Imaging crustal structures through a passive seismic imaging approach in a mining area in Saxony, Germany
<p>We have used several flooding-induced microseismic events that occurred in an abandoned mining area to image geological structures close to the hypocentres in the vicinity of the mine. The events have been located using a migration-based localization approach. We used the recorded full wave...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9726c10443214ab7940286769f114e6a |
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| Sumario: | <p>We have used several flooding-induced microseismic events
that occurred in an abandoned mining area to image geological structures
close to the hypocentres in the vicinity of the mine. The events have been
located using a migration-based localization approach. We used the recorded
full waveforms of these localized microseismic events and have processed
these passive source data as if they resulted from active sources at the
known hypocentre location and origin time defined by the applied location
approach. The imaging was then performed using a focusing 3D prestack
depth migration approach for the secondary P-wave arrivals. The needed 3D
migration velocity model was taken from a recent 3D active
(controlled-source) seismic survey in that area. We observed several clear
and pronounced reflectors in our obtained 3D seismic image cube, some of
them related to a major fault zone in that area and some correlating well
with information from the nearby mining activities. We compared our results
to the 3D seismic image cube obtained directly from the 3D active seismic
survey and have found new structures with our approach that were not known
yet, probably because of their steep dips which the 3D active seismic survey
had not illuminated. The location of the hypocentres at depth with respect
to the illumination angles of those structures proved to be favourable in
that case, and our 3D passive image complements the 3D active seismic image
in an elegant way, thereby revealing new structures that cannot be imaged
otherwise with surface seismic configurations alone.</p> |
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