats to humanity, causing a heavy death toll, serious destruction and damage. Being no exception, the Iberian Peninsula and the North of Africa—part of the Ibero-Maghrebian region between the Gulf of Cadiz and Algeria—share the Eurasian-Nubian plate boundary that corresponds to a well-defined narrow band of This paper was selected from the 2nd Conference of the Arabian Journal of Geosciences (CAJG), Tunisia 2019 Responsible Editor: Abd El-aziz Khairy Abd El-aal * Marco Manso [email protected] 1
Instituto de Ciências da Terra, Universidade de Évora, Evora, Portugal
2
Departamento de Física (ECT), Instituto de Ciências da Terra (IIFA), Universidade de Évora, Evora, Portugal
3
Centre de Recherche en Astronomie Astrophysique et Géophysique, Algiers, Algeria
seismicity, where large earthquakes occur (Ousadou and Bezzeghoud 2019). Helping to understand these phenomena, seismic networks have been deployed in increasing number, filling in the gaps in the global coverage and improving our understanding of the physical processes that cause earthquakes. Portugal, in particular, has made a significant effort to develop the Broadband Portuguese seism
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