Seismicity and 3-D body-wave velocity models across the Hengill geothermal area, SW Iceland ...

We image shallow crustal structures and analyze seismicity patterns in the Hengill high-enthalpy geothermal area in SW Iceland, exploiting a temporary densification of the seismic network 2018 to 2020. Using a subset of 6,300 high-quality manually picked P- and S-phases, we compute a minimum 1-D mod...

Full description

Bibliographic Details
Main Authors: Obermann, Anne, Wu, Sin-Mei, Ágústsdóttir, Thorbjörg, Duran, Alejandro, Diehl, Tobias, Sánchez Sánchez-Pastor, Maria Del Pilar, Kristjansdóttir, Sigridur, Hjörleifsdóttir, Vala, Wiemer, Stefan, Hersir, Gylfi Páll
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2022
Subjects:
induced seismicity
geothermal
tomographic imaging
b-value
velocity model
Iceland
Online Access:https://dx.doi.org/10.3929/ethz-b-000591855
http://hdl.handle.net/20.500.11850/591855
Description
Summary:We image shallow crustal structures and analyze seismicity patterns in the Hengill high-enthalpy geothermal area in SW Iceland, exploiting a temporary densification of the seismic network 2018 to 2020. Using a subset of 6,300 high-quality manually picked P- and S-phases, we compute a minimum 1-D model for the region. Our results suggest that the most consistent and accurate hypocenter locations are derived from a joint inversion of P and S arrival times for the Hengill area. We demonstrate that this minimum 1-D model in combination with SeisComP detection and location algorithms can be used to produce fully-automated yet high-quality earthquake catalogs. Our analysis established that both the induced and natural seismicity in the Hengill area occurs in several distinct, spatially constrained clusters. In production and injection areas, the depth of the clusters is at about 2 km, near the bottom of the production and injection wells. These are most likely triggered by the injection and induced by the ... : Frontiers in Earth Science, 10 ...

Similar Items