Near-Surface Characterization Using Distributed Acoustic Sensing and Ambient Seismic Noise in an Urban Area: Granada, Spain.
Description:
The Granada Basin in the southeast of Spain is an area of moderate seismicity. Yet, it presents some of the highest seismic hazards with a soft sedimentary layer amplifying local ground motion in the Iberian Peninsula. In urban areas, ground motion measurements often suffer from sparse instrumentation. An enticing alternative to conventional seismometers is the novel Distributed Acoustic Sensing (DAS) technology that can convert telecommunication fiber-optic cables into dense arrays of seismic sensors. In this study, a field test of DAS array is conducted in Granada city on 26 and 27 Aug 2020 using a telecommunication fiber. We utilize the dataset to extract surface wave information from ambient seismic field (ASF) and obtain nine shear-wave velocity (Vs) profiles under different sections of the cable. The shallow Vs structure shows a good agreement with the geological conditions of different soil deposits. This study demonstrates that ASF monitoring using DAS could provide insights into soil characterization and seismic microzonation in urban areas, which helps to understand local site response to ground motion.
Session: Understanding Earth Systems with Fiber-optic Cables
Type: Oral
Date: 4/19/2023
Presentation Time: 11:15 AM (local time)
Presenting Author: Yang Li
Student Presenter: Yes
Invited Presentation:
Authors
Yang Li Presenting Author Corresponding Author yangyli@umich.edu University of Michigan |
Zack Spica zspica@umich.edu University of Michigan |
Mathieu Perton mathieu.perton@gmail.com Universidad Nacional Autonoma de Mexico |
Beatriz Gaite bgaite@mitma.es National Geographic Institute of Spain |
Sandra Ruiz-Barajas srbarajas@fomento.es National Geographic Institute of Spain |
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Near-Surface Characterization Using Distributed Acoustic Sensing and Ambient Seismic Noise in an Urban Area: Granada, Spain.
Category
Understanding Earth Systems with Fiber-optic Cables